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The UCB moment tensor solution for the NC fault comes out with
strike = 321, dip 89, rake 168
Moment 3x10^26 dyne-cm
Mw 7.2
Peggy
CISN reports a magnitude 6.8 to 6.9 earthquake on the Hayward Fault.
We are assessing damage.
We are also re-evaluating our ability to send people and instruments to Southern California from Menlo Park.
I calculated ShakeMaps for an appoximation of the rupture from UCERF2 on Puente Hills, magnitude 7.05. See attached. All 4 NGA's were used and averaged, maps are for PGA, PGV, SA 1 sec, and SA 3 sec. A CyberShake map will follow shortly.
PASSCAL Standing Committee is about to become aware of the scenario quakes. We will respond with info about available resources shortly
We need to know from IRIS/PASSCAL what seismological instruments/resources are available and how to get them. Getting that information on the earthquake response website is critical. Richard Allen is online with the PASSCAL Standing Committee, and can help make sure that happens.
On the original post of the Shaw et al. 2002, the location of the upper tup-line of the Montebello Thrust ramp shown by a short dashed line just south of the focal mechanism for the 1994 Whittier Narrows event. Any recon for surface deformation associated with slip on the backthrust would be focused parallel to and just north of the 10 freeway.
Thanks, Jamie, for responding on behalf of seismology. A lot of what we do would depend on the state of the network. It will be important to set scientific priorities. Speaking of which, the PASSCAL Standing Committee is taking place at this moment, and they are working on Flexi-RAMP. I'm sure they'd appreciate input.
Great! Please keep us posted.
Can you give us a clearer idea of where that would surface? Whittier?
(if this was a real event) I am headed to the field with a satellite phone to check to see whether there is any deformation localized at locations I know where the folding above the PHT extends to the surface. I am going to try using a USC vehicle, but ma have to do recon on foot if roads are blocked.
Here is another figure from Shaw et al. 2002 showing the Montebello back thrust
Thanks for posting the map James, and your point on the telecon about the need to get airborne reconnaisance. We need to plan for that.
If this is the PHT, the attached map from Shaw et al. 2002 shows the approximate locations of the up-dip thrust ramp tip-line. this should prove useful as a rough guide in recon for localized surface deformation associated with folding during the eq.
I have designated Ken Hudnut as the Scientific Response Coordinator for this drill (not real!) event in Southern California.
Nancy King is the Event Coordinator.
Gary Fuis will coordinate the ESC effort in Menlo Park in response to this southern California earthquake.
I have designated Ken Hudnut as the Scientific Response Coordinator for this drill (not real!) event in Southern California.
Nancy King is the Event Coordinator.
Gary Fuis will coordinate the ESC effort in Menlo Park in response to this southern California earthquake.
This is a big earthquake and CEPEC is going to need the best information possible on the geometry of the fault - is there surface rupture? Can we constrain the geometry quickly from geodesy or seismology?
Everything ok here at Stanford.
Tom Jordan (and several other SCEC and USGS scientists) are at the UJNR meeting in Japan. I'm going to contact NSF on SCEC's behalf, about the scientific response to the earthquake.
I'm stuck in Nagaoka, Japan. Beroza will be in charge of SCEC response.
We are here at the IRIS PASSCAL Standing Committee meeting discussing RAMP
We're here at USC/SCEC and able to get online and connect via phone line. Cell phone connectivity is limited right now. We're inspecting facilities right now.
SCENARIO EVENT
Please open the attached PDF file at 10:31 a.m. PDT
10:31-10:40 brief description of event; statement of TTX objectives
10:40-10:50 Anne Rosinski will lead r.e. CEPEC & CA Clearinghouse
10:51 expect "inject #2"
10:55 continue discussion
11:30 switch to NorCal scenario #2
The UAVSAR flight lines from the US/Mexico border to about 40-50 km to the north were reflown today (9/28). It will be several weeks before interferograms are processed.
++Eric
We finally got the Envisat D127 data and made a preliminary interferogram. The 7/7 Collins Valley quake is not visible. It may be too deep so surface signal is below noise level.
++Eric