Cape Town – The earthquake that shook Germiston and surrounding areas in the early hours of Wednesday morning was likely related to mining practices, according to a local seismology expert.
Michelle Grobbelaar, manager of the seismology unit at the Council for Geoscience, could not confirm with 100% certainty that it was mining-related, but said that it was “likely”.
“It is likely related to abandoned mines. In the past, with much mining activity, tremors occurred more regularly,” she told News24.
Grobbelaar described "water ingress" as a highly probable scenario where the natural water table fills up.
“When water comes into rocks it lubricates the joints causing fractures to slip thereby causing earthquakes,” she said.
According to Grobbelaar the public may be at risk if the ground movement affects buildings.
“In seismology, intensity scale depends on the quality or construction of the building... one can get destruction at a small magnitude,”she added.
Research is being carried out in an attempt to stabilise water movement.
At the surface level micro-zonation studies seeks to identify areas where damage would be the worst and thereafter informing disaster risk management efforts.
The public will be encouraged to complete an online questionnaire which will help seismologists get an accurate location of the earthquake’s epicentre.
The earthquake measured 3.4 on a local magnitude scale, which is equivalent to the Californian Richter scale.
- News24
Showing posts with label Earthquakes South Africa. Show all posts
Showing posts with label Earthquakes South Africa. Show all posts
Thursday, 28 February 2013
Thanks and Appreciation: Earthquake felt in parts of Gauteng (27 February 2013 00h31 SAST)
SAWDOS would like to thank each and everyone who send in reports of the earthquake felt in parts of Gauteng on the 27 February 2013. We received an overwhelming response with close to 200 reports. The information received will be analyzed and then archived for record purposes. As to date there are still no indication what caused the earthquake. Despite the lack of seismic information from Geoscience it is imperative that every tremor in South Africa must be reported.
SAWDOS would like to establish if there is any interest in the formation of the South African Public Seismic Network.
Suggestions and comments are most welcome and can be send to the SAWDIS by clicking HERE.
To all those who monitors Earthquakes in South Africa, keep up the good work and continue to inform SAWDOS of tremor events. Keep Safe!!
- SAWDOS
SAWDOS would like to establish if there is any interest in the formation of the South African Public Seismic Network.
Suggestions and comments are most welcome and can be send to the SAWDIS by clicking HERE.
To all those who monitors Earthquakes in South Africa, keep up the good work and continue to inform SAWDOS of tremor events. Keep Safe!!
- SAWDOS
Wednesday, 27 February 2013
Update: Earthquake felt in parts of Gauteng (27 February 2013 00h31 SAST)
Image: Google Maps
Henri Steppe: At what strength does a tremor become a quake?
SAWDOS - An earthquake (also known as a quake, tremor or temblor) is the result of a sudden release of energy in the Earth's crust that creates seismic waves. Once measured on the Richter scale it is classified as and earthquake. The Richter magnitude scale (often shortened to Richter scale) was developed to assign a single number to quantify the energy released during an earthquake. Earthquakes descriptions are: Micro - Less than 2.0M, Minor - 2.0 to 3.9M, Light - 4.0 to 4.9M, Moderate - 5 - 5.0M, Strong - 6.0 - 6.9M, Major - 7.0 - 7.9M, Great - 8.0 - 9.9M and Massive - 10 or Over. Last night's earthquake is classified as Minor (2.9 to 3.9M)The earth tremor last night felt in parts of Gauteng measured 3.4M on the Richter scale. Having said that one never knows when the big one will strike.
Request for information: Tremor Gauteng (27 February 2013)
SAWDOS request people that felt the tremor in the Gauteng area last night, to send information about the tremor to the SAWDOS.
The following information is needed. Please complete what you experienced and observed during the tremor.
1. Name:
2. Town or area:
3. Province:
4. Date of earthquake:
5. Time of earthquake:
6. If available, in which area was the earthquake felt:
7. Where were you when the earthquake occurred:
8. Did you feel any vibrations or shaking:
9. Did you hear anything and if so what did you hear:
10. Did any door or window rattle or anything else:
11. Were you indoors or outdoors at the time:
12. Was there any damage (If yes, please provide detail):
13. General Observations or comments:
14. Is this the first time you felt a tremor in the area:
Send information to the SAWDIS by clicking HERE.
Please do not stop reporting tremors or earthquakes as the SAWDIS is now your only free source of earthquake information based upon reports from the public. Keep those reports coming!!
The following information is needed. Please complete what you experienced and observed during the tremor.
1. Name:
2. Town or area:
3. Province:
4. Date of earthquake:
5. Time of earthquake:
6. If available, in which area was the earthquake felt:
7. Where were you when the earthquake occurred:
8. Did you feel any vibrations or shaking:
9. Did you hear anything and if so what did you hear:
10. Did any door or window rattle or anything else:
11. Were you indoors or outdoors at the time:
12. Was there any damage (If yes, please provide detail):
13. General Observations or comments:
14. Is this the first time you felt a tremor in the area:
Send information to the SAWDIS by clicking HERE.
Please do not stop reporting tremors or earthquakes as the SAWDIS is now your only free source of earthquake information based upon reports from the public. Keep those reports coming!!
