Earthquake Activity Thread

[stormforce 10]

Although they're earthquakes, perhaps swarms under Katla, etc. (as opposed to every minor movement) might be better posted in the volcanic activity thread.

Edit:

Al-Jazeera are reporting a mag. 6.6 in the vicinity of Delhi, although there's nothing on either the USGS or EMSC websites yet.

yes just heard this on al jazeera aswell. strong earth tremor in new delhi.

[john pike]

cr

Earthquakes list September 7, 2011 – Earthquake in India, no seismological data yet

http://earthquake-report.com/2011/09/06/earthquakes-list-september-7-2011/

no info received yet but use link for updates

4.2 magnitude earthquake in the New Delhi – Haryana area, India

http://earthquake-report.com/2011/09/07/strong-5-8-earthquake-in-india/

if this is 4.2 it must have been very shallow in depth

[DAVID SNOW]

John,

It's not other people's fault this thread has gone off track and this perhaps arbitrary guideline has been set. It's purely a response to the over-zealous and unnecessary reporting of every single earthquake to, we can only assume, prove an ever-shifting and outlandish theory.

In your opinion.

Others perhaps just want to see whats happening and where.

[TEITS]

Hi,

I've never posted before been an observer for a couple of years and a member since January. I completely agree with John, I think we would miss so much if eathquakes below 6 were not reported especially regarding Iceland but also the quake swarms at El Hierro, Canary Islands. Both of these could impact the UK and are incredibly fascinating! But I do think some are sensationalising, I'm not sure what the right way to correct this would be but I don't think reporting just over mag 6.0 is right. Just my twopeneth!

knowm on the forum as Summer although member name is Willow Woman also Rebecca from North Yorkshire! bit mixed up on names!

I agree with some of your comments and those of Johns. However im with OON on this one. I just don't feel as though we need to know about 5.0 earthquakes that occur within the ring of fire because obviously this is a very active area. This is like posting everytime it rains in Manchester. If a 5.0 earthquake occured in say the UK then thats a different matter.

[chionomaniac]

I agree that the limit should be 6.0 or above. However, there is nothing to stop the contributors to this thread from making us aware if there has been a particularly noteworthy swarm of lesser earthquakes that has occurred. Common sense should prevail.

[yamkin]

Indian authorities from what I can tell say the magnitude was 5.7. Here's a video clip which shows 5.7.

[bobbydog]

I agree that the limit should be 6.0 or above. However, there is nothing to stop the contributors to this thread from making us aware if there has been a particularly noteworthy swarm of lesser earthquakes that has occurred. Common sense should prevail.

yes, this is the point. if people want to know about every earthquake in the world, they can refer to the link i posted earlier. this would give members an insight as to how commonly quakes occur and where. however, some smaller quakes have greater significance due to their location. common sense is the key here

[Snowyowl9]

I agree that the limit should be 6.0 or above.

Depends the 5.8 in virginia was significant largest for that area for 112 years and the 5.3 in spain earlier in the year caused lots of damage something like that a shallow quake.

[Methuselah]

Depends the 5.8 in virginia was significant largest for that area for 112 years and the 5.3 in spain earlier in the year caused lots of damage something like that a shallow quake.

True, but we have to have a cut-off somewhere. Otherwise it'd be like having a thread containing an endless stream of, say, wind reports for anything other than a dead calm?

There must be (?) thousands of sub-5 (Richter scale) earth-tremors throughout the year - somewhere in the world...

[yamkin]

Here's a very good earthquake link. There have been earthquakes around Europe today which have been felt according to EMSC. They are not 6.0 and over, but thought the info and link would be useful http://www.emsc-csem.org/Earthquake/index.php

[Osbourne One-Nil]

Depends the 5.8 in virginia was significant largest for that area for 112 years and the 5.3 in spain earlier in the year caused lots of damage something like that a shallow quake.

As I said, if there's a good reason, then feel free to include it.

[Crepuscular Ray]

Yamkin, please post links to useful sites in the "useful links" thread rather than the activity thread. The EMSC site has already been listed there and referenced here many times.

Cheers!

As a matter of minor interest, given that Al-Jazeera mentioned a 6.6 quake in India yesterday that was only several hours later downgraded to a 4.3 but not mentioned at any point on EMSC or USGS, are there national organisations that EMSC/USGS don't link to or bother to report below a certain threshold? USGS claim they show worldwide quakes above 5.0 so should have registered it before it was downgraded and it fell within EMSC's criteria, on top of which EMSC never seems to mention New Zealand quakes.

