Quake Watch 2011

Originally posted by angelchemuel

Does a 7.2 normally cause LISS to go this potty worldwide?
aslwww.cr.usgs.gov...

Rainbows
Jane

edit on 20-8-2011 by angelchemuel because: (no reason given)

Not really, but it looks like it does because it was 3 quakes, not just a 7.2.
I'm tending to agree with the Russians that the 2nd one of the Mag 7's was bigger, I think USGS have got it wrong, despite what Putermans graph from G.DZM shows

Looking at their (USGS) own phase data, but especially at SNZO which is my nearest station and reasonably close to the epicentres, the mb numbers suggest the 3rd quake above 6mb was the biggest. Heres an updated screenshot of SNZO and I have marked the P wave ( eP) arrival time points on the graph.

I'm sure you can see the individual quakes now ........................ not

The S waves (surface waves) have made a real mess of the LISS graphs.

*Note the usgs phase data still shows 7.5GS for the 1st one, the text onside the boxes is taken direct from the USGS phase data pages, unaltered.

Another thing to remember is that P and S waves do travel in a specific directions sometimes, often the graphs to the south will show a stronger reading than those to the north or west, depending on the structure of the Plates.
DZM NOU, -22.0716, 166.4438, 878m elevation, is at Mont Dzumac on New Caledonia Island, on the Australian Plate, as far as I can make out by the depths of all of the quakes puts them on the Pacific Plate, so anywhere close on the Pacific Plate (such as SNZO which is at the twisting point in NZ) would get the stronger waves, even though its further away than New Caledonia. I see this all the time with Kermadec Trench or East Cape Ridge quakes that shoot stronger waves at SNZO than say URZ on the Australian Plate. Quakes on the Kermadec Ridge however, which is on the overiding Australian Plate tend to show higher readings on URZ than SNZO.

Of course I could be talking through a hole in my hat, but thats the way I see it.

Please ignore me.
There's a Los Angeles in Chile.
8.2M

reply to post by MamaJ


NOAA issued a good PDF here ptwc.weather.gov... which it seems is no longer available as I cannot see a link to it on the site. There is a map in the document which shows the seismicity of the area from 1900 to 2004 which is quite good and shows a mag 8 right by yesterdays quakes. You can see this on page 4 of the document which is no longer available

It is my feeling this is purely tectonic and is a 'normal' part of events in that area (if a 7.1/7.0 can be called normal). I do not expect further quakes in the area of this magnitude - maybe a 6.5 sometime soon - but nothing in the way of 7 for a while.

There is a volcano 92 Km away and another 124 Km, but I don't think either of these are in danger of starting an eruption because of these quakes.

North Vate has not erupted in living history so has avaoided larger quakes than these.

Traitor's Head last erupted in 1881, but there may have been a submarine eruption in 1959, so again this has survived bigger events.

Yasur is a bit further away at about 200 km and has been continuously erupting since 1774 anyway. No problems there then.

There is a further bunch of three volcanoes North of there between 160 and 200 Km of the events which have been active mid last century and earlier.

reply to post by muzzy


[sarcasm]

So the Hawaii Tsunami Centre again proves it just isn't worth the funding, issuing incorrect reports again, scaring ( or not warning in this case) the public

Sorry but they did say there would be no tsunami anywhere in 'Murka. What else matters?

[/end sarcasm]

reply to post by Robin Marks


Ignoring you as hard as I can but curiosity got the better of me. What that about as I could not see a post to which it related.

reply to post by angelchemuel


02 Jan 2011 Araucania, Chile 7.1


07 April 2011 Honshu 7.1


This one may be a bit OTT
06 Jul 2011 Kermedec Isls 7.6


I should make a gallery of LISS images!!

Note to self: Don't try uploading images when in the middle of an off site backup. It corrupts them.
All OK now.