Earthquake in Boksburg (Johannesburg), South Africa
South Africa has often weak to moderate earthquakes but we have a hard time to retrieve data from it. International agencies are not reporting the data but people are mentioning what they have felt in our site.
The site of http://www.geoscience.org.za/ is dead since a long time and even the proposed links are not working or are overdue too. A pity. A population should be informed swiftly about earthquakes.
- Earthquake Report
SAWDOS - Now this is what the SAWDOS has been talking about all along. No free information on earthquakes in South Africa. Rather working together Geoscience has opted to go the subscription route. Thanks to the U.S. Geological Survey (USGS), amateur sceismic observers and SAWDOS social media South Africans can still get earthquake information free of charge. This is really crazy but unfortunately the current situation in South Africa.
The site of http://www.geoscience.org.za/ is dead since a long time and even the proposed links are not working or are overdue too. A pity. A population should be informed swiftly about earthquakes.
- Earthquake Report
SAWDOS - Now this is what the SAWDOS has been talking about all along. No free information on earthquakes in South Africa. Rather working together Geoscience has opted to go the subscription route. Thanks to the U.S. Geological Survey (USGS), amateur sceismic observers and SAWDOS social media South Africans can still get earthquake information free of charge. This is really crazy but unfortunately the current situation in South Africa.
A big earthquake expected in South Africa?
Images: USGS (Click for larger view.)
Anonymous writes: I am just curious to know. I live in Witfield, Boksburg in Gauteng. Last night we experienced an earthquake that was really intense. This is the second one in two years. I have lived there all my life and have never felt them so strong, thus I can't believe that it's due to the mines in the area. It lasted for about 5 seconds and was so strong that I could see my house make like a wave almost. Just want to know if someone else felt it and what it measured on the Richter scale. Should we be concerned?
SAWDIS - There is no "Earthquake Proof" areas on Earth. Yes, there is always the possibility of a large and destructive earthquake in South Africa.
An earthquake is caused by fault lines releasing energy under the earth's surface. Fault lines are found in the boundaries of two or more tectonic plates.
South Africa, and the rest of Africa, sits inside the African Plate. The closest big fault lines to South Africa is created by the African Plate and Antarctic Plate which is far down in the Southern Ocean. We should take precautions and be ready when an earthquake strike and lets not forget about the threat of a Tsunami should a large earthquake occur in the Southern Ocean.
The Earth will move whether we like it or not. Minor and small fault lines could also be created away from the main fault lines. In 1969 Tulbagh in the Western Cape experienced a devastating earthquake. So there is definitely bound to be another devastating earthquake in South Africa. It is just a question of where and when. Nobody really knows as earthquakes currently cannot be predicted.
It is not known whether this tremor is a pre-shock to a major earthquake. Earthquakes fall into 3 categories. Some have fore-shocks, some show subtle signs, and others have aftershocks. Earthquakes are still not predictable. Some have no warning at all and never show any signs of happening. The third group follow no pattern at all, they go seemingly randomly, and they can not even be estimated. It is very hard to tell which fault will be in which group, and this is why prediction is still impossible. The designation of an earthquake as fore-shock, main-shock or after-shock is therefor only possible after the main event.
Up to now the cause of last night's tremor is still unknown (possibly mine related?) but the SAWDOS would like to advise members of the public to report any further seismic activity to the SAWDOS.
SAWDOS would like to take this opportunity to thank all earthquake observers who send in reports to the SAWDOS . Despite the lack of Richterscale and other seismic information from Geoscience it is imperative that every tremor in South Africa must be reported. To all those who monitors Earthquakes in South Africa, keep up the good work and continue to inform SAWDOS of tremor events. Keep Safe!!
- SAWDOS
What to Do During an Earthquake
Stay as safe as possible during an earthquake. Be aware that some
earthquakes are actually foreshocks and a larger earthquake might occur.
Minimize your movements to a few steps to a nearby safe place and if
you are indoors, stay there until the shaking has stopped and you are
sure exiting is safe.
If indoors
DROP to the ground; take COVER by getting under a sturdy table or other piece of furniture; and HOLD ON until the shaking stops. If there isn’t a table or desk near you, cover your face and head with your arms and crouch in an inside corner of the building.
Stay away from glass, windows, outside doors and walls, and anything that could fall, such as lighting fixtures or furniture.
Stay in bed if you are there when the earthquake strikes. Hold on and protect your head with a pillow, unless you are under a heavy light fixture that could fall. In that case, move to the nearest safe place.
Use a doorway for shelter only if it is in close proximity to you and if you know it is a strongly supported, loadbearing doorway.
Stay inside until the shaking stops and it is safe to go outside. Research has shown that most injuries occur when people inside buildings attempt to move to a different location inside the building or try to leave.
Be aware that the electricity may go out or the sprinkler systems or fire alarms may turn on.
DO NOT use the elevators.
If outdoors
Stay there.
Move away from buildings, streetlights, and utility wires.
Once in the open, stay there until the shaking stops. The greatest danger exists directly outside buildings, at exits and alongside exterior walls. Many of the 120 fatalities from the 1933 Long Beach earthquake occurred when people ran outside of buildings only to be killed by falling debris from collapsing walls. Ground movement during an earthquake is seldom the direct cause of death or injury. Most earthquake-related casualties result from collapsing walls, flying glass, and falling objects.
