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Over FIFTY earthquakes in the last several hours in Alaska and still counting

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d1k

posted on Jun, 19 2006 @ 03:05 PM
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Got two new replies from the Alaska Earthquake Information Center people and I think this should put this to rest.


Hi Daryl:

An updated magnitude for the Rat Island earthquake of June 13 is now 6.4.
It is very common to have a strong aftershock sequence for events of this size.
There were over 200 aftershocks within the 1st ten hours after the mainshock.
Actually, more than is being reported on the USGS website. However, the aftershock decay rate is very rapid and today, 5 days post the mainshock, there are already much fewer overall aftershocks and especially larger aftershocks.
The USGS website hosts a composite worldwide earthquake catalog. With the stations of global seismic network, the USGS can achieve a uniform earthquake reporting level at about magnitude 4.5. It means that smaller quakes do not get reported in the areas with poor station coverage. USGS also gets earthquake updates from the regional networks such as Alaska regional network. Here we have much denser station coverage than the global network and are able to report much smaller quakes. If you look at aftershock sequence of a M6+ earthquake from an area with dense station coverage, such as central Alaska or California, for example, you'll see a similar picture. Hundreds of aftershocks within the 1st couple of days and decaying rapidly with time. We expect the Rat Islands aftershock sequence to last for a few more months, but at much lower levels of activity than presently.
A similar example of such an aftershock sequence can be found in AEIC or USGS catalogs for the M6.7 Nenana Mountain earthquake that occurred in central Alaska on October 23, 2002.

Regards,
Natasha


And finally, read this following link. They made a page just for the situation that happened/is happening at the Rat Islands location.

www.aeic.alaska.edu...

These two replies explains not only the amount of after shocks but what exactly is causing them. I suggest everyone reads that link as it goes into detail on what is happening.

Heres a small excerpt

The current sequence of events is of a different origin than the above mentioned underthrusting events. The faulting parameters estimated from the waveform inversion indicate strike-slip type of motion for both the mainshock and the largest aftershock. It's location, shallow, and above the down-dip end of the locked interface, is more consistent with this event occurring within the crust of overriding North American plate. In the western Aleutians, the crust is partitioned into rotating blocks, such as Buldir Block to the east and Near block to the west of the June 14, 2006 event location. If this event is the manifestation of the block rotation processes, then the NE-striking focal plane is the fault plane for this sequence. It's mechanism is consistent with the clockwise rotation of the crustal blocks.


[edit on 19-6-2006 by d1k]




posted on Jun, 19 2006 @ 04:28 PM
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Originally posted by d1k
Got two new replies from the Alaska Earthquake Information Center people and I think this should put this to rest.


Good work d1k! It was an interesting few days of hunting, nonetheless



posted on Jun, 19 2006 @ 05:43 PM
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Well, at least this wont mean an interruption to England's march to victory!



posted on Jun, 20 2006 @ 12:54 AM
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Originally posted by stumason
Well, at least this wont mean an interruption to England's march to victory!


Until the whole pacific plate causes massive quakes to hit all of eur....

... nevermind



posted on Jun, 20 2006 @ 01:45 AM
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Yup its been a great hunt. Cool links that I didn't have before. That space photo of the erupting volcano is awesome.

But one thing is still of concern. If you look at the global picture after the Sumatra quake and subsequent 5.0 and higher quakes along the Ring of Fire you can see a progression along the ringmoving along the line towards Alaska, the latest 6.4 at Rat Island.

I would keep an eye on it and see if it continues around the ring. It seems likely that if it does, Oregon to California may soon expect something along the same level.



posted on Jun, 20 2006 @ 11:34 AM
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What is the lattitude and longitude of Ratt Island, was it mentioned already, I must've missed it. Does anyone know?


d1k

posted on Jun, 20 2006 @ 11:48 AM
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Originally posted by Nygdan
What is the lattitude and longitude of Ratt Island, was it mentioned already, I must've missed it. Does anyone know?


On the USGS quake alerts that are being quoted
They are not dead on as they are the locations of the quakes and after shocks but they are in the area. 51.860 177.923



posted on Jun, 20 2006 @ 11:50 AM
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Oops Beat me to it...



posted on Jun, 20 2006 @ 12:19 PM
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This page lets you search for earthquake history by selecting a lattitude and longitude and defining an area by a radius about that longitude.


This is a link to an historical earthquake search. It is centered for 51.860 -177.923 and the radius is 50km. So thats all the earthquakes, since 1973 until march of this year, for a 100km area around Ratt Island (assuming I've entered the lat and long correctly).



posted on Jun, 20 2006 @ 12:29 PM
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Thanks I missed that page....

Its interesting how many days show 33 quakes. Maybe multiple listings from different sensor locations?

But it does clearly show that this is normal for the area



posted on Jun, 21 2006 @ 08:02 AM
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Rat Islands have started shaking again. 7 so far today with the highest being a 4.2.



posted on Jun, 21 2006 @ 02:10 PM
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Appearantly, we're not quite done yet.

