Quake Watch 2011

Another Southern Ocean mystery quake.
I can't find anything that corresponds on any of the networks.
As happened the last time 18/6/2011 it was within an hour of a Balleny Is. Mag 5
It showed quite stronger on Narrogin ( Western Australia) than Charters Towers ( Queensland) so I'm picking this Mag 5+ ? was "South of Australia" down below Tasmania or The Great Australian Bight.

I wonder how many of these get missed?, I don't check every day, but thats 2 this month I've seen in casual passing.
How much would that skew the USGS graphs eh?

reply to post by muzzy


Very very very approximately on the 'gernerlised' travel velocities of 7 km/s for p-waves and 4 km/s for s-waves the point at where the p-wave and s-wave differ by 4.45 minutes (as measured from the plot) represents a distance of 1,424 km that the event took place from the SNZO station. (Not being a dab hand at maths I think this is 5.333 * the p to s difference) 4.45 minutes is 267 seconds which * 5.333 = 1424 approx.

Rather than drawing circles as I did last time I think this method will find an intersect much quicker. It requires a reasonably clear plot and screen callipers (one of the most useful tools I have found) to measure the difference between the p and s wave arrivals.

A couple 5's off the Alaska coast again. I think the 2-5.0's are duplicate..

Tuesday June 28 2011, 16:32:13 UTC 22 minutes ago Northern California 1.4 2.8 Detail
Tuesday June 28 2011, 16:13:33 UTC 41 minutes ago Fox Islands, Aleutian Islands, Alaska 5.0 40.0 Detail
Tuesday June 28 2011, 16:13:33 UTC 41 minutes ago Fox Islands, Aleutian Islands, Alaska 5.0 40.0 Detail
Tuesday June 28 2011, 16:13:32 UTC 41 minutes ago Fox Islands, Aleutian Islands, Alaska 5.3 30.6 Detail
Tuesday June 28 2011, 16:04:04 UTC 51 minutes ago Hawaii region, Hawaii 2.8 40.8 Detail

reply to post by muzzy


The sound file below is the mystery quake and Balleny Island at 4000 times speed (because it is from LHZ at 1 Hz rate) (Actually it might just be that Rolf Harris knobbled the sound)

mystery-quake-2011-06-27.wav

The first sound you hear is from SNZO and SBA together (see the graphic below) then there is a gap and you hear SNZO. Another gap and you then hear SBA.

The mystery quake is closer to SBA and Balleny (obviously) is closer to SBA, but the sound of the quake seems about the same from both, whereas the Balleny quake is much quieter on SNZO.

[atsimg]http://files.abovetopsecret.com/images/member/b27b92efbb99.gif[/atsimg]




ETA

[atsimg]http://files.abovetopsecret.com/images/member/e6ddcef8f55f.gif[/atsimg]

This point however does NOT explain how Balleny @ 5.2 is only about the same 'volume' as the mystery quake as it was only 10.2 depth. I think this makes this quake, as muzzy stated, at least a 5+

The only problem with this location is that the station you see there has not trace of this quake. It only has a BHZ channel however so that may be the problem there but it is a 40Hz instrument so I would expect to see something.



It could however possibly be explained if the earthquake was located here:

[atsimg]http://files.abovetopsecret.com/images/member/6d8808b77acd.gif[/atsimg]




ETA

In my previous post "gernerlised" is generalised of course. Dgiital dylsexia again!

reply to post by PuterMan


hey thats a pretty handy tool, I could use that for scaling off building plans without having to print them out, I might just get the paidup version so I can use it.

reply to post by PuterMan

I was thinking it was in the other direction, to the west of Macquarie, because of the strong reading on Narrogin, Western Australia. Casey showed it too, but not as strong as Scott Base, but they are not that far apart so you may be right.

I think Maquarie is broken.

LOL - You 2 figured it out for Them - is this it?

== PRELIMINARY EARTHQUAKE REPORT ==



Region: BALLENY ISLANDS REGION
Geographic coordinates: 63.818S, 171.426E
Magnitude: 5.5 Mw
Depth: 10 km
Universal Time (UTC): 27 Jun 2011 20:04:16
Time near the Epicenter: 28 Jun 2011 07:04:16
Local standard time in your area: 27 Jun 2011 15:04:16

Location with respect to nearby cities:
1997 km (1241 miles) S (179 degrees) of Dunedin, New Zealand
2515 km (1563 miles) S (184 degrees) of WELLINGTON, New Zealand


ADDITIONAL EARTHQUAKE PARAMETERS
________________________________
event ID : US 2011mrb1

reply to post by Anmarie96


Clever clogs! Yes. When did they put that one in the list. It was not there earlier.