7.1 Vanuatu usc0005h9f

PDF Package for Magnitude 7.1 Vanuatu usc0005h9f now available. (1.4 Mb download)
Vanuatu_7.1_20-Aug-2011.zip

Web site images only (755 Kb download)
Vanuatu_7.1_20-Aug-2011_images.zip

View web version of page here

7.0 Vanuatu usc0005hbt

PDF Package for Magnitude 7.0 Vanuatu usc0005hbt now available. (1.6 Mb download)
2011-08-20_Vanuatu_7-0.zip

Web site images only (901 Kb download)
2011-08-20_Vanuatu_7-0_images.zip

View web version of page here

I will stop hogging the thread now!!

reply to post by muzzy

Muzzy, thank you for all that explanation and your very black chart. You're right, I still can't see the individual ones! So I shall continue to be the 'ignoramus' and when I see charts as black as that I shall prick up my ears, and probably my heels if it was in the UK. I note this morning that activity seems to be increasing generally in the whole antipodean region. Have you any thoughts on this as it is making me a little nervous for you down there.
Rainbows
jane

reply to post by PuterMan


Thank you PuterMan. I know the charts went 'balistic' with the Japanese EQ and evengood ol' Yellowstone picked it up. But I was curious about the 7.whatever's....once they make their minds up!


Rainbows
Jane

PS...I did all teh 'hogging' in the early hours with a little help from Vanuatu!

Magnitude mb 5.6
Region NEW BRITAIN REGION, P.N.G.
Date time 2011-08-21 13:04:12.0 UTC
Location 5.73 S ; 151.11 E
Depth 78 km
Distances 601 km NE Port moresby (pop 283,733 ; local time 23:04:12.8 2011-08-21)
109 km E Kimbe (pop 18,847 ; local time 23:04:12.8 2011-08-21)

Magnitude mb 5.8
Region SOUTH SANDWICH ISLANDS REGION
Date time 2011-08-21 12:38:51.0 UTC
Location 56.33 S ; 27.17 W
Depth 116 km
Distances 2993 km SE Comodoro rivadavia (pop 140,850 ; local time 09:38:51.0 2011-08-21)
2755 km SE Río gallegos (pop 85,700 ; local time 09:38:51.0 2011-08-21)

Rainbows
jane

Interesting vid about Vanuatu on Earthquake Report. Sorry don't know how to do that fancy embedding thing or whatever it's called!

www.emsc-csem.org...

Rainbows
Jane

Originally posted by PuterMan
reply to post by angelchemuel

 

02 Jan 2011 Araucania, Chile 7.1


07 April 2011 Honshu 7.1


This one may be a bit OTT
06 Jul 2011 Kermedec Isls 7.6


I should make a gallery of LISS images!!

edit on 21/8/2011 by PuterMan because: (no reason given)

Those graphs illustrate quite well the difference between one Mag 7 and two Mag 7s and a 5.9-6.4, there is a start and a finish, whereas on my SNZO graphs its a mess from one side to the other.

I've started screenshotting SNZO on a regular basis ( initially to use here on ATS) not sure what I will do with them otherwise yet.

Just to tidy things up with the Vanuatu swarm, heres a SS as it disappears off the graph, interesting how the widest trace is between 30-40 minutes, that must be the S waves arriving at SNZO.
On the 2nd 7 phase data usgs give the arrival time of the S wave (LR) as 18:30:38.26.
The other quake didn't have LR on the data so not sure where it is on the graph. Is that it at 25min, or is that the P wave of the 2nd Mag 7 at 18:24:32?
Again confirming the 2nd Mag 7 quake was the bigger one????




FWIW that one at the 13:00:00 line would be
5.8, 2011/08/21 13:04:08, -5.577, 151.011, 40.0, NEW BRITAIN REGION, PAPUA NEW GUINEA
shows on the usgs phase data only as S wave ( LR) SNZO LR 13:23:48.20

reply to post by PuterMan


aye true enough.

I wasn't concerned anyway, it seems only the ones above 7.5 that generate Pacific wide tsunamis and even the Chile 8.8 of 2010 and this years Japan 9.0 only caused some disturbances on local NZ harbours.
So if you had a yacht moored at the harbour you'd need to keep an eye on those NOAA reports.
Its the ones close to home, that you wouldn't have much time to react anyway, that are of concern.

FWIW the Australians haven't finalised there reports yet, but have at this stage;
7.5 for the first one
and 7.4 for the 2nd one

Just had a nice wee 4.4 jolt (9.61k deep) here at 8:36pm!

Near the Greendale fault region where we had our 7.1 back on 4th Sept 2010

The last few days we've had some consistent 4+ quakes (two in the last 12 hours).

Got the feeling we've got another bigger one coming in the next 2 weeks.

