Have been in contact with Beroza, McRaney, and Oskin and activated this site. We are all available to help coordinate response.

The 2013 Golden Guardian Exercise is underway. The California Earthquake Clearinghouse has established a virtual earthquake clearinghouse at: http://www.californiaeqclearinghouse.org/2013-golden-guardian-exercise.

On this site you can view the SpotOnResponse Map, find out the physical location(s) of the Clearinghouse, and learn how to submit important observations. Please explore this site and SpotOnResponse. On Wednesday, May 15, you are invited to actively participate in the exercise and we hope you join the live webinar from 10 am - 1 pm to follow the action. More information about the webinar is available on the virtual clearinghouse site.

For More Information (note new URL) : http://www.californiaeqclearinghouse.org/2013-golden-guardian-exercise-3/

Point of Contact:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Anne Rosinski  PG 7481, CEG 2353
Senior Engineering Geologist
California Geological Survey
345 Middlefield Road, MS 520
Menlo Park, CA 94025
650.688.6373 Fax: 650.688.6329
Anne.Rosinski@conservation.ca.gov
http://www.conservation.ca.gov/cgs
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

- - -

NOTE FROM ANNE:

You do not have to be in northern California to participate in the exercise next week.  Check the  Clearinghouse website starting Monday May 13 for additional updates.
 
CALIFORNIA EARTHQUAKE CLEARINGHOUSE
GOLDEN GUARDIAN EXERCISE
Wednesday, May 15th
10:00 am – 1:00 pm PDT

Dear California Earthquake Clearinghouse member,
 
The California Earthquake Clearinghouse will be participating in the 2013 Cal EMA Golden Guardian Exercise. The purpose of the Clearinghouse exercise is to introduce everyone to the concept of expanded  operations possible through the addition of the virtual Clearinghouse we’re developing using the Unified Incident Command and Decision Support (UICDS) middleware. This year's scenario is a catastrophic San Francisco Bay Area earthquake. The exercise will take place over three days and updates will be posted to the California Earthquake Clearinghouse website throughout the exercise. On May 15, Clearinghouse members will have the opportunity to use data collection tools to share information with the Clearinghouse which will then be displayed on the Clearinghouse website. We will also host a webex running concurrent with the exercise where you can tune in to hear the action narrated live, ask questions and hear from the various Clearinghouse partners (CGS, Cal EMA, USGS, NASA, EERI, Berkeley Seismological Lab, SpotOnResponse) developing the tools you’ll be using. 
 
This is the third of six planned Clearinghouse exercises.  Over the last year we’ve listened to the feedback you’ve provided and continue to refine the SpotOnResponse mobile app being developed for us and we are eager to share with you the latest improvements. We would like to invite you to attend a one-hour training session that will introduce you to the updated SpotOnResponse as well as tell you more about how you can participate in the Clearinghouses activities for Golden Guardian.  The last training opportunity is May 14, 2:00 PDT.  See attachment for details.
 
Please see the attachment for a summary of the exercise and how to participate.
 
 
Anne
Chair, California Earthquake Clearinghouse

Follow up report from Ken Hudnut, Jerry Treiman, Eric Fielding, and John Galetzka
(USGS, CGS, JPL/Caltech & Caltech, respectively)

Subsequent to Ken's initial field survey Eric Fielding derived an interferogram from TerraSAR-X data spanning the period from 9 August to 31 August, 2012. Based on this data we (KH, JT, EF & JG) identified several potential locations of surface displacement in the vicinity of the Brawley swarm and conducted a focused field investigation of at least a dozen of these lineaments on 10 September 2012 to look for surface rupture.  We found surface rupture in one field along the southwest tail of the swarm and indications of triggered slip on the northernmost portion of the Imperial Fault. (see attached document)

The NASA-JPL airborne InSAR system UAVSAR has been covering the Salton Trough since 2009. The most recent flights were in May 2012. The next flight over the area has been pulled forward from the scheduled flights in November to September 25. Unfortunately, the NASA Gulfstream III that carries UAVSAR is in maintenance now and will be doing another mission after that so September 25 is the earliest flight for UAVSAR.

Data from previous UAVSAR flights is available from http://uavsar.jpl.nasa.gov and from the Alaska Satellite Facility at https://vertex.daac.asf.alaska.edu/ 

Anza BSM plots

We've revised our solutions in ftp://sideshow.jpl.nasa.gov/pub/JPL_GPS_Timeseries/BrawleySwarm after improving the analysis strategy (specifically, fixing troposphere to that estimated in static positioning run, rather than estimating both trop and position together in the kinematic run).

Importantly, station P498 is not moving in the East direction.  There is discernable motion in (at least) stations P502, P499, and P495.

Angelyn Moore and Susan Owen, ARIA team

Here is a bit more of an update than posted before:

I checked throughout the epicentral area without finding any evidence of surface rupture. I did visit and speak with people at the geothermal plant near the intersection of Andre and Hovley, called Ormat, and later spoke with people from their main Reno office. I also met the Mayor and City Manager of Brawley and spoke with their engineers, and also talked with several people from Imperial Irrigation District. All of these people had been getting reports from their field personnel and all tried help lead me to anything that might be of interest, but after following all of their helpful leads I still struck out.

I also checked but did not find any fresh evidence of creep on the Imperial, Brawley, Superstition Hills and San Andreas faults. I did not find anything today that looked like fresh cracking, certainly nothing tectonic. I did not find any evidence of liquefaction, and only minor cracking associated with slumping along irrigation water systems.

I haven't yet downloaded photos and type in my notes. Please let me know if you would like more details, e.g., the GPS track file or photos, etc.

Regards,

    Ken

  hudnut@usgs.gov

  cell:  626-672-6295 (text or call)

P.S. - Attached are maps at two resolutions showing my GPS track from today.

here is the P498 solution for August 26.

Update:  Brian Berard of CalEnergy has replied that he and all others will perform evaluations of all their facilities and report back to us if anybody gets any info on surface faulting, liquefaction, ground deformation, etc. so hopefully we'll have more info from them by tomorrow afternoon or so.

Attached is a KML file with the mud pots and also the volcanic and geothermal features, etc. from Lynch et al., BSSA 2008.

Lynch, D.K. and K.W. Hudnut, The Wister Mud Pot Lineament: Southeastward Extension or Abandoned Strand of the San Andreas Fault?, BSSA, Vol. 98, No. 4, pp. 1720–1729, August 2008, doi: 10.1785/0120070252

The document "BSZ_sequence..." is a very useful summary of the history. But the last paragraph contains the most intriguing words:

"but bigger events are possible on the major northwest striking late Quaternary faults in this vicinity. "

Anyone care to be more explicit?

Dave Jackson