Quake Watch 2011

reply to post by this_is_who_we_are


According to USGS

Aftershocks are earthquakes that follow the largest shock of an earthquake sequence. They are smaller than the mainshock and within 1-2 rupture lengths distance from the mainshock. Aftershocks can continue over a period of weeks, months, or years. In general, the larger the mainshock, the larger and more numerous the aftershocks, and the longer they will continue.

The key may be the "1-2 rupture lengths", see the map

Magnitude
3.4
Date-Time
Friday, February 25, 2011 at 08:12:51 UTC
Friday, February 25, 2011 at 12:12:51 AM at epicenter
Location
37.294°N, 122.686°W
Depth
5.1 km (3.2 miles)
Region
OFFSHORE NORTHERN CALIFORNIA
Distances
29 km (18 miles) SW (230°) from Half Moon Bay, CA
30 km (19 miles) SSW (211°) from Moss Beach, CA
30 km (19 miles) SW (219°) from El Granada, CA
44 km (27 miles) SW (229°) from San Mateo, CA
48 km (30 miles) SSW (204°) from Daly City, CA
58 km (36 miles) SSW (204°) from San Francisco City Hall, CA
Location Uncertainty
horizontal +/- 0.7 km (0.4 miles); depth +/- 0.9 km (0.6 miles)
Parameters
Nph=100, Dmin=31 km, Rmss=0.24 sec, Gp=184°,
M-type=local magnitude (ML), Version=2
Source
California Integrated Seismic Net:
USGS Caltech CGS UCB UCSD UNR
Event ID
nc71528410

earthquake.usgs.gov...

odd place

earthquake.usgs.gov...

hmm that didn't work too well - first attempt too at notifying ! a 5.7 Vera Cruz Mexico, but c. 140 depth.

Just had a small quake in central California and went to USGS and noticed I think that it was right on the fault line at 2.6km in depth is that bad on the line like that? Has anyone noticed a lot going on in that area by San Fran and North California lately or is it just me?earthquake.usgs.gov...

reply to post by yahfearing


Pretty shallow !
But I'd say any small quake along there is OK, helps relieve the stress buildup.
Like the NZ scenario I'd say the San Andreas is a fault wher if there is NOTHING happening, thats the time to be concerned.

Iceland going crasy with activity near our capital, reporting it in this Thread

reply to post by Spacedman13


Hey Spacedman13, I just posted this map on the other thread, comparing it with the map from yesterday. It does visually look to be very alarming to me, so I hope some of the experts around here can help to figure this out.

This is from the last 30 minutes.

[atsimg]http://files.abovetopsecret.com/images/member/36e562189c11.png[/atsimg]

This event has been reviewed by a seismologist.
Magnitude 6.0
Date-Time Monday, February 28, 2011 at 01:29:26 UTC
Sunday, February 27, 2011 at 10:29:26 PM at epicenter

Location 37.164°S, 73.121°W
Depth 16.7 km (10.4 miles)
Region BIO-BIO, CHILE
Distances 37 km (23 miles) S (190°) from Concepcion, Chile
181 km (112 miles) NNW (347°) from Temuco, Chile
229 km (142 miles) SW (214°) from Talca, Chile
464 km (288 miles) SSW (208°) from SANTIAGO, Chile

Location Uncertainty horizontal +/- 22.9 km (14.2 miles); depth +/- 1.2 km (0.7 miles)
Parameters NST=220, Nph=221, Dmin=455.3 km, Rmss=0.72 sec, Gp=101°,
M-type="moment" magnitude from initial P wave (tsuboi method) (Mi/Mwp), Version=C
Source U.S. Geological Survey, National Earthquake Information Center:
World Data Center for Seismology, Denver

Event ID usb0001lmt

USGS

This event has been reviewed by a seismologist.
Magnitude 4.4
Date-Time Monday, February 28, 2011 at 00:55:04 UTC
Monday, February 28, 2011 at 07:25:04 AM at epicenter
Time of Earthquake in other Time Zones

Location 20.007°N, 95.316°E
Depth 112.3 km (69.8 miles)
Region MYANMAR
Distances 111 km (69 miles) SSW of Meiktila, Myanmar
199 km (123 miles) WSW of Taunggyi, Myanmar
365 km (227 miles) NNW of YANGON (Rangoon), Myanmar
886 km (550 miles) NW of BANGKOK, Thailand

Location Uncertainty horizontal +/- 27.4 km (17.0 miles); depth +/- 8.9 km (5.5 miles)
Parameters NST= 21, Nph= 22, Dmin=288.3 km, Rmss=0.29 sec, Gp=133°,
M-type=body wave magnitude (Mb), Version=5
Source USGS NEIC (WDCS-D)


Event ID usb0001lmq

USGS

Bingo ,,bongo,, bio-bio,, yup

reply to post by UtahRosebud

A member posted on this thread (I think) the other day wanting to know
what was going on in Bio Bio Chile. I will back track on the pages and
see if I can find who it was.

Significant quake

reply to post by BobAthome


Bob I am replying to the post a few pages back where you said you were worried about Bio Bio Chile. As you see they did have a quake today. Hope all is well with you, family and friends. Hoping you check in.

reply to post by crazydaisy


And a member , mentioned he normaly kept track of Chile but had not lately,because he was from nz i think?

reply to post by BobAthome


wow some prediction... LOL why were you worried about Chile Bob.

hope this activity the earth is having will calm don soon but that doesnt seem likely right now just a bad feeling this year.

6.0 just hit Chile

earthquake.usgs.gov...

5.0 2011/02/28 02:03:27 32.330 142.371 33.5 IZU ISLANDS, JAPAN REGION
5.0 2011/02/28 02:03:18 -17.680 -173.940 33.9 TONGA


Same Mag, same time (almost), same depth (almost)

weird

MAP 5.8 2011/02/28 01:29:26 -37.268 -73.296 20.0 BIO-BIO, CHILE



Downgraded to 5.8.

reply to post by BobAthome


Chile is all up to date till end of 27th Feb.
I can only update it once a day (at the end of UTC) because its done manually
So that 5.9 won't show till tommorrow.
seabreeze.wordpress.com...

BTW the Chileans gave it a 5.9ML
www.sismologia.cl...