Quake Watch 2011

Magnitude
4.4
Date-Time
Tuesday, March 01, 2011 at 02:19:46 UTC
Monday, February 28, 2011 at 06:19:46 PM at epicenter
Location
38.814°N, 122.819°W
Depth
2.6 km (1.6 miles)
Region
NORTHERN CALIFORNIA
Distances
2 km (1 miles) NNW (329°) from The Geysers, CA
9 km (5 miles) WSW (254°) from Cobb, CA
12 km (7 miles) WNW (292°) from Anderson Springs, CA
17 km (11 miles) E (85°) from Cloverdale, CA
42 km (26 miles) NNW (346°) from Santa Rosa, CA
121 km (75 miles) NNW (343°) from San Francisco City Hall, CA
Location Uncertainty
horizontal +/- 0.1 km (0.1 miles); depth +/- 0.2 km (0.1 miles)
Parameters
Nph= 67, Dmin=1 km, Rmss=0.07 sec, Gp= 25°,
M-type=regional moment magnitude (Mw), Version=4
Source
California Integrated Seismic Net:
USGS Caltech CGS UCB UCSD UNR
Event ID
nc71530230


a big one for The Geysers

earthquake.usgs.gov...

[atsimg]http://files.abovetopsecret.com/images/member/542c142f81c6.jpg[/atsimg]

reply to post by aorAki


I want you to know I've thought about your words today several times. I remain silent and think of you. I want you to know that I'm sure many more are doing the same.

reply to post by aorAki


So sorry for your loss.
Thank you for the link to Dr Quigley's page. I will have a read of that soon.

As you're at the uni there, do you know of any studies being done about the environmental affects of the quake?
I have to do a GIS project for uni and am thinking of looking into this area. (it has to be environmental & and I want to do something about the quakes...any suggestions would be appreciated as I haven't been to NZ).

@ Muzzy. thanks for your info. Well done.

A quake just happened in western Texas...mag 3.0

reply to post by aorAki


So sorry to hear about your friend, and all the others as well. It's a brand new day in a new journey for them now. May the wind blow their spirits to a place that is good and a new sun shine down on them in a field full of flowers blowing softly in the wind and all is good. So Mote it Be!

reply to post by ButterCookie


Good catch, and what a odd place, eh?

This event has been reviewed by a seismologist.
Magnitude 3.0
Date-Time Tuesday, March 01, 2011 at 03:30:11 UTC
Monday, February 28, 2011 at 09:30:11 PM at epicenter
Time of Earthquake in other Time Zones

Location 32.727°N, 100.777°W
Depth 3.8 km (2.4 miles)
Region WESTERN TEXAS

Distances 10 km (6 miles) N (351°) from Hermleigh, TX
13 km (8 miles) E (84°) from Snyder, TX
32 km (20 miles) WSW (244°) from Rotan, TX
45 km (28 miles) NW (310°) from Sweetwater, TX
102 km (63 miles) WNW (288°) from Abilene, TX
373 km (232 miles) W (270°) from Dallas, TX

added: and good job posting that over at the Arkansas thread. Just got the kids down, looked at USGS, and came flying over here first, and then went there. What quick fingers you have!

The link after the quake post shows the historical seismicity in this area, which looks substantial. I checked because this seemed out of place to me for a quake, but it is actually common here.

Magnitude 5.2
Date-Time Tuesday, March 01, 2011 at 03:46:29 UTC
Tuesday, March 01, 2011 at 02:46:29 AM at epicenter
Time of Earthquake in other Time Zones

Location 5.583°S, 11.378°W
Depth 10.3 km (6.4 miles)
Region ASCENSION ISLAND REGION
Distances 421 km (261 miles) NE of Ascension Island
1746 km (1084 miles) SW of ACCRA, Ghana


neic.usgs.gov...

reply to post by berkeleygal


4.5Mw now.

Even though that quake is only 0.2 magnitude smaller than yesterdays Arkansas 4.7 the PGV (Peak Ground Velocity) was more than twice the speed. 5.4cm/sec versus 2.4cm/sec
PGV Geysers
PGV Arkansas

(for those not sure what it means the list is Longitude, latitude, cm/sec)

Therefore one would assume the damage would have been twice as much

Hey you guys, looking for some input on reading this seismo strip from GEE. This is a screen shot I took of GEE from the arkansas area. I zoomed in on it because it was so odd.

First, here it is at the 'normal' setting: (scroll to the right for the most pronounced spikes)




Here it is zoomed in:





This was showing up on several stations. What do you think?

Reminds me of radio interference. I posted a wavy seismo last week but I don't remember which thread.
Nobody said what they thought it meant so hopefully someone will be able to answer you.

# Reference Number: 3472164
# NZDT: Tue, Mar 1 2011 10:07 pm
# Magnitude: 4.5
# Depth: 40 km
# Details: 20 km north-west of Wellington

www.geonet.org.nz...

Those poor people who have evacuated to Wellington. They would be on edge all over again.

Just a little Alaskan Aleutian action to start the day.

Magnitude 5.4
Date-Time Tuesday, March 01, 2011 at 12:50:00 UTC
Tuesday, March 01, 2011 at 02:50:00 AM at epicenter
Time of Earthquake in other Time Zones

Location 51.235°N, 179.513°E
Depth 47.7 km (29.6 miles)
Region RAT ISLANDS, ALEUTIAN ISLANDS, ALASKA

earthquake.usgs.gov...

Originally posted by zenius
# Reference Number: 3472164
# NZDT: Tue, Mar 1 2011 10:07 pm
# Magnitude: 4.5
# Depth: 40 km
# Details: 20 km north-west of Wellington
www.geonet.org.nz...
Those poor people who have evacuated to Wellington. They would be on edge all over again.

Absolutely if they were wanting to get away from earthquakes Wellington sure ain't the place to go

Felt that one
Had just got to sleep (I guess) and woke to the sound of the big mirror on the bedroom dresser rattling, I think I missed the main quake though, probably the rattling was the S wave. Just felt vibrations for a about 10 seconds.

I added this quake to a KMZ file I did back in 2009 with historical 5+ quakes in the Wellington/Cook Strait/Kaikoura/ZeehaensBight area. Doesn't include the Wairarapa and the 1855 Mag 8.0 on the western shores of Lake Wairarapa, but does have Mag 4's for the Wellington city and suburbs
KMZ CookStrait for Google Earth

It didn't convert to Google Maps every well, the icons are too big.

edit: Oh yeah, the highest PGV (Peak Ground Velocity) recording for that was at Frank Kitts Park right in the city, at 0.76483cm/sec (just a tiddler)

correction on post by muzzy

The PGV (Peak Ground Velocity) was higher at ARKS Wainuiomata Arakura School at 1.00428cm/sec

I don't know if I missed this when I first looked at it or it has been added in since, its on the opposite side of Wellington Harbour and behind the first set of hills, not where you'd expect the highest reading to be.
Lot more to this Velocity reading than I thought, unfortunately Geonet don't provide a list like USGS does, you have to look at the Shake Map and turn on PGV to see them.
www.geonet.org.nz...

Can someone with expertise tell me whether or not Southeastern Michigan is "safe" when and if something very major happens along the New Madrid fault line?

Thanks,

TIWWA

California had better start hanging on,, incoming, very shallow,, hang on.

reply to post by BobAthome


The last I saw were two 2.'s, San Francisco - are these the ones or is it a larger one?

reply to post by yahfearing


I call Hoax,, anyway lets keep on topic,, now about those califoria quakes,, i believe that they will begin too intensifie.