Edited September 8, 2011 by crepuscular ray

[john pike]

MAP 4.2 2011/09/08 19:02:48 51.779 5.960 14.3 THE NETHERLANDS

http://earthquake.usgs.gov/earthquakes/recenteqsww/Maps/10/10_50.php map

http://quakes.globalincidentmap.com/map_detail.php?id=132711

Moderate shallow magnitude 4.6 earthquake with epicenter on the Germany / Holland border

http://earthquake-report.com/2011/09/08/moderate-shallow-earthquake-with-epicenter-in-germany/

had to post this as it is in such an unusual place

[Crepuscular Ray]

You're right; it is unusual, and a good example of the need for a bit of flexibility on this thread, given that it was at a depth of only 10 km in a very unusual area (given that the thread's intention was originally about unusual as well as large quakes).

What sort of fault is at 10 km under northern Holland?

[john pike]

http://2.bp.blogspot.com/_ypalM7eSBEQ/SdzT_ajylVI/AAAAAAAAAbM/XNB1-z6lvKg/s1600-h/tectonic_map.jpg

map of world faultlines

having trouble locating which one is near holland

[Crepuscular Ray]

Thanks JP

That map appears to cover plate boundaries only rather than local fault lines, of which there are a fair few in the area. Did we ever get any explanation about the earthquake in Kent a while back? I assume that there must be either 1) relict faults deep down that predate the surface rocks or 2) quakes caused by the continuing uplift of the southern Brit Isles/northern continent due to the release in pressure by not having 1 km of ice pinning it down. I have no idea which, if either, is vaguely approaching a half-decent explation.

CR

[john pike]

http://www.emsc-csem.org/Earthquake/

please look at link as northern italy seem to be getting

a lot of quakes at present.

[Argyllcraig]

Hi John, that part of northern Italy is quite well know for its geothermal energy and as such there are a couple of generating plants up there. I think that because the quakes are so coordinate specific that it might be that one of said plants has fired up its generating process and as such the movement of water through the system will show up as quakes.

Larderello is also located near by too

[stormforce 10]

magnitude 6.7 earthquake at depth of 2.0km. location vancouver island canada. time 8mins ago.

[john pike]

MAP 6.7 2011/09/09 19:41:35 49.474 -126.974 25.9 VANCOUVER ISLAND, CANADA REGION

http://earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/quakes_all.html

20.9 deep

http://earthquake.usgs.gov/earthquakes/recenteqsww/Maps/10/230_50.php map

http://quakes.globalincidentmap.com/

http://ptwc.weather.gov/

watch for tsunami warnings

[john pike]

rsoe figures

Magnitude: 6.7

Mercalli scale: 8

Date-Time [uTC]: 09 September, 2011 at 19:41:33 UTC

Local Date/Time: Friday, September 09, 2011 at 19:41 in the evening at epicenter

Location: 49� 32.400, 126� 50.400

Depth: 10 f km (6.21 miles)

showing 10km deep

location map

http://hisz.rsoe.hu/alertmap/read/index.php?pageid=seism_read&rid=210074

Very strong earthquake along the coast of Vancouver Island – depth 23 km Magnitude 6.4

http://earthquake-report.com/2011/09/09/very-strong-earthquake-along-the-coast-of-vancouver-island/

yellowstone certainly took a big jolt from this

http://www.isthisthingon.org/Yellowstone/daythumbs.php

[Crepuscular Ray]

Ouch! The correlation at that distance is amazing; even I'm not sure that can be written off as a coincidence.

Edited September 9, 2011 by crepuscular ray

[john pike]

09-SEP-2011 19:44:59 36.35 -117.63 4.1 31.9 CALIFORNIA-NEVADA BORDER REGION

now i know this is not too large but thought i would show this as it could

be linked the the Canada quake

http://www.iris.edu/seismon/last30.html

http://quakes.globalincidentmap.com/

list of quakes

Friday

09.09.2011 21:37:26 63.601 -19.293 9.0 km 1.1 34.58 4.8 km SSW of Goðabunga

Friday

09.09.2011 21:32:31 63.657 -19.136 15.4 km 2.3 61.82 5.9 km ENE of Goðabunga

Friday

09.09.2011 20:54:13 63.568 -19.237 5.3 km 0.5 39.52 6.9 km W of Hábunga

list of recent quakes near katla

http://en.vedur.is/earthquakes-and-volcanism/earthquakes/myrdalsjokull/#view=map

[john pike]

Sunday September 11 2011, 23:37:30 UTC 22 minutes ago Vanuatu 6.0 1.0

http://ptwc.weather.gov/

this is out at sea but very shallow

keep eye on link to see if tsunami

warning comes up

MAP 6.0 2011/09/11 23:37:36 -18.186 167.874 35.1 VANUATU

completely different depth here

will have to wait a little while for actual figures

[yamkin]

No Tsunami Warning Magnitude 6.0 - VANUATU http://wcatwc.arh.noaa.gov/