Guess we sort of sussed it out then. I still don't think that looks quite right but I would need to measure the counts in each of the sound files to see what the actual difference is, and it is not worth the effort as the quake has appeared.

reply to post by Anmarie96

Yep thats it then, on the phase data they have a time stamp at the bottom of the page

Generated 2011 JUN 28 at 18:39 UTC

neic.usgs.gov... = 6hrs 40minutes ago

not as far west as I expected

Still nothing for the one on the 18th though
www.abovetopsecret.com...

keep looking on the 8-30 days page neic.usgs.gov...

I think something is building for NZ, only 9 events yesterday and 12 today, quite low figures, there was a 4.3 out on the Hikurangi Plateau (Pacific Plate) last night NZST (2011/06/28 09:58:12.92UTC), -37.5244 -179.2833, 22km deep

reply to post by muzzy



Hah! I'm trying not to think about it and enjoy this quiescent period.

sure is quiet in the quake world,.
yet,. doom lurks....

reply to post by PuterMan


They had only posted that quake moment before I presented it here :-) as you said - you all drug it out of them - Sweet eye Muzzy! Awesome plots Puterman! That Calliper looks to be an outstanding for such work on the pc

5.0 2011/06/29 08:22:14 -32.242 -71.231 49.8 VALPARAISO, CHILE
4.7 2011/06/29 07:02:26 -33.966 -71.922 18.0 OFFSHORE LIBERTADOR O'HIGGINS, CHILE
5.5 2011/06/29 05:36:49 -33.863 -72.072 17.5 OFFSHORE VALPARAISO, CHILE

earthquake.usgs.gov...

Originally posted by muzzy
I think something is building for NZ, only 9 events yesterday and 12 today, quite low figures, there was a 4.3 out on the Hikurangi Plateau (Pacific Plate) last night NZST (2011/06/28 09:58:12.92UTC), -37.5244 -179.2833, 22km deep

You and me both. The Darfield 3.8 earlier felt much bigger than that and the movement was very reminiscent of the 7.1 *shudder*. It was, as usual, a big east-west shunt (neigbour said nearly knocked her off chair) - my desk certainly moved and it's a heavy beast.

Then, not long after, we get a 4.1 on the West Coast. I dunno, just makes me a bit nervous.. too quiet..

reply to post by berkeleygal


All familiar locations from the Chile 8.8 aftershock sequence... are these still being classified as aftershocks, I wonder?

I thought you might be interested in this

An international team of geoscientists has discovered an unusual geological formation that helps explain how an undersea earthquake off the coast of Sumatra in December 2004 spawned the deadliest tsunami in recorded history.

Instead of the usual weak, loose sediments typically found above the type of geologic fault that caused the earthquake, the team found a thick plateau of hard, compacted sediments. Once the fault snapped, the rupture was able to spread from tens of kilometres below the seafloor to just a few kilometres below the seafloor, much farther than weak sediments would have permitted. The extra distance allowed it to move a larger column of seawater above it, unleashing much larger tsunami waves.

Now to try a link lol

www.irishweatheronline.com... (not sure if that is right or not, fingers crossed)

reply to post by TeresaDarling


A follow on from this 2005 report perhaps?

soundwaves.usgs.gov...

The accuracy of this simulation by comparison to the actual (2005 report again) would suggest that this is not new information.

HINDCAST OF TSUNAMI FLOODING IN ACEH – SUMATRA

In this paper we have shown that the initial excitation applied in TPM, which was determined using reverse modeling technique, is able to reproduce the Sumatra 2004 tsunami propagation with Delft3D model rather accurately.

reply to post by MoorfNZ


I was wondering the same thing... they say aftershocks can go on for years, so maybe they are.

Can any of the experts here verify whether a claim I read some months ago about there being a massive undersea volcano, just offshore of Christchurch, is for real or just speculation?

I mean honestly, there are tens of thousands of undersea volcanoes, but what do we really know about their part in what's happening around the "extinct" Lyttelton & Akaroa volcanoes?

BTW, I've been hearing crazy talk here in Christchurch lately, about predictions of 9 mag quake possibility, in the near future! Surely not possible given the size of the fault line required???