EQ Alaska region Aleutian islands , 6.4 near Tanaga Volcano: correction

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posted on Sep, 26 2012 @ 10:37 PM
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6.9 Mwp - ANDREANOF ISLANDS, ALEUTIAN IS.

Preliminary Earthquake Report
Magnitude 6.9 Mwp
Date-Time
26 Sep 2012 23:39:58 UTC
26 Sep 2012 14:39:58 near epicenter
26 Sep 2012 15:39:58 standard time in your timezone
Location 51.583N 178.200W
Depth 40 km
Distances
112 km (70 miles) WSW (253 degrees) of Adak, AK
282 km (175 miles) WSW (258 degrees) of Atka, AK
2026 km (1259 miles) WSW (251 degrees) of Anchorage, AK
Location Uncertainty Horizontal: 14.4 km; Vertical 7.5 km
Parameters Nph = 715; Dmin = 110.4 km; Rmss = 1.16 seconds; Gp = 51°
M-type = Mwp; Version = 7
Event ID us c000cwni
For updates, maps, and technical information, see:
Event Page
or
USGS Earthquake Hazards Program

National Earthquake Information Center
U.S. Geological Survey
neic.usgs.gov...

I don't have a text to copy for the Tanaga volcano area just yet. Will post in a few
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EDIT

Dthischas been downgraded to 6.4
edit on 26-9-2012 by violet because: (no reason given)




posted on Sep, 26 2012 @ 10:47 PM
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Scrap this one they're the same
Apologies


6.4
29 km SSW of Tanaga volcano

4:39 PST
9.9 km depth




TA where are you ?!
I didn't see this posted unless in wrong forum


Is this of any concern this EQ being near volcano chain?

No tsunami warnings by the way.
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ETA
I also just made a thread for one in gulf of California.

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posted on Sep, 26 2012 @ 10:59 PM
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posted on Sep, 26 2012 @ 11:11 PM
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CORRECTION

A news report is saying these aren't two but one that was downgraded from 6. 9 to 6.4 .
The confusion is from the info coming off separate feeds and not syncing . The locations should sync as well so as not to confuse
Apologies I will fix the title



A strong preliminary 6.9 magnitude earthquake, later revised to a 6.4 magnitude, struck near Adak, Alaska in the Aleutian Islands on Wednesday afternoon, but a damaging tsunami was not expected.

The USGS reported that the quake struck at 3:40 p.m. local time at a depth of 25 miles. The epicenter was 21 miles south of the Tanaga Volcano in Alaska in the Aleutian Island chain and 80 miles southwest of Adak, Alaska.

The West Coast and Alaska Tsunami Warning Center said that based on the earthquake magnitude, location, and historic tsunami records, a damaging tsunami was not likely along the California, Oregon, Washington, British Columbia, or Alaska coastlines. Some areas could experience non-damaging sea level changes though.


© 2012 Microsoft Corporation© 2012 Nokia
Location: Adak, Alaska
51.88000869751 ; -176.65757751465
At this time, no watches, warnings, advisories were in effect.

Earthquakes are not uncommon in this region where the Pacific plate subducts into the mantle beneath the North America plate. This subduction is responsible for the generation of the Aleutian Islands and the deep offshore Aleutian Trench.

The USGS points out that most of the seismicity along the Aleutian arc results from thrust faulting that occurs along the interface between the Pacific and North America plates, extending from near the base of the trench to depths of 40 to 60 km. Slip along this interface is responsible for generating devastating earthquakes. (Source: USGS)
Source
..
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posted on Sep, 27 2012 @ 04:47 PM
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The following is my opinion as a member participating in this discussion.

No worries, violet. Quite often we see reports coming in of two quakes when there's only one. Or an agency says it's such-and-such a magnitude and another has it a few points higher or lower. It can get pretty confusing.


And then there's the teleseisms which can result in a quake getting reported in a place that didn't really have one: some localized seismos picked up one from many miles away but the software calculated it as local. (These errors usually get deleted pretty quickly once they're review by a seismologist.)

Big quakes can really confuse things. After the huge Japan quake in March last year, the Pacific Northwest Seismic Network's VLA got so swamped by the aftershocks for a few days that their local data from ETS episodes was practically impossible to read and they simply had to scrap it.

So, whenever we get conflicting or multiple-quake reports coming in, it's best to wait a little while until the various agencies figure out what their auto-detectors are really picking up. Then, once they've sorted it all out and done their revisions, things tend to make sense.

Usually!


Best regards,

Mike

As an ATS Staff Member, I will not moderate in threads such as this where I have participated as a member.





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