If in a moving vehicle
Stop as quickly as safety permits and stay in the vehicle. Avoid stopping near or under buildings, trees, overpasses, and utility wires.
Proceed cautiously once the earthquake has stopped. Avoid roads, bridges, or ramps that might have been damaged by the earthquake.
If trapped under debris
Do not light a match.
Do not move about or kick up dust.
Cover your mouth with a handkerchief or clothing.
Tap on a pipe or wall so rescuers can locate you. Use a whistle if one is available. Shout only as a last resort. Shouting can cause you to inhale dangerous amounts of dust.
- FEMA
If indoors
DROP to the ground; take COVER by getting under a sturdy table or other piece of furniture; and HOLD ON until the shaking stops. If there isn’t a table or desk near you, cover your face and head with your arms and crouch in an inside corner of the building.
Stay away from glass, windows, outside doors and walls, and anything that could fall, such as lighting fixtures or furniture.
Stay in bed if you are there when the earthquake strikes. Hold on and protect your head with a pillow, unless you are under a heavy light fixture that could fall. In that case, move to the nearest safe place.
Use a doorway for shelter only if it is in close proximity to you and if you know it is a strongly supported, loadbearing doorway.
Stay inside until the shaking stops and it is safe to go outside. Research has shown that most injuries occur when people inside buildings attempt to move to a different location inside the building or try to leave.
Be aware that the electricity may go out or the sprinkler systems or fire alarms may turn on.
DO NOT use the elevators.
If outdoors
Stay there.
Move away from buildings, streetlights, and utility wires.
Once in the open, stay there until the shaking stops. The greatest danger exists directly outside buildings, at exits and alongside exterior walls. Many of the 120 fatalities from the 1933 Long Beach earthquake occurred when people ran outside of buildings only to be killed by falling debris from collapsing walls. Ground movement during an earthquake is seldom the direct cause of death or injury. Most earthquake-related casualties result from collapsing walls, flying glass, and falling objects.
If in a moving vehicle
Stop as quickly as safety permits and stay in the vehicle. Avoid stopping near or under buildings, trees, overpasses, and utility wires.
Proceed cautiously once the earthquake has stopped. Avoid roads, bridges, or ramps that might have been damaged by the earthquake.
If trapped under debris
Do not light a match.
Do not move about or kick up dust.
Cover your mouth with a handkerchief or clothing.
Tap on a pipe or wall so rescuers can locate you. Use a whistle if one is available. Shout only as a last resort. Shouting can cause you to inhale dangerous amounts of dust.
- FEMA
Earth Tremor felt in parts of Gauteng (27 February 2013 00h31 SAST)
A large earth tremor was felt last night in many areas or Gauteng. The SAWDOS was alerted of the incident via Twitter at. It is not known at this stage whether this tremor was a mine related incident. The SAWDOS trust that the Council for Geoscience will release further info on the earth tremor. No reports of damage or injuries were received up to now.
TheVenomNib @SAWDOS1 earthquake apps not showing any seismic activity above 1 on Richter scale fo r job area . 3 hours ago · reply · retweet · favorite
NazliHamilton @SAWDOS1 Felt a tremor in Ridgeway, JHB South. It lasted quite long. Scary! 7 hours ago · reply · retweet · favorite
Sam_Bhikraj @ruby_clipper @ToxxiCat @SAWDOS1 Felt it in Linmeyer too. Freaked me out...Felt the whole building move! 7 hours ago · reply · retweet · favorite
GUNS1401 @SAWDOS1 still can't get back to sleep after the earth tremor felt in Linden at 0030B27022013. Sounded and felt like a (long) truck crash 7 hours ago · reply · retweet · favorite
RiekieE @SimoneGorven @SAWDOS1 @atlasville #Tremor I felt it in Wilropark Roodepoort 7 hours ago · reply · retweet · favorite
ValTheGranny @sawdos1 Tremor felt in Solheim just above Bedfordview aprox. 12.30 my bed bounced up and down I got such a fright 7 hours ago · reply · retweet · favorite
Alimano123 @SAWDOS1 felt it here in Riverlea as well. 7 hours ago · reply · retweet · favorite
REVOLP @SAWDOS1 gautrain is sleeping right. #NoAccident 8 hours ago · reply · retweet · favorite
SimoneGorven @SAWDOS1 felt the #Tremor in @atlasville shortly after 12:30am. Thought someone was breaking in! 8 hours ago · reply · retweet · favorite
