Earthquakes

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OFSO
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Earthquakes

#1 Post by OFSO » Sun Mar 03, 2019 8:27 am

Elsewhere on this site Alison has posted a map of earthquakes in Europe. I'm keeping a watch on the Ionian sea. There's at least a Richter 2 or more every day. Something is slipping. Probably good as its a gradual release. OTOH, there hasn't been a quake in the Pyranees for some time so likely to have a 3 or 4 some time soon.

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Re: Earthquakes

#2 Post by Cacophonix » Sun Mar 03, 2019 8:49 am

There was a 3.8 tremor in Johannesburg last week.

https://www.thesouthafrican.com/johanne ... test-news/

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Re: Earthquakes

#3 Post by Slasher » Sun Mar 03, 2019 9:21 am

Cacophonix wrote:
Sun Mar 03, 2019 8:49 am
There was a 3.8 tremor in Johannesburg last week.
Are you sure it wasn't you in FACT laying a braai 'n beer fart last week Caco and JNB copped the terran backwash wave?

If it was then Kaap Stad's richter machine must've shaken itself to bits and fallen off the table! =))

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Re: Earthquakes

#4 Post by Cacophonix » Sun Mar 03, 2019 9:29 am

I was the cause of the Tembisa tornado Slash.



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Re: Earthquakes

#5 Post by Sisemen » Sun Mar 03, 2019 9:45 am

Where dat “elsewhere Alison ....” ??

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Re: Earthquakes

#6 Post by Karearea » Mon Mar 04, 2019 1:57 am

Useful link: https://www.emsc-csem.org/Earthquake/world/?view=1

Site includes seismicity maps etc.
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Re: Earthquakes

#7 Post by llondel » Mon Mar 04, 2019 2:02 am

We get the occasional 2.5 or so on the other end of our bit of bedrock. It is good, because it's keeping the stress level down in this area, pushing it all up towards Hayward which is the fault they reckon is most likely to get go in a big way next.

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Re: Earthquakes

#8 Post by Sisemen » Mon Mar 04, 2019 2:23 am

Western Australia gets quite a few minor ones (with the occasional biggy) as the granite massif bumps along the mantle as the Australian plate rushes north at 3cm per annum.

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Re: Earthquakes

#9 Post by OFSO » Mon Mar 04, 2019 7:12 am

The EMSC app is excellent. Have it on my phones.

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Re: Earthquakes

#10 Post by OFSO » Wed Mar 13, 2019 7:13 am

Lots of earthquakes around the Gibraltar area. One Richter 4. Anyone felt them ?

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Re: Earthquakes

#11 Post by Pontius Navigator » Wed Mar 13, 2019 7:37 am

Are we sure that is Richter and not Moment Magnitude?

Why can't they leave units alone? What wrong with centigrade and millibars or watts, though lumens might be better.

And bars vice PSI?

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Re: Earthquakes

#12 Post by CharlieOneSix » Wed Mar 13, 2019 9:44 am

74 earthquakes in the UK in the last 50 days. Here's a few of the latest - Newdigate seems to be getting more than its fair share. Hope they don't crack the runway at LGW! :D The snapshot is from my website so the distances are from my home.
quakes.JPG
quakes.JPG (70.38 KiB) Viewed 196 times
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Re: Earthquakes

#13 Post by Boac » Wed Mar 13, 2019 10:01 am

Newdigate is near the Fracking site at Horse Hill - answers on a postcard?

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Re: Earthquakes

#14 Post by Sisemen » Wed Mar 13, 2019 10:58 am

Given the microscopic readings it’s probably just part of the operations and those are hardly likely to trigger earthquakes.

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Re: Earthquakes

#15 Post by Boac » Wed Mar 13, 2019 11:10 am

3.1 microscopic?

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Re: Earthquakes

#16 Post by Slasher » Wed Mar 13, 2019 1:46 pm

Sisemen wrote:
Mon Mar 04, 2019 2:23 am
Western Australia gets quite a few minor ones (with the occasional biggy) as the granite massif bumps along the mantle as the Australian plate rushes north at 3cm per annum.
Don't forget to wear a seatbelt mate when the western side of Oz hits Borneo then skids around and slams into Vietnam. Take a gun too in case the Viets don't like the sudden intrusion.

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Re: Earthquakes

#17 Post by Sisemen » Wed Mar 13, 2019 2:05 pm

Rattling along mate, rattling along!

It’s obviously another factor which has been conveniently ignored when debating climate change as it affects Australia. Ever put your hand in a bowl of swirling water, then shifted it a bit? Notice what happens to the swirl patterns? And this sizeable lump of God’s earth has shifted a considerable distance in the relatively short time that I’ve been living here!

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Re: Earthquakes

#18 Post by Magnus » Wed Mar 13, 2019 8:33 pm

Few years back in Garda, felt and recognised a pretty decent quake. (Felt quite a few in Hawai`i and Chile). It was something like a 5.5 south of us near Brescia.

The mirrors in the bigger telescopes in Hawai`i (some 8m in diameter, 22 tonnes) are held in place by shear pins. In the event of a big quake, the pins snap and the mirror drops a few cm into a supporting cushion. I saw a tech checking the alignment when a mirror was being refitted by sticking his finger in the hole. Not big, not clever.

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Re: Earthquakes

#19 Post by OFSO » Wed Mar 13, 2019 8:40 pm

Microscopic ? When a 3.7 went off under our granite mountains a few years ago at 02.30 it sounded like an express train going through the room and had people out on the streets until daybreak.

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Re: Earthquakes

#20 Post by Hydromet » Thu Mar 14, 2019 1:01 am

Had one when we were in PNG that was 7 on the Modified Mercali scale. https://earthquake.usgs.gov/learn/topics/mercalli.php The epicentre was about 200 km away under the Solomon Sea. Some interesting hydrological phenomena occurred, which one of our local trainees organised a field party (at 0200) to measure. In the town where I was, the most interesting thing was finding out what people wore (or didn't) to bed.

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