Remove ads from site

doctormog
09 October 2016 13:50:46

This thread is for general earthquake discussion.


Not that I think it is significant but what prompted me was the magnitude 4.8 quake off the west coast of Norway http://earthquake.usgs.gov/earthquakes/eventpage/us20007cxs#executive


The reason it made me stop and ink is becaus it is in a very similar location to that of the massive historical underwater land slip known as the Storegga Slide (and not I don't expect a repeat). https://en.m.wikipedia.org/wiki/Storegga_Slide 


Anyway as mentioned,  this thread is for any general earthquake-related discussion and will be kept "sticky".


ozone_aurora
09 October 2016 17:58:00

The BGS downgraded it to 3.8 magnitude.


This area is seismically quite an active area; there was a 4.8 M event in January 2007, and the strongest quake in the last 100 years was a 5.7 M event in 1927. Oil and gas installations have to be designed to cope with potentially damaging earthquakes in this area.


This area has been unusually quiet in the last few years compared to more active periods in 1980's and 1990's.

doctormog
ozone_aurora
09 October 2016 19:05:32

Yes, thanks for mentioning it. I find earthquakes in North Sea & Norwegian Sea interesting, prompting me to reply.


I am surprised by BGS downgrade (and perhaps little disappointed, although I don't wish any damage to installations-and glad there hasn't been any).

lizsecurro
16 October 2016 10:53:43

We haven't been convincing enough with the rest of the world regarding 'climate change', so you know the liberals will blame this on the US as usual. why do earthquakes happen

lizsecurro
17 October 2016 10:27:13

On September 3, 2016, a magnitude 5.6 earthquake that occurred in Pawnee, Oklahoma, was recorded by Weston Observatory (see seismogram below). This earthquake is tied with another magnitude 5.6 earthquake in Prague, OK (November 6, 2011) as the two largest known earthquakes in Oklahoma.  

doctormog
17 October 2016 10:33:13
Second request. Please reply to this message to confirm you are not spamming or both your messages will be removed and your account locked. Thanks.
DEW
  • DEW
  • Advanced Member
26 October 2016 21:07:09

http://www.dw.com/en/strong-earthquake-strikes-central-italy-shaking-historic-buildings-in-rome/a-36165190


Some reports say two separate earthquakes


https://www.rt.com/news/364216-italy-quake-hits-perugia/


 


War does not determine who is right, only who is left - Bertrand Russell

Chichester 12m asl
doctormog
26 October 2016 21:16:04


Yes, there were two quakes - one at 17:10UTC (M5.5) and a stronger one at 19:18UTC (M6.1). 


doctormog
28 October 2016 20:39:22
And another quake in the Tyrrhenian Sea this evening, magnitude 5.9. It certainly continues to be very active in that whole region in recent days and weeks.
doctormog
30 October 2016 07:40:49
...and another very large quake in the region this morning at magnitude 6.6. Not good.
DEW
  • DEW
  • Advanced Member
30 October 2016 10:24:39

Is there precedent for a string of near-major earthquakes in this or any other region? (I concede that a 6.6 feels major if you're in the middle of it, but with the logarithmic scale used, it's a long. long way off a 7.5, say). And if so, what happened thereafter? With Italy being a volcanic region, often a fact overlooked since it's been quiet for a generation (Vesuvius in 1944), should we expect some magma movement and eruptions which are now overdue?


War does not determine who is right, only who is left - Bertrand Russell

Chichester 12m asl
doctormog
30 October 2016 12:57:04


Is there precedent for a string of near-major earthquakes in this or any other region? (I concede that a 6.6 feels major if you're in the middle of it, but with the logarithmic scale used, it's a long. long way off a 7.5, say). And if so, what happened thereafter? With Italy being a volcanic region, often a fact overlooked since it's been quiet for a generation (Vesuvius in 1944), should we expect some magma movement and eruptions which are now overdue?


Originally Posted by: DEW 

It's a good question and I'm not sure if anyone would have a definitive answer. You could say that in some cases the quakes have been releasing tension that had built up but in this case the suggestion has been more of a case of one quake leading to instability in another part of the fault region in turn leading to further quakes.


