Johannesburg Earthquake - 21 June 2014

At about 17.30 I saw a number of retweets from @Abramjee about earth tremors being felt in the Johannesburg/Pretoria area:

Having fact-checked a previous earth-shaking event I knew exactly where to go for the information. I hadn’t spotted it before but although the network states that reports are received every 10 minutes the charts were showing about an hour’s lag from real-time (even allowing for time zones), so the truth wasn’t available for another hour or so.

Now the truth has been revealed, and yes, it looks like there were a couple of tremors detected at both Lobatse and Boshof.

Seismogram of 21 June 2014 Johannesburg Earthquake - Lobatse Station

Seismogram of 21 June 2014 Johannesburg Earthquake – Lobatse Station

Seismogram of 21 June 2014 Johannesburg Earthquake - Boshof Station

Seismogram of 21 June 2014 Johannesburg Earthquake – Boshof Station

The tweets above occur around 17:10, and the charts are in UTC/GMT so the traces around 15:05UTC to 15:10UTC correspond, given the magnitude and a slight offset in the timing it looks like the event was closer to Lobatse – in the same way as the previous event linked above. Interesting that there don’t seem to be any reports of an apparently larger event at about 14:17UTC – maybe the single events fade into the background?

Hopefully we’ll see some more informed commentary in tomorrow’s newspapers.

2 comments to Johannesburg Earthquake – 21 June 2014

Leave a Reply

 

 

 

You can use these HTML tags

<a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>