Quake Watch 2012, page 43
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reply posted on 13-2-2012 @ 05:38 PM by Olivine
reply to post by zworld


Hi zworld. Those top 2 quakes you posted are from The Geysers area. It's the largest geothermal facility in the world. That's why it has so many quakes daily. It is also above the hypothosized slabless window. So the heat is close to the surface. I believe the 4.3 you listed is on the high side magnitude-wise, for the area.

How you doing after the big shake? The background "noise" on the spectrograms and seismos I've been following in your area haven't quieted down yet--keep safe.
edit on 2/13/2012 by Olivine because: spelling


ETA: Sorry 'bout that, Puterman. Didn't see you already had mentioned the Geysers.
edit on 2/13/2012 by Olivine because: (no reason given)



reply posted on 13-2-2012 @ 05:46 PM by Olivine
reply to post by PuterMan


Heeelllo Puterman

I was looking at the spikey ones @ 19:07 and 19:08 UTC. The one at 17:44:20 looks earthquakish too, but I was wandering around then--didn't feel anything.
So the ones that look like trains; any chance those could be small shakes from way out to sea? Like maybe Mag 3"s from the Mid-Atlantic Ridge? I've been searching for seismos in near real-time near the ridge with no luck. You have any favorites in that humongous area?
edit on 2/13/2012 by Olivine because: more spelling issues



reply posted on 13-2-2012 @ 05:47 PM by PuterMan
reply to post by Olivine


Sorry, just added to my other post - trains. See the bottom of the previous page. Track is 3.36 miles and curves round past the station.


Closest to the MAR are PM.ROSA and II.CMLA (The are almost on it)

IU.BBSR is about half way there
edit on 13/2/2012 by PuterMan because: (no reason given)



If I was the PNSN I would say those were military jets breaking the sound barrier, and if I was the PNSN I might be right because the sure don't sound like earthquakes.



Sound in a few minutes - look back in this post.

edit on 13/2/2012 by PuterMan because: (no reason given)


dl.dropbox.com...

Sorry has to be a zip because of ATS T & C.
edit on 13/2/2012 by PuterMan because: (no reason given)




reply posted on 13-2-2012 @ 06:22 PM by PuterMan
reply to post by Olivine


I believe the 4.3 you listed is on the high side magnitude-wise, for the area.


Larger but certainly not unknown

There is a list of counts quakes to 2010 on the second page.

www.scribd.com...


reply posted on 13-2-2012 @ 07:06 PM by Olivine
Puterman, your right, those are strange sounding earthquakes.

Nice find on the link about The Geysers' earthquakes. I couldn't remember ever seeing a Mag 5 or larger in that immediate area, and skimming your link, they don't seem to happen (well not in recent times)

Looking at the focal mechanism given for todays Mag 5.6 near Weitchpec, it looks to be a normal-type fault (extensional). I compared the location with some of my geological maps of the area, and the epicenter given is nearly on top of a long, very old fault (the South Fork fault) from the Jurassic (the exact age is still being debated but safely put at 120-140 Mya (Mya = millions of years ago--when exotic terranes were still attaching to the west coast).
Here is a link to the USGS -- styles of faults page. It has pics of the different types of faults.

Todays quake is most probably related to the subduction zone and all of its accumulated stress, but the normal style of faulting doesn't make me think this was a plate interface quake. Also factoring in the depth of almost 33km, when the estimated plate interface depth at that location is very close to 20km, leads me to think todays quake originated in or possibly below the subducting slab.
edit on 2/13/2012 by Olivine because: (no reason given)
edit on 2/13/2012 by Olivine because: add a link
edit on 2/13/2012 by Olivine because: spelling



reply posted on 13-2-2012 @ 08:23 PM by berkeleygal
Final upgrade on the Cali quake

Magnitude
5.6
Date-Time
Monday, February 13, 2012 at 21:07:02 UTC
Monday, February 13, 2012 at 01:07:02 PM at epicenter
Time of Earthquake in other Time Zones
Location
41.143°N, 123.790°W
Depth
28.2 km (17.5 miles)
Region
NORTHERN CALIFORNIA
Distances
9 km (5 miles) SW (234°) from Weitchpec, CA
28 km (17 miles) NNW (343°) from Willow Creek, CA
29 km (18 miles) ENE (67°) from Westhaven-Moonstone, CA
50 km (31 miles) NE (38°) from Eureka, CA
349 km (217 miles) NW (326°) from Sacramento, CA
Location Uncertainty
horizontal +/- 0.4 km (0.2 miles); depth +/- 1.2 km (0.7 miles)
Parameters
Nph= 47, Dmin=20 km, Rmss=0.27 sec, Gp= 72°,
M-type=regional moment magnitude (Mw), Version=8
Source
California Integrated Seismic Net:
USGS Caltech CGS UCB UCSD UNR
Event ID
nc71734741


earthquake.usgs.gov...

aftershock

Magnitude
2.8
Date-Time
Tuesday, February 14, 2012 at 00:19:07 UTC
Monday, February 13, 2012 at 04:19:07 PM at epicenter
Time of Earthquake in other Time Zones
Location
41.152°N, 123.785°W
Depth
32.7 km (20.3 miles)
Region
NORTHERN CALIFORNIA
Distances
8 km (5 miles) WSW (238°) from Weitchpec, CA
29 km (18 miles) NNW (344°) from Willow Creek, CA
30 km (19 miles) ENE (65°) from Westhaven-Moonstone, CA
51 km (32 miles) NE (38°) from Eureka, CA
350 km (217 miles) NW (326°) from Sacramento, CA
Location Uncertainty
horizontal +/- 0.2 km (0.1 miles); depth +/- 0.6 km (0.4 miles)
Parameters
Nph= 22, Dmin=20 km, Rmss=0.05 sec, Gp= 76°,
M-type=duration magnitude (Md), Version=3
Source
California Integrated Seismic Net:
USGS Caltech CGS UCB UCSD UNR
Event ID
nc71734806


earthquake.usgs.gov...


And this is no where near the Geysers!




reply posted on 14-2-2012 @ 03:33 AM by PuterMan
reply to post by diamondsmith


That will be going up I think. I am guessing 6.7

Are you posting direct from the USGS page. Just wondering why your text as always so difficult to read and always starts with the word text.


reply posted on 14-2-2012 @ 03:36 AM by diamondsmith
reply to post by PuterMan
Sorry P Man I try to be fast,but I promise I will improve and I will align it as it should be.




reply posted on 14-2-2012 @ 04:35 AM by MoorfNZ
reply to post by murkraz


And then the Costa Rica event further south still... *gulp*
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