HollidayTarryn @SAWDOS1 how can that be felt all the way here near Midrand and Centurion? Mine related? Is that possible? 8 hours ago · reply · retweet · favorite
BurgerGVN @SAWDOS1 Earth Tremor felt at +/- 00H25. Windows, Doors and Walls, rattle and rumble for about 10 seconds I think. #GVNBURGER 8 hours ago · reply · retweet · favorite
RiAiDi @SAWDOS1 We are very close too Fourways/Crowthorne area and I definitely felt very light tremor and heard the rumbling noise!Any other?? 8 hours ago · reply · retweet · favorite
TigerMunky @PietmanKahl @sawdos1 Jozi central too, I wonder if it reached the South? 8 hours ago · reply · retweet · favorite
HollidayTarryn Slight earth tremor here in Carlswald Midrand at +- 00h35! Thought I was imagining things! @SAWDOS1 8 hours ago · reply · retweet · favorite
SAWDOS1 To early to tell the exact cause of the tremor. Most likely mine related. 8 hours ago · reply · retweet · favorite
JoyRecruitRite "@FamilySmiths: @SAWDOS1 felt that earth tremor in sunnyridge too, hectic" ◄ and in Orange Grove. 8 hours ago · reply · retweet · favorite
RiAiDi @SAWDOS1 You could actually hear it too!! 8 hours ago · reply · retweet · favorite
0690RGG @ruby_clipper @sawdos1 i felt it too 8 hours ago · reply · retweet · favorite
warrenegates "@moe_omarjee: Hectic Earth Tremor In Auckland Park,Rattled doors windows with Loud Rumble.What's the cause?@SAWDOS1" felt in Alberton too. 8 hours ago · reply · retweet · favorite
PietmanKahl .@PietmanKahl @SAWDOS1 how wide spread was it? #atlasville in East to #aucklandpark in the west! #tremor 8 hours ago · reply · retweet · favorite
atlasville @sawdos1 That earth tremor has not affected OR Tambo. Planes taking off. #Tremor felt right across Jhb from east to west and south. 8 hours ago · reply · retweet · favorite
FamilySmiths @SAWDOS1 felt that earth tremor in sunnyridge too, hectic 8 hours ago · reply · retweet · favorite
HollidayTarryn "@atlasville: Earth tremor in#Atlasville Wed, Feb 27, 2013 00:31:12. Woke up the birds! @sawdos1" @Trevornoah 8 hours ago · reply · retweet · favorite
kwbjhb @SAWDOS1 earth tremor roodepoort at 00h30 about 20secs 8 hours ago · reply · retweet · favorite
sumptiousbitch1 @mwmoz @SAWDOS1 @Trevornoah @atlasville I'm in edenvale felt it to whole house. windows shook 8 hours ago · reply · retweet · favorite
RiAiDi @SAWDOS1 Felt a light tremor in Centurion, Monavoni!! Wow! Scary! 8 hours ago · reply · retweet · favorite
smanjoo "@moe_omarjee: Hectic Earth Tremor In Auckland Park,Rattled doors windows with Loud Rumble.What's the cause?"@SAWDOS1 8 hours ago · reply · retweet · favorite
trustfreetks @atlasville @sawdos1 now they really shouting! Wonder wot they know next ! It was rather a cracking one #yikes! 8 hours ago · reply · retweet · favorite
moe_omarjee Hectic Earth Tremor In Auckland Park,Rattled doors windows with Loud Rumble.What's the cause?@SAWDOS1 8 hours ago · reply · retweet · favorite
ParwezLidimo @SAWDOS1 00:25 Benoni Earth tremor , bed shaking and windows rattling . Ricter scale? 8 hours ago · reply · retweet · favorite
mwmoz @Trevornoah did you feel it too? I'm in boksburg, @atlasville mentioned it too @SAWDOS1 8 hours ago · reply · retweet · favorite
mwmoz @SAWDOS1 nice earth tremor in atlasville, boksburg a few seconds ago! 8 hours ago · reply · retweet · favorite
ruby_clipper Earth tremor, quite strong, shaking windows, doors, security gates etc for about 20secs in Glenvista JHB 00H31 @SAWDOS1 8 hours ago · reply · retweet · favorite
atlasville Earth tremor in#Atlasville Wed, Feb 27, 2013 00:31:12. Woke up the birds! @sawdos1 8 hours ago · reply · retweet · favorite
TheVenomNib @SAWDOS1 earthquake apps not showing any seismic activity above 1 on Richter scale fo r job area . 3 hours ago · reply · retweet · favorite
NazliHamilton @SAWDOS1 Felt a tremor in Ridgeway, JHB South. It lasted quite long. Scary! 7 hours ago · reply · retweet · favorite
Sam_Bhikraj @ruby_clipper @ToxxiCat @SAWDOS1 Felt it in Linmeyer too. Freaked me out...Felt the whole building move! 7 hours ago · reply · retweet · favorite
GUNS1401 @SAWDOS1 still can't get back to sleep after the earth tremor felt in Linden at 0030B27022013. Sounded and felt like a (long) truck crash 7 hours ago · reply · retweet · favorite
RiekieE @SimoneGorven @SAWDOS1 @atlasville #Tremor I felt it in Wilropark Roodepoort 7 hours ago · reply · retweet · favorite
ValTheGranny @sawdos1 Tremor felt in Solheim just above Bedfordview aprox. 12.30 my bed bounced up and down I got such a fright 7 hours ago · reply · retweet · favorite
