Friday, May 9, 2014

LOCAL HISTORY OF EARTHQUAKES/EARTH TREMORS - what they don't teach you in standard 4

Facebook note import - May 9, 2014 at 10:43am

UPDATE: Magnitude 6.5, less than 2 km from Sojwe, Botswana on 3/01/17. Felt all over Botswana, SA, Namibia and Zimbabwe.

So I woke up (in Copenhagen) this morning to news that people back home had risen to rousing feelings of 'the earth moving' 'what sounded like a loud truck' 'a little something' …Batswana have quite a natural turn of phrase. It turns out people at least as far out as Mmopane and Mahalapye and definitely the capital city had felt…something move beneath their feet. So I thought I'd do a little recap of past happenings that are on record somewhere…I'm no seismologist, I'm afraid you'll have to dig around elsewhere for more meat on the bones. It sounds like it was an earth tremor, we are much more Facebook/cyber aware now and that means we communicate a bit more often, quickly and widely about happenings which is probably why this feels like a first.

The stats sourced from Map data ©2014 AfriGIS (Pty) Ltd, Google Imagery ©2014 NASA, TerraMetrics/ -I'm assuming these are on the Richter scale:

 I took this pic in Maun which keeps popping up on this list of hotspots 
5 years ago 4.0 magnitude, 10 km depth
Maun, North-West, Botswana

8 years ago 3.8 magnitude, 13 km depth
Maun, North-West, Botswana

12 years ago 4.5 magnitude, 10 km depth
Mahalapye, Central, Botswana

19 years ago 3.9 magnitude, 10 km depth Molepolole, Kweneng

21 years ago 3.8 magnitude, 33 km depth
Mahalapye, Central, Botswana

24 years ago 3.3 magnitude, 10 km depth
Ramotswa, South-East, Botswana

In Setswana an earthquake is called thoromo ya lefatshe which translates to "the shaking of the earth" - basically does what it says on the box but who the Charles! is Richter and where the pumpkin patch does he fall between a centimeter and a kilogram?

Any excuse to learn something new; BBC says 'There are thousands of earthquakes across the Earth each day. Most are too small to be detected without monitoring equipment, but some are powerful enough to destroy a city.'
Sounds like so far no damage has been reported, thank whatever gods lay claim to your soul but when is an earthquake an earthquake? Beyond the shaking of the ground I don't know but wikipedia probably does - seismological agencies haven't yet registered todays and someone posited it might be mining induced/related so…you tell me.

UPDATE: It turns out it was 3.0 on the Richter scale, there was no damage reported and as the closest mine is 250km away, it is unlikely it was fracking but some still posit that fracking might have something to do with it.

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