I did wonder about the potential link to volcanic activity but have a hunch it would be a tenuous one. However I would be very surprised if the experts are not checking...just in case.


In the immediate future I would expect to see the aftershocks continue for a few days but whether there are more quakes in this area of magnitude - I've no idea. It's what makes the situation so fascinating but equally so potentially deadly.


Patrick01
31 October 2016 05:48:41

Good post over on Volcano Cafe about this:


http://www.volcanocafe.org/the-apennine-fault/


Looks as though there is a history of faults 'unzipping' in that area and it looks to be purely tectonic, though it may not be fully over which must be concerning for people living in the region.


I'm no expert, but from what I've read the connections between tectonic events and volcanic activity tend to be tenuous at best, and difficult to prove. A famous example of a potential connection between the two would be the 62 AD Pompeii earthquake, which was of course followed 17 years later by the 79 AD eruption of Vesuvius. 

Dougie
13 November 2016 11:29:42

Report of a 7.4 quake in New Zealand.


Ha'way the lads
Hungry Tiger
13 November 2016 11:47:35


Report of a 7.4 quake in New Zealand.


Originally Posted by: Dougie 


Just heard about that - heard it was near Christchurch.


 


Gavin S. FRmetS.
TWO Moderator.
Contact the TWO team - [email protected]
South Cambridgeshire. 93 metres or 302.25 feet ASL.


Hungry Tiger
13 November 2016 11:54:59

More on that New Zealand earthquake.


http://www.independent.co.uk/news/world/australasia/earthquake-new-zealand-christchurch-latest-magnitude-74-quake-hits-strikes-a7414661.html


Gavin S. FRmetS.
TWO Moderator.
Contact the TWO team - [email protected]
South Cambridgeshire. 93 metres or 302.25 feet ASL.


doctormog
13 November 2016 12:52:34


USGS has revised the magnitude of the quake to 7.8 and EMSC have it at 7.9. Either way it looks like a rather large quake in a populated area.


ARTzeman
13 November 2016 16:09:25

Tsunami followed 1 wave at least 8ft high. BBC NEWS has images of cracks in roads and othe r damage.






Some people walk in the rain.
Others just get wet.
I Just Blow my horn or trumpet
Gray-Wolf
13 November 2016 18:31:53

Looking at the new Paper on how the Moon has kept mantle temps high ( and our dynamo up and running to keep us safe from the universe) due to the gravitational peturbations it causes ( not just the tides eh?) could this 'closest since 1948' Supermoon be wiggling faults allowing movement?


Koyaanisqatsi
ko.yaa.nis.katsi (from the Hopi language), n. 1. crazy life. 2. life in turmoil. 3. life disintegrating. 4. life out of balance. 5. a state of life that calls for another way of living.
VIRESCIT VULNERE VIRTUS
doctormog
13 November 2016 19:39:53
I think that is a very interesting question GW and one that I think will and should have lots more research time and effort spent on it.

On the subject of the NZ quake(s), the aftershocks are still coming in at a rapid frequency and interestingly at two or theee distinct separate locations.
DEW
  • DEW
  • Advanced Member
22 November 2016 08:18:57

From my daughter staying in Tokyo. Not the first email one wants to read in the morning = apart from the last bit!


"We were woken up by the earthquake this morning. All ok in Tokyo"


From the Telegraph


Japan earthquake; small tsunami at Fukushima after 7.4 magnitude quake


http://www.telegraph.co.uk/news/2016/11/21/japan-earthquake-73-magnitude-earthquake-strikes-fukushima/


 


War does not determine who is right, only who is left - Bertrand Russell

Chichester 12m asl
Dougie
07 December 2016 04:31:55

24 die in Aceh Province, Sumatra, from an undersea earthquake measuring 6.4. The death toll is likely to rise.


http://www.bbc.co.uk/news/world-asia-38232611 


Ha'way the lads
doctormog
08 December 2016 18:51:16
Quite an active period currently with a 6.5 quake off the coast of N California earlier and a magnitude 7.8 quake in the Solomon Islands in the past hour or so.

There seems to have a bit of background rumbling in the west coast of S America in recent weeks and I would not be surprised to see a large quake in that region in the coming weeks.
Users browsing this topic
    Ads