Alimano123 @SAWDOS1 felt it here in Riverlea as well. 7 hours ago · reply · retweet · favorite
REVOLP @SAWDOS1 gautrain is sleeping right. #NoAccident 8 hours ago · reply · retweet · favorite
SimoneGorven @SAWDOS1 felt the #Tremor in @atlasville shortly after 12:30am. Thought someone was breaking in! 8 hours ago · reply · retweet · favorite
HollidayTarryn @SAWDOS1 how can that be felt all the way here near Midrand and Centurion? Mine related? Is that possible? 8 hours ago · reply · retweet · favorite
BurgerGVN @SAWDOS1 Earth Tremor felt at +/- 00H25. Windows, Doors and Walls, rattle and rumble for about 10 seconds I think. #GVNBURGER 8 hours ago · reply · retweet · favorite
RiAiDi @SAWDOS1 We are very close too Fourways/Crowthorne area and I definitely felt very light tremor and heard the rumbling noise!Any other?? 8 hours ago · reply · retweet · favorite
TigerMunky @PietmanKahl @sawdos1 Jozi central too, I wonder if it reached the South? 8 hours ago · reply · retweet · favorite
HollidayTarryn Slight earth tremor here in Carlswald Midrand at +- 00h35! Thought I was imagining things! @SAWDOS1 8 hours ago · reply · retweet · favorite
SAWDOS1 To early to tell the exact cause of the tremor. Most likely mine related. 8 hours ago · reply · retweet · favorite
JoyRecruitRite "@FamilySmiths: @SAWDOS1 felt that earth tremor in sunnyridge too, hectic" ◄ and in Orange Grove. 8 hours ago · reply · retweet · favorite
RiAiDi @SAWDOS1 You could actually hear it too!! 8 hours ago · reply · retweet · favorite
0690RGG @ruby_clipper @sawdos1 i felt it too 8 hours ago · reply · retweet · favorite
warrenegates "@moe_omarjee: Hectic Earth Tremor In Auckland Park,Rattled doors windows with Loud Rumble.What's the cause?@SAWDOS1" felt in Alberton too. 8 hours ago · reply · retweet · favorite
PietmanKahl .@PietmanKahl @SAWDOS1 how wide spread was it? #atlasville in East to #aucklandpark in the west! #tremor 8 hours ago · reply · retweet · favorite
atlasville @sawdos1 That earth tremor has not affected OR Tambo. Planes taking off. #Tremor felt right across Jhb from east to west and south. 8 hours ago · reply · retweet · favorite
FamilySmiths @SAWDOS1 felt that earth tremor in sunnyridge too, hectic 8 hours ago · reply · retweet · favorite
HollidayTarryn "@atlasville: Earth tremor in#Atlasville Wed, Feb 27, 2013 00:31:12. Woke up the birds! @sawdos1" @Trevornoah 8 hours ago · reply · retweet · favorite
kwbjhb @SAWDOS1 earth tremor roodepoort at 00h30 about 20secs 8 hours ago · reply · retweet · favorite
sumptiousbitch1 @mwmoz @SAWDOS1 @Trevornoah @atlasville I'm in edenvale felt it to whole house. windows shook 8 hours ago · reply · retweet · favorite
RiAiDi @SAWDOS1 Felt a light tremor in Centurion, Monavoni!! Wow! Scary! 8 hours ago · reply · retweet · favorite
smanjoo "@moe_omarjee: Hectic Earth Tremor In Auckland Park,Rattled doors windows with Loud Rumble.What's the cause?"@SAWDOS1 8 hours ago · reply · retweet · favorite
trustfreetks @atlasville @sawdos1 now they really shouting! Wonder wot they know next ! It was rather a cracking one #yikes! 8 hours ago · reply · retweet · favorite
moe_omarjee Hectic Earth Tremor In Auckland Park,Rattled doors windows with Loud Rumble.What's the cause?@SAWDOS1 8 hours ago · reply · retweet · favorite
ParwezLidimo @SAWDOS1 00:25 Benoni Earth tremor , bed shaking and windows rattling . Ricter scale? 8 hours ago · reply · retweet · favorite
mwmoz @Trevornoah did you feel it too? I'm in boksburg, @atlasville mentioned it too @SAWDOS1 8 hours ago · reply · retweet · favorite
mwmoz @SAWDOS1 nice earth tremor in atlasville, boksburg a few seconds ago! 8 hours ago · reply · retweet · favorite
ruby_clipper Earth tremor, quite strong, shaking windows, doors, security gates etc for about 20secs in Glenvista JHB 00H31 @SAWDOS1 8 hours ago · reply · retweet · favorite
atlasville Earth tremor in#Atlasville Wed, Feb 27, 2013 00:31:12. Woke up the birds! @sawdos1 8 hours ago · reply · retweet · favorite
Sunday, 9 September 2012
Large earth tremor felt in parts of Gauteng last night (8 September 2012 22h10 SAST)
Image: Google Maps
A large earth tremor was felt last night in many areas or Gauteng. The SAWDOS was alerted of the incident via it's SMS line at 00h17 and via an email message.
" Earth termor felt by myself at about 11h10 in Benoni, as well as Facebook friends in Kempton, Pamona and Bedford View area."
"Just had a tremor here... 3 to 5 seconds... loud rumble and tremor..." (Raine and Pierre Carosin, Germiston.)
