Another Bay Area earthquake moments ago. It felt larger than the earlier one but

[Luminous Animal]

I am in a different building in another part of town.

[msongs]

1. maybe they are stalking u nt

[jberryhill]

2. Same mag, same spot - 4.2

[nadinbrzezinski]

3. Stay safe

[nadinbrzezinski]

6. Here is info, hot off usgs site

Magnitude 3.9 - SAN FRANCISCO BAY AREA, CALIFORNIA
2011 October 21 03:16:05 UTC

Details
Maps
Scientific & Technical
Tsunami
Earthquake Details

This is a computer-generated message -- this event has not yet been reviewed by a seismologist.
Magnitude
3.9
Date-Time
Friday, October 21, 2011 at 03:16:05 UTC
Thursday, October 20, 2011 at 08:16:05 PM at epicenter
Location
37.869°N, 122.252°W
Depth
9.6 km (6.0 miles)
Region
SAN FRANCISCO BAY AREA, CALIFORNIA
Distances
2 km (1 miles) E (100°) from Berkeley, CA
5 km (3 miles) ESE (123°) from Albany, CA
5 km (3 miles) NE (41°) from Emeryville, CA
8 km (5 miles) NNW (346°) from Oakland, CA
Location Uncertainty
horizontal +/- 0.2 km (0.1 miles); depth +/- 0.4 km (0.2 miles)
Parameters
Nph= 89, Dmin=1 km, Rmss=0.19 sec, Gp= 29°,
M-type=regional moment magnitude (Mw), Version=4
Source
California Integrated Seismic Net:
USGS Caltech CGS UCB UCSD UNR
Event ID
nc71667591
Did you feel it? Report shaking and damage at your location. You can also view a map displaying accumulated data from your report and others.

And the other


Magnitude 4.0 - SAN FRANCISCO BAY AREA, CALIFORNIA
2011 October 20 21:41:04 UTC

Details
Maps
Scientific & Technical
Tsunami
Earthquake Details

This event has been reviewed by a seismologist.
Magnitude
4.0
Date-Time
Thursday, October 20, 2011 at 21:41:04 UTC
Thursday, October 20, 2011 at 02:41:04 PM at epicenter
Time of Earthquake in other Time Zones
Location
37.856°N, 122.253°W
Depth
8.2 km (5.1 miles)
Region
SAN FRANCISCO BAY AREA, CALIFORNIA
Distances
3 km (2 miles) SE (132°) from Berkeley, CA
4 km (2 miles) NE (53°) from Emeryville, CA
4 km (3 miles) NNW (334°) from Piedmont, CA
7 km (4 miles) NNW (342°) from Oakland, CA
Location Uncertainty
horizontal +/- 0.1 km (0.1 miles); depth +/- 0.2 km (0.1 miles)
Parameters
Nph=258, Dmin=1 km, Rmss=0.17 sec, Gp= 14°,
M-type=regional moment magnitude (Mw), Version=B
Source
California Integrated Seismic Net:
USGS Caltech CGS UCB UCSD UNR
Event ID
nc71667366
Did you feel it? Report shaking and damage at your location. You can also view a map displaying accumulated data from your report and others.
Preliminary Earthquake Report
California Integrated Seismic Net:
USGS Caltech CGS UCB UCSD UNR


On the Hayward by the way

[itsrobert]

18. These are PRECURSORS to the Big One 8+ coming

be ready, be safe, have a plan.

[nadinbrzezinski]

19. That is VERY possible

And being ready is always a good idea.

[MsKandice01]

21. Not really..

The Hayward Fault doesn't produce 8+ earthquakes.

[nadinbrzezinski]

22. But it could not be foreshocks either

That fault as been having quite a bit of activity as I am sure you know.

[MsKandice01]

23. Oh I know...

But that's a very active portion of the fault also. I'm not saying that it can't possibly be a foreshock but from what I understand, the most we can expect from a full rupture of the Hayward fault is about a 7.2.

[nadinbrzezinski]

25. Well that is good

I gotta worry bout the ones round me, like tecolote, thought to be capable of a 7.0 on a god day...

It's been bewy, bewy quiet.

Take care.

:hi:

And let's hope it's nothing even if in geologic times both will go.

[RandySF]

4. Tonight's was worse.

[Luminous Animal]

14. It felt worse. Two 4.2 earthquakes in one day. Pretty freaky.

My poor husband is tracking down all the flashlights... making sure we have water. After the '89 earthquake, he slept in his clothes for 2 weeks with a flashlight clutched in his hand and every time the upstairs neighbor walked around above us, he'd jump out of bed and shine the light in my face, wake me up and yank me out of bed.

He's sighing with worry like crazy right now. I've a feeling it is going to be a long restless night!

[scorpiogirl]

5. I felt it here in Dublin.

Ugh.

[madinmaryland]

7. Apparently there is fracking going on out there. That seems to be the latest

reason for eq's.

:shrug:

[jberryhill]

27. It couldn't possibly be that it is in the most active fault area in the contiguous US

[FarCenter]

8. Two calls for three...

[nadinbrzezinski]

10. Four per usgs

[RandySF]

9. I'm no geologist, but...

I think the Hayward Fault is about to go.

[nadinbrzezinski]

11. It was on top of the other

The earlier one was 3.9, this was 4.0. Posted both events above.

[MsKandice01]

13. Don't say that...

[dogknob]

12. We were in bed...

... my wife said "I think it's the big one."

I said "Thank you very much" :bounce:

[nadinbrzezinski]

15. Thanks for the laugh

That's a classic

[pennylane100]

30. that was the funniest thing I have heard in a really bad news day.

[zappaman]

31. well, quadaffi(sp) getting what was coming to him is pretty good news! n/t

[wryter2000]

16. I think it's an aftershock

It didn't feel nearly as strong as the first one. The first one came in two waves. The second wave was really, really strong.

[RandySF]

17. My kid had an earthquake drill today

He got down and put his hands over his head.

[Control-Z]

20. I've never been more sure

the world was coming to an end than when the second earth quake hit So Cal the day of the Landers/Big Bear quakes in 1992. They were very large quakes. One quake alone has never made me feel so terrified.

Stay safe up there.

[MsKandice01]

26. I remember that day...

I was living in Chino Hills at the time. That was a scary day.

[cherokeeprogressive]

28. Lived in Norwalk then, Big Bear now. Possibly the scariest day of my life.

My Big Bear friends thought the mountain was collapsing and the world was ending.

[sakabatou]

24. I think I felt it too

Either that or it's my pulse.

[dana_b]

29. I have been in Berkeley today

walked by Occupy Berkeley - the damn earthquakes were centered at UC Berkeley. I'm a little "shaky", as you can imagine.