LINK

Morning my fellow quake watchers.

The Scottish Highlands seem to have been rocking yesterday. We have not 1 not 2.....but 5 quakes all in Lochailort, Highlands.

DATE
21/08/2011

ORIGIN TIME
08:37:23.7 UTC

LOCATION
56.854 -5.747

DEPTH
16.7 km

MAGNITUDE
2.9 ML

LOCALITY
LOCHAILORT,HIGHLAND

Felt Lochailort, Glenfinnan and Acharacle. Reports described "there was a bang, then a rumblng, almost like a distant explosion", "rumble lasted for two or three seconds with a distinct thump" and "it was the loudest and most severe we've witnessed since living here but thankfully the shortest".....Continued here

DATE
21/08/2011

ORIGIN TIME
11:13:10.1 UTC

LOCATION
56.855 -5.724

DEPTH
14.0 km

MAGNITUDE
1.4 ML

LOCALITY
LOCHAILORT,HIGHLAND

More details here

DATE
21/08/2011

ORIGIN TIME
11:16:55.9 UTC

LOCATION
56.844 -5.769

DEPTH
11.5 km

MAGNITUDE
0.9 ML

LOCALITY
LOCHAILORT,HIGHLAND

More here

DATE
21/08/2011

ORIGIN TIME
17:26:23.6 UTC

LOCATION
56.841 -5.759

DEPTH
11.3 km

MAGNITUDE
0.8 ML

LOCALITY
LOCHAILORT,HIGHLAND

Link

DATE
21/08/2011

ORIGIN TIME
18:24:13.9 UTC

LOCATION
56.865 -5.666

DEPTH
11.4 km

MAGNITUDE
2.0 ML

LOCALITY
LOCHAILORT,HIGHLAND

Felt Lochailort & Acharacle.

Link

Credit to BGS

Here is an article from the BBC in regards to these quakes. They say four but there were infact five.

The BGS said earthquakes were a common event in the west Highlands but added that to have four on the same day was "slightly unusual".

reply to post by muzzy


You know what muzzy? I think there is an aroma of pork pie in the air. In fact it is quite strong.

Here is the trace of the 2 Vanuatu quakes as recieved at SNZO on the BHZ channel (I could not get LHZ for some reason)

This is NOT the difference between 7.1 and 7.0. The first quake is WAY larger so 7.5 as originally estimated looks right.



ETA: I like to double chack these things.

This next plot is from the VHZ channel. VHZ is VERY useful for identifying events from noise on the IRIS webicorder plots because it is 0.1 samples a second against 20 samples a second for BHZ (sometimes 40) and 1 sample as second for LHZ

This confirms that the first quake was substantially larger than the second quake.

Wow we now have three more to add to the five from yesturday!!

DATE
22/08/2011

ORIGIN TIME
00:43:22.2 UTC

LOCATION
56.854 -5.725

DEPTH
12.7 km

MAGNITUDE
0.6 ML

LOCALITY
LOCHAILORT,HIGHLAND

------------------------------------------------------------------------------------------------------------------------

DATE
22/08/2011

ORIGIN TIME
02:37:46.5 UTC

LOCATION
56.862 -5.707

DEPTH
12.3 km

MAGNITUDE
0.5 ML

LOCALITY
LOCHAILORT,HIGHLAND

-----------------------------------------------------------------------------------------------------------------------------

DATE
22/08/2011

ORIGIN TIME
03:15:18.8 UTC

LOCATION
56.852 -5.766

DEPTH
12.7 km

MAGNITUDE
0.7 ML

LOCALITY
LOCHAILORT,HIGHLAND

Credit to BGS

reply to post by boo1981


Ooh Noo, 'tis the end or the wurld! The Picts are ganging doon in tae the watter. The Cali rift is breakin'. Nessie will be set free. Another wee dram Jock?

Interesting. I must take a look at this and thanks for posting it.

ETA. Just looked at BGS and it is saying 8

Run for your lives Scotland afore ye sink!

reply to post by PuterMan


Tat gave me a rit giggle hen! (my mothers side is Scottish)

Yes I've made a thread about it, I wasn't going to based on just the five from Sunday. But on having another look today's ones had just been added.

Here is a link to my thread....www.abovetopsecret.com...


Yep eight now! I've added them above, three new ones today. ^^^^^^^