Soon afterwards the SAWDIS Twitter account was flooded with reports:
ruby_clipper @SAWDOS1 @suidwessa we felt it in Glenvista too... And we live on top of one of the koppies! 15 minutes ago · reply · retweet · favorite
SAWDOS1 Rescuers told to keep at it after China quake kills 80: Source: reuters // ReutersSoldiers carry children as loc... bit.ly/Tx8AVg 12 minutes ago · reply · retweet · favorite
SAWDOS1 China mine accident kills 10: Beijing - Ten miners have been killed in an accident in a coal mine in northwest C... bit.ly/Tx8AVb 12 minutes ago · reply · retweet · favorite
SAWDOS1 Hamnet Weekly Report: 09 September 2012: This has been quite a week for various types of natural phenomena aroun... bit.ly/P6yQQf 12 minutes ago · reply · retweet · favorite
SAWDOS1 NASA's Global Hawk Hurricane Mission Kicks Off: An unmanned NASA Global Hawk aircraft comes in for a landing at... bit.ly/Tx8AV7 12 minutes ago · reply · retweet · favorite
SAWDOS1 Two Views of Tropical Storm Leslie: On August 30, 2012, Tropical Depression Twelve turned into Tropical Storm Le... bit.ly/P6yR6W 12 minutes ago · reply · retweet · favorite
kiewit9955 @SAWDOS1 a case of man at war with himself... about 1 hour ago · reply · retweet · favorite
deziforever2 @SAWDOS1 Wow! Hope all is well!? 7 hours ago · reply · retweet · favorite
Nadia_258TJ @SAWDOS1 came through Boksburg North as well. Car alarms went off and dogs went crazy because of it 7 hours ago · reply · retweet · favorite
GreenQueen42 @SAWDOS1 earth tremor also felt in Jo'burg South 7 hours ago · reply · retweet · favorite
TrafficSA JHB - #tremor RT @susansaayman @TrafficSA felt the tremor even here in bonaero park, kempton park 8 hours ago · reply · retweet · favorite
TrafficSA JHB - #tremor RT @TheDonDonMaster @TrafficSA @suidwessa big in Brackendowns too ! 8 hours ago · reply · retweet · favorite
ruby_clipper Anyone else feel the earth tremor in Jozi 22H47? @SAWDOS1 9 hours ago · reply · retweet · favorite
suidwessa @SAWDOS1 quite a tremor in Germiston tonight at around 22:47. Felt like 10 seconds in length. Felt like the biggest in a while... 9 hours ago · reply · retweet · favorite
ParwezLidimo @sawdos1 22:45 . Felt like a tremor in Benoni . Windows and doors shaking . 9 hours ago · reply · retweet · favorite
wayne_haw @SAWDOS1 @SAWDIS earth tremor felt in Benoni #earthtremor 22:49 #Atlasville 9 hours ago · reply · retweet · favorite
llrottie @SAWDOS1 HUGE earth tremor just felt in Benoni 9 hours ago · reply · retweet · favorite
Daniel_Medic @SAWDOS1 Just felt one mother of a tremor in boksburg. Shook the whole car and the petrol station. 9 hours ago · reply · retweet · favorite
Ysterman30 @SAWDOS1 Felt quite a earth quake here in Benoni,Jhb. Any news? 9 hours ago · reply · retweet · favorite
TrafficSA #offtraffic East Rand shaking #earthquake ? 9 hours ago · reply · retweet · favorite
It is not known at this stage whether this tremor was a mine related incident. The SAWDOS trust that the Council for Geoscience will release further info on the earth tremor. No reports of damage or injuries were received up to now.
- SAWDOS
Thursday, 9 August 2012
Earthquake - Magnitude 5.2 - SOUTHERN MID-ATLANTIC RIDGE
Earthquake Details
- This event has been reviewed by a seismologist.
| Magnitude | 5.2 |
|---|---|
| Date-Time |
|
| Location | 33.128°S, 15.871°W |
| Depth | 10.1 km (6.3 miles) |
| Region | SOUTHERN MID-ATLANTIC RIDGE |
| Distances | 544 km (338 miles) NW of Edinburgh of the Seven Seas, Saint Helena 2786 km (1731 miles) ESE of Sao Joao da Barra, Brazil 2796 km (1737 miles) ESE of Armacao de Buzios, Brazil 2797 km (1737 miles) ESE of Arraial do Cabo, Brazil |
| Location Uncertainty | horizontal +/- 16.9 km (10.5 miles); depth +/- 3.8 km (2.4 miles) |
| Parameters | NST= 95, Nph= 96, Dmin=544.4 km, Rmss=0.48 sec, Gp= 58°, M-type=body wave magnitude (Mb), Version=9 |
| Source |
|
| Event ID | usb000bstp |
- USGS
Tuesday, 31 July 2012
3.8M Earthquake confirmed in Bloemfontein (30 July 2012 10h30 SAST)
It is confirmed that the Southern Free State and Bloemfontein was rocked by an earthquake last night. The SAWDOS received an SMS message at 11h00 last night from an observer that a tremor was felt in Bloemfontein at around 10h30 SAST.
The Council for Geosciences confirmed that the earth tremor registered 3.8M on the Richter-scale. The epicenter was in the Edenburg area.
People said they felt the ground shake in areas including Edenburg and Reddersburg in the Free State as well as Aliwal North in the Eastern Cape. Earth tremors in the Southern Free State is rare but not uncommon.
More information, maps and comments on the SAWDOS Facebook Group available HERE.
Dit gons oor die ‘aardbewing’ in Bloemfontein
SOSIALE netwerke het gisteraand laat gegons nadat Bloemfontein iets ervaar het wat soos ’n ligte aardskudding gevoel het.
Talle inwoners in en om die stad het gisteraand byna onmiddellik laat weet dat hulle trillings gevoel het.