MAG UTC DATE-TIMEy/m/d h:m:s LATdeg LONdeg DEPTHkm Region
MAP 2.7 2006/06/21 18:22:36 51.295 179.881 30.0 RAT ISLANDS, ALEUTIAN ISLANDS, ALASKA
MAP 3.0 2006/06/21 17:12:12 40.341 -124.688 19.8 OFFSHORE NORTHERN CALIFORNIA
MAP 3.6 2006/06/21 17:02:52 61.453 -150.228 60.0 SOUTHERN ALASKA
MAP 3.3 2006/06/21 15:07:47 51.731 176.962 1.0 RAT ISLANDS, ALEUTIAN ISLANDS, ALASKA
MAP 3.5 2006/06/21 14:03:59 51.836 177.114 1.0 RAT ISLANDS, ALEUTIAN ISLANDS, ALASKA
MAP 2.8 2006/06/21 13:45:38 46.204 -122.170 0.0 MOUNT ST. HELENS AREA, WASHINGTON
MAP 4.3 2006/06/21 13:35:38 52.891 -168.128 15.0 FOX ISLANDS, ALEUTIAN ISLANDS, ALASKA
MAP 2.7 2006/06/21 12:24:11 51.384 179.077 25.0 RAT ISLANDS, ALEUTIAN ISLANDS, ALASKA
MAP 3.6 2006/06/21 12:06:33 51.777 177.177 15.0 RAT ISLANDS, ALEUTIAN ISLANDS, ALASKA
MAP 3.3 2006/06/21 12:01:37 52.062 177.287 50.0 RAT ISLANDS, ALEUTIAN ISLANDS, ALASKA
MAP 4.2 2006/06/21 11:17:05 51.731 176.962 1.0 RAT ISLANDS, ALEUTIAN ISLANDS, ALASKA
MAP 3.4 2006/06/21 10:13:19 51.836 177.114 1.0 RAT ISLANDS, ALEUTIAN ISLANDS, ALASKA
MAP 3.2 2006/06/21 08:33:23 51.731 176.962 1.0 RAT ISLANDS, ALEUTIAN ISLANDS, ALASKA
MAP 3.1 2006/06/21 05:13:53 36.629 -121.246 10.4 CENTRAL CALIFORNIA
MAP 3.5 2006/06/21 04:57:07 56.835 -148.081 1.0 GULF OF ALASKA
MAP 2.8 2006/06/21 01:32:02 55.265 -160.271 35.0 ALASKA PENINSULA
MAP 2.8 2006/06/21 01:22:38 37.105 -121.492 2.7 NORTHERN CALIFORNIA
MAP 3.7 2006/06/21 00:44:52 52.035 177.097 5.0 RAT ISLANDS, ALEUTIAN ISLANDS, ALASKA


also, Don't know if its connected, but its interesting: Southern San Andreas fault waiting to explode: Reuters. You can link to the story on Drudge



posted on Jun, 21 2006 @ 02:57 PM
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As Nygdan so nicely showed us with those links its been going on like that since 1973. If you look on the Iris monitor site and check dates since the teunami you will see and be able to follow the progression around the ring of fire. This will give you the big picture more clearly. Yesterday gave these results:


DATE LAT LON MAG DEPTH REGION
20-JUN-2006 11:52:23 51.26 -130.95 4.0 10.0 QUEEN CHARLOTTE ISLANDS REGION
20-JUN-2006 10:02:10 51.58 -130.45 5.5 30.0 QUEEN CHARLOTTE ISLANDS REGION

www.iris.washington.edu...

The California coast is next in line, so I would say its not wild speculation to expect 4- 5 mag quakes there in the next feew weeks.

This would actually be GOOD news as it would mean the plate is shifting normal and releasing pressure without causing serious damage or "The Big one"



posted on Jun, 21 2006 @ 03:46 PM
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News in on San Andreas fault in California.

This might be south part of fault line from Rat Island

www.msnbc.msn.com...

Keeps staying interesting.



posted on Jun, 21 2006 @ 04:08 PM
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I just found that article myself. This is starting to loook very scarey. I hope nothing comes of it. My prayers go out to those people on the west coast. Stay safe.

[edit on 21-6-2006 by mecheng]



posted on Jun, 23 2006 @ 12:41 PM
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Another set of these "aftershocks"

5.8 RAT ISLANDS, ALEUTIAN ISLANDS, ALASKA

5.3 RAT ISLANDS, ALEUTIAN ISLANDS, ALASKA

Besides, all the other quakes in Alaska.




posted on Jun, 23 2006 @ 12:45 PM
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BTW, these quakes are still very close to the Kiska Volcano, Alaska



posted on Jun, 23 2006 @ 04:08 PM
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Originally posted by Ptolomeo
Another set of these "aftershocks"

5.8 RAT ISLANDS, ALEUTIAN ISLANDS, ALASKA

5.3 RAT ISLANDS, ALEUTIAN ISLANDS, ALASKA

Besides, all the other quakes in Alaska.


Yes, I just noticed this. USGS downgraded the 5.8 to 5.7 and I counted 18 quakes at Rat Islands for today so far here:
Latest Earthquakes in the World

I was also wondering about Funafuti, Tuvalu on the Live Internet Seismic Server because it was looking this way before the larger quakes shook Alaska the first time.


~DearWife



posted on Jun, 23 2006 @ 04:30 PM
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Hmm, Gareloi is the closest Webicorder, and to me the pattern from that station is very similar to the harmonic pattern of ongoing non-violent volcano eruption, i.e. when compared to at Mt St Helens. What do we know of subterranean volcanoes in Alaska ?

www.avo.alaska.edu...



posted on Jun, 23 2006 @ 04:54 PM
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What do we know of subterranean volcanoes in Alaska ?


That there are a LOT of them? All extremely active or volatile? Most active earthquake zone kinda thing?

Nice link I will ad that to my files, thanks


[edit on 23-6-2006 by zorgon]



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