3.7 San Francisco Bay area

As a resident of and having family in both the San Francisco and Los Angeles areas, I watch local (California/West Coast) quake activity pretty closely.

For the record, it is unusual to have a quake over 3 in this area - we only get a 3+ in this region (Contra Costa/Solano/Sacramento Counties) very, very occasionally:

[link to earthquake.usgs.gov]


p.s. don't mind the 1-star bandit

thanks, Jane

I watch the quakes closely too, and I know that is a fairly large quake for the area. Shallow, too!

Stop posting these weak as piss EQ's Maddame!!!!!

See you down in Arizona Bay... Learn to swim!!!

I think if i lived in Missouri,
I'd keep a close eye on EQ's too! ;-`)

3.7 in USA moment Magnitude is a 4.3 +/- 0.1 (Richter Scale) anywhere else in the world. This is why it felt strong !

5*

Power outage now in Daly City.
On breaking news. Coincidence?
Or related?

That's interesting! I wondered why this quake has been described as hitting with a jolt.

These men go so far to say:

Earthquake just felt in vallejo hard 3 second roll felt harder than and 89
[link to twitter.com]

and

Damn that was a scary weird earthquake in vallejo!
[link to twitter.com]

Homo-apocalypse!

As previously mentioned, USGS downgraded this quake to 3.5.


And then they did it again!

There was a second quake this morning in the same area (just across the Interstate from the previous one), initially reported as 3.7 and again downgraded to 3.5.

#1.
Magnitude 3.5
Date-Time Thursday, February 16, 2012 at 02:09:14 UTC
Wednesday, February 15, 2012 at 06:09:14 PM at epicenter
Location 38.077°N, 122.231°W
Depth 9.3 km (5.8 miles)
Region SAN FRANCISCO BAY AREA, CALIFORNIA
Distances 3 km (2 miles) NNW (345°) from Crockett, CA
4 km (2 miles) S (175°) from Vallejo, CA
5 km (3 miles) NW (310°) from Port Costa, CA
31 km (20 miles) N (359°) from Oakland, CA
[link to earthquake.usgs.gov]

#2.
Magnitude 3.5
Date-Time Thursday, February 16, 2012 at 17:13:20 UTC
Thursday, February 16, 2012 at 09:13:20 AM at epicenter
Location 38.078°N, 122.234°W
Depth 8.3 km (5.2 miles)
Region SAN FRANCISCO BAY AREA, CALIFORNIA
Distances 3 km (2 miles) NNW (342°) from Crockett, CA
4 km (2 miles) S (178°) from Vallejo, CA
6 km (4 miles) NNE (25°) from Rodeo, CA
31 km (20 miles) N (359°) from Oakland, CA
[link to earthquake.usgs.gov]

Very unusual:
Thread: Another 3+ hits San Francisco Bay Area, Ca. today. Same area got 3.5 yesterday.

WHere is the 3.5 from yesterday? I only see one on the USGS site..

One was practically on top of the other (literally just on the other side of the freeway), so the second one obscures the first one on the (USGS) maps.

The longitude/latitude locations are posted above

Oftentimes when we do have a m3-4 in the Bay Area, they go unnoticed (likely due to depth), but both of these "little" 3.7's (3.5 per USGS) were felt over a widespread area.

Not everyone (knows to or chooses to) report their reaction of a particular quake to USGS, but I copy/paste the reactions for later reference.

The recent 4.3 near The Geysers only garnered a few hundred replies, even though it was only at a depth of 1.4km:
[link to earthquake.usgs.gov]

This pair of 3.7's received more reaction. This might be due to population, or because both of these smaller quakes were felt as a jolt:

#1.
[link to earthquake.usgs.gov]

#2.
[link to earthquake.usgs.gov]

Thread: My friend just felt the 3.7 EQ in California pretty strong

For people who say "earthquakes happen everyday in California," yes they do, but those are minor (less than 2.9). The frequency of anything over 3.0 is staggered, and February 2012 has been a "big" month.

If anyone can find a running list of 3.0 and over in California, I'd sure appreciate the link (not just the 7 day list USGS provides, I'm looking for a historical list).

In the meantime, here is the activity over 3.0 in BOTH California and Nevada, just this (busy) month (compiled from screencaps of this USGS page*). I'll try to come back later and update geography (i.e. Northern, Central or Southern California). The purpose being to illustrate some increased activity of quakes over 3.0.

2/01 06:40:31 3.5 Wells, NV
2/01 11:05:05 3.4 Brawley, CA
2/02 18:38:49 3.0 Cartago, CA
2/03 none
2/04 13:36:28 3.0 Pinnacles, CA
2/05 none
2/06 none
2/07 16:30:47 3.3 (originally 3.4) Avalon, CA
2/07 20:16:24 3.4 Trinity, NV
2/08 none
2/09 07:06:08 3.0 San Juan Bautista, Ca
2/09 13:58:34 3.0 Petrolia, CA
2/10 none
2/11 13:58:35 3.0 Petrolia, CA
2/12 01:46:47 3.0 Niland, CA
2/12 02:27:38 3.0 Ocotillo, CA
2/12 12:27:49 3.0 (LATER DELETED) Coso Junction, CA
2/12 14:32:59 Cape Vizcaino, CA
2/12 20:47:12 4.3 Anderson Springs, CA
2/13 13:07:02 5.6 (originally 5.3, then 5.5) Weitchpec (Eureka), CA
2/14 02:09:28 4.9 (originally 5.1) Guadalupe Victoria, Baja CA, Mexico
2/14 05:05:29 3.0 Borrego Springs, CA
2/14 11:35:55 3.5 Guadalupe Victoria, Baja CA, Mexico
2/15 18:09:14 3.5 (originally 3.7) Crockett, CA
2/16 09:13:20 3.5 (originally 3.7) Crockett, CA

* [link to earthquake.usgs.gov]

California will feel the wrath of God soon..

Prepare for a very large Earthquake!

There will be three, actually. Then a big one in Seattle. Then another Cal quake after that.

Devastating it will be...