Dele waar die skudding gevoel is, sluit in: Westdene, Langenhovenpark, Bainsvlei, Universitas, Pellissier, Fichardtpark, Ooseinde, Dan Pienaar, Gardeniapark, Pentagonpark, Navalsig, Fleurdal, Bayswater en Fase6.
Omliggende dele waar inwoners ook die kort skudding gevoel het, sluit in: Edenburg, Reddersburg, Aliwal-Noord en Fauresmith.
“Dis nie die eerste keer nie! ’n Mens dink snaakse goed as jou ruite so ratel...” het Tim Taylor op Volksblad se Facebook-blad geskryf.
“Navalsig het dit ook gevoel! Die huis se dak het tot begin kreun, ek het oor die radio gehoor dat mense in Bainsvlei dit ook gevoel het,” het Marcel De Beer geskryf.
“Albei kar-alarms het afgegaan,” het Justin van Wyk laat weet.
Frans Sebastiaan het met Twitter laat weet: “@volksbladnuus ek is in Jacobsdal en die vensters het ook geskud? Het gedink die wind waai net sterk, maar geen wind buite.”
Jacques Joubert van Bloemfontein het op Twitter gesê “@volksbladnuus (Is dit die) Stormers wat terug aarde toe gekom het?”
- Volkblad
Lesers sê oor die 'aardbewing'
http://www.volksblad.com/Suid-Afrika/Nuus/Dit-gons-oor-die-aardbewing-in-Bloemfontein-20120730
Talle inwoners in en om die stad het gisteraand byna onmiddellik laat weet dat hulle trillings gevoel het.
Dele waar die skudding gevoel is, sluit in: Westdene, Langenhovenpark, Bainsvlei, Universitas, Pellissier, Fichardtpark, Ooseinde, Dan Pienaar, Gardeniapark, Pentagonpark, Navalsig, Fleurdal, Bayswater en Fase6.
Omliggende dele waar inwoners ook die kort skudding gevoel het, sluit in: Edenburg, Reddersburg, Aliwal-Noord en Fauresmith.
“Dis nie die eerste keer nie! ’n Mens dink snaakse goed as jou ruite so ratel...” het Tim Taylor op Volksblad se Facebook-blad geskryf.
“Navalsig het dit ook gevoel! Die huis se dak het tot begin kreun, ek het oor die radio gehoor dat mense in Bainsvlei dit ook gevoel het,” het Marcel De Beer geskryf.
“Albei kar-alarms het afgegaan,” het Justin van Wyk laat weet.
Frans Sebastiaan het met Twitter laat weet: “@volksbladnuus ek is in Jacobsdal en die vensters het ook geskud? Het gedink die wind waai net sterk, maar geen wind buite.”
Jacques Joubert van Bloemfontein het op Twitter gesê “@volksbladnuus (Is dit die) Stormers wat terug aarde toe gekom het?”
- Volkblad
Lesers sê oor die 'aardbewing'
http://www.volksblad.com/Suid-Afrika/Nuus/Dit-gons-oor-die-aardbewing-in-Bloemfontein-20120730
Earth Tremor felt in the Bloemfontein Area???
The SAWDOS received an SMS early this morning of an earth tremor in the Bloemfontein area. Did you feel the tremor?
Send us your reports and observations:
TWITTER: @sawdos1
FACEBOOK: http://www.facebook.com/groups/374316165928426/
EMAIL: SAWDOS
Send us your reports and observations:
TWITTER: @sawdos1
FACEBOOK: http://www.facebook.com/groups/374316165928426/
EMAIL: SAWDOS
Friday, 29 June 2012
Earthquake Magnitude Classification: South Atlantic Earthquake
GEOFON South Atlantic Ocean Jun 29 15:31 PM 5.8M 10.0 Depth
USGS South Atlantic Ocean Jun 29 15:31 PM 5.8M 10.0 Depth
EMSC South Atlantic Ocean Jun 29 15:31 PM 6.0M 10.0 Depth
Red color = CONSIDERABLE risk for damage or injuries
- Earthquake Report
Earthquake Magnitude 5.8 - SOUTH ATLANTIC OCEAN 2012 June 29 15:31:46 UTC
Earthquake Details
- This event has been reviewed by a seismologist.
| Magnitude | 5.8 |
|---|---|
| Date-Time |
|
| Location | 24.735°S, 9.723°W |
| Depth | 10 km (6.2 miles) |
| Region | SOUTH ATLANTIC OCEAN |
| Distances | 1060 km (658 miles) SSW of Jamestown, Saint Helena 2472 km (1536 miles) W of Walvis Bay, Namibia 2480 km (1541 miles) W of Swakopmund, Namibia 2502 km (1554 miles) W of Luderitz, Namibia |
| Location Uncertainty | horizontal +/- 16.4 km (10.2 miles); depth +/- 2.8 km (1.7 miles) |
| Parameters | NST=283, Nph=283, Dmin=>999 km, Rmss=1.02 sec, Gp= 43°, M-type=teleseismic moment magnitude (Mw), Version=A |
| Source |
|
| Event ID | usb000atxy |
- USGS
Monday, 11 June 2012
Tremors hit Augrabies area (10 June 2012 19h08Z )
Image: Google Maps (Click on image for larger view.)
The SAWDIS received the following Twitter message last night:
RT @KalahariB: @SAWDOS1 Augrabies tremors. Two in the past few minutes. Long rumbles, like distant thunder. 19h08Z 10/06/2012
The earthquake swarm in the area of Augrabies is still active.
Wednesday, 30 May 2012
Earthquake in Swaziland on Wednesday, 30 May, 2012 at 08:26 (08:26 AM) UTC.
THE tremor that hit Swaziland on Sunday night went as far as South Africa, as it was felt in some parts of the neighbouring country. According to Allafrica.com the earth shake in Swaziland resulted in earth tremors being felt in parts of KwaZulu-Natal and Mpumalanga. The tremor was reported to have taken place at around 9pm on Sunday night. It measured four on the Richter scale. It is said residents in Newcastle, Ladysmith, Dundee, Mkuze, Piet Retief, and Pongola felt the tremor. Aftershocks were also reportedly felt in the KwaZulu-Natal midlands. Residents are quoted saying that their houses and windows started suddenly rattling at 9pm. It only lasted a few seconds.
The Sunday tremor that was experienced throughout the country was only natural. Director of Geology Simon Mhlanga said it was not an earthquake but a tremor which was something minor. The epicentre of the tremor was at Maguga dam which might be due to the water load on the rocks. He said preliminary reports from the South Africa Council for Geo-Science showed that the tremor occurred at latitude of -26.075, longitude 31.248 at a magnitude of 4.0 on Richter scale. The adjusting of rocks was bound to happen as the rocks around and in the dam had been strained over time due to the water load. Maguga dam’s capacity is at 332 000 000m3 which amounts to 332 million tonnes. The geology department could not have been able to detect the tremor. By Swaziland standards it was big as it usually hit below 3.0. The director said anything that was beyond 6.0 on the Richter scale was fully fledged earthquake that could have devastating effects. He said Swaziland did not have a history of earthquakes but tremors were likely but will not be on a regular basis. Swaziland is seated on stable kaapvaal craton of the continent so earthquakes were unlikely.
- RSOE Edis
The Sunday tremor that was experienced throughout the country was only natural. Director of Geology Simon Mhlanga said it was not an earthquake but a tremor which was something minor. The epicentre of the tremor was at Maguga dam which might be due to the water load on the rocks. He said preliminary reports from the South Africa Council for Geo-Science showed that the tremor occurred at latitude of -26.075, longitude 31.248 at a magnitude of 4.0 on Richter scale. The adjusting of rocks was bound to happen as the rocks around and in the dam had been strained over time due to the water load. Maguga dam’s capacity is at 332 000 000m3 which amounts to 332 million tonnes. The geology department could not have been able to detect the tremor. By Swaziland standards it was big as it usually hit below 3.0. The director said anything that was beyond 6.0 on the Richter scale was fully fledged earthquake that could have devastating effects. He said Swaziland did not have a history of earthquakes but tremors were likely but will not be on a regular basis. Swaziland is seated on stable kaapvaal craton of the continent so earthquakes were unlikely.
- RSOE Edis
Tuesday, 29 May 2012
UPDATE 2: Many felt earthquake in Swaziland (27 May 2012 21h00 SAST)
According to Swaziland Geo science officials, earthquake of magnitude four is confirmed. It may be the reason (issue reported earlier, see below) that no major seismological centers reported this quake (mostly records M 4.5+ for international country).
-The earthquake tremor was even felt across South Africa. It was widely felt across Newcastle, Ladysmith, Dundee, Mkuze, Piet Retief, and Pongola.
-Minor aftershocks were also felt in KwaZulu-Natal midlands.
Read more: http://disaster-report.blogspot.com/2012/05/earthquake-in-swaziland.html#ixzz1wHBncWou
-The earthquake tremor was even felt across South Africa. It was widely felt across Newcastle, Ladysmith, Dundee, Mkuze, Piet Retief, and Pongola.
-Minor aftershocks were also felt in KwaZulu-Natal midlands.
Read more: http://disaster-report.blogspot.com/2012/05/earthquake-in-swaziland.html#ixzz1wHBncWou
Swaziland earth tremor detected in Secunda
The tremor experienced in Swaziland and eastern parts of Mpumalanga was detected by the secundaweather seismometer.
Seismograms graphs are inserted below:
Images: Secundaweather (Click on images for larger view.)
SAWDOS: The SecundaWeather Seismometer detected the Swaziland tremor, although
not a very strong signal. - Cor Rademeyer
Seismograms graphs are inserted below:
Images: Secundaweather (Click on images for larger view.)
SAWDOS: The SecundaWeather Seismometer detected the Swaziland tremor, although
not a very strong signal. - Cor Rademeyer
Monday, 28 May 2012
UPDATE 2: Many felt earthquake in Swaziland (27 May 2012 21h00 SAST)
Thanks to Jakes ZS1TP who obtained the following information regarding the location and magnitude of the earthquake that was felt in Swaziland on the 27 May 2012.
Date: 2012/05/27
Time: 20:56
Latitude: -26.075
Longitude: 31.248
Magnitude: 4.0
-Information: Council for Geoscience (Click on image for larger view.)
Date: 2012/05/27
Time: 20:56
Latitude: -26.075
Longitude: 31.248
Magnitude: 4.0
-Information: Council for Geoscience (Click on image for larger view.)
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