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  • baagaard
    2012.08.26 - Swarm near Brawley, California   10 years 4 weeks ago

     

  • baagaard
    2012.08.26 - Swarm near Brawley, California   10 years 4 weeks ago

     

  • huynht
    2012.08.26 - Swarm near Brawley, California   10 years 4 weeks ago

     Circulated by Egill Hauksson (Caltech).

  • jmcguire
    2012.08.26 - Swarm near Brawley, California   10 years 4 weeks ago

    Thanks Joanne,  It would be the Ormat Brawley North plant that

    is relevant.   I don't know anything about that plant, but most in

    the salton trough have to report the seismicity in their region to DOGGR.

    Hence they run local networks, such as the Cal Energy data from further north

    that is now archived at CalTech.

     

    The attached google earth capture shows where the plant is as "A". It's

    about 1km from the epicenter of the M5.5.   I don't know anything about

    their well locations, but presumably they are within a few hundred meters

    of the plant.  I think it would be great if SCEC as an organization was pro-active about

    making sure the local data gets archived somewhere if it exists.  This did not happen for

    the 2005 swarm under the Cal Energy plants and that was a major missed opportunity.

  • ybock
    2012.08.26 - Swarm near Brawley, California   10 years 4 weeks ago

    We've posted real-time GPS displacement waveforms data at anonymous ftp://dozer.ucsd.edu/pub/public/IVSwarms2012-08-26. A page will be set up on the NASA MEaSUREs GPS Explorer portal later today with this an other information.

    A glitch in our system, precluded transfer of waveforms to SCEDC waveform pool and conversion to seismic formats (MSeed and SAC) right after the events. They will be uploaded later.

    -- Yehuda Bock

  • rolohman
    2012.08.26 - Swarm near Brawley, California   10 years 4 weeks ago

    Screenshot with TerraSARX coverage and dates

  • stock
    2012.08.26 - Swarm near Brawley, California   10 years 4 weeks ago

    This contact info for Cal Energy and for Ormat is from 2009. USGS Menlo Park folks (Fuis?) may have more updated info. What, exactly, would be the plan if somebody contacts them? (Is there going to be some coordinated effort to contact them?) 

    Cal Energy Operating Co.
    551 W Main St # 1
    Brawley, CA 92227
    760-351-3050
    760-351-3058 Fax

    Cal Energy Operating Co.
    7030 Gentry Road
    Calipatria, CA 92233
    Brian Berard, Geoscience Manager
    (760)348-4084
    (760)348-4024 fax
    brian.berard@calenergy.com

    Cal Energy Operating Co.
    7030 Gentry Road
    Calipatria, CA 92233
    Mark Chastain, Well Field Maintenance Coordinator
    (760)348-4053
    (760)348-4024 fax
    Mark.chastain@calenergy.com

    Bob Sullivan
    Project Manager
    Ormat Nevada Inc.
    North Brawley Geothermal Project
    P.O. Box 1807
    4780 Highway 111
    Brawley, CA 92227
    760-351-8555
    bsullivan@ormat.com

     

  • fielding
    2012.08.26 - Swarm near Brawley, California   10 years 4 weeks ago

    TerraSAR-X (TSX) has an 11-day repeat cycle, which helps enable acquisitions sooner, but unfortunately the German data security laws mandate 5-day delay after acquisition for full-resolution data. 

    We will see if the TSX data acquired over this area previously can be included in the Los Angeles Supersite to make data access easier.

  • baagaard
    2012.08.26 - Swarm near Brawley, California   10 years 4 weeks ago

     Attached please find v.1 talking points for today's activity, for open distribution

     Please post to NEIC and SCEC pages, etc. The figure includes event mechanisms for the largest 2 events. More later. Please feel free to send questions, corrections, etc. so that we can incorporate those into v.2 later. Thank you,  Ken

     

    office phone:  626-583-7232

    cell phone:  626-672-6295

    email:  hudnut@usgs.gov

  • baagaard
    2012.08.26 - Swarm near Brawley, California   10 years 4 weeks ago

     Attached are Google Earth files with seismicity (ANSS catalog is updated daily and real-time is every 5min I think, Hauksson-Shearer) and USGS fault surface traces.

  • ybock
    2012.08.26 - Swarm near Brawley, California   10 years 4 weeks ago

    Its's not that exciting nor worth a map. One site, P499 (nearest the epicenter) has significant coseismic motion for the second event (M=5.4 @ 20:57:18 UTC) with a precision of about 5 mm - the north displacement is +20 mm in the east and -10 mm in the north. Peak displacement is about 100 mm at that one site in the east, and 30 mm in the north. Dynamic motions can also be seen at about 6 other stations. We will post the waveforms.

    --Yehuda

  • beroza
    2012.08.26 - Swarm near Brawley, California   10 years 4 weeks ago

       Well that's interesting.  Can you post a map?

  • rolohman
    2012.08.26 - Swarm near Brawley, California   10 years 4 weeks ago

    A couple months ago, we submitted a request for TerraSAR -X acquisitions spanning Brawley - I am checking now to see if any of those had been implemented yet, but some encouraging news is that we had to change our requested track/angle because the area due west was already being acquired.

     

    Update:

    There are at least 4 acquisitions in the past month covering the area, including two over the same track.  So the prospects for a reasonable interferogram are very good.

  • ybock
    2012.08.26 - Swarm near Brawley, California   10 years 4 weeks ago

    We've computed GPS displacement waveforms for the two largest events: at 19:31 and 20:57. There is about 1.5 cm of East motion at a few stations nearest the epicenters.

    --Yehuda

  • minster
    2012.08.26 - Swarm near Brawley, California   10 years 4 weeks ago

    See also:

    http://en.wikipedia.org/wiki/1979_Imperial_Valley_earthquake

    ecf.caltech.edu/~heaton/papers/Imperial%20New%20River.pdf

     

  • minster
    2012.08.26 - Swarm near Brawley, California   10 years 4 weeks ago

    Actually, Carl Johnson's thesis is a good reference for the 1970s  Bernard

  • jmcguire
    2012.08.26 - Swarm near Brawley, California   10 years 4 weeks ago

    Does anyone have a contact at Ormat Geothermal?  I don't, but their plant is right

    in the middle of the swarm.   Presumably they will get sued for the damage in Brawley. It would be great if SCEC could use this to start some sort of constructive relationship with them to document the evidence for/against induced seismicity in this swarm.   They must have a local monitoring network installed that would be invaluable to get access to the data from.

     

  • jmcguire
    2012.08.26 - Swarm near Brawley, California   10 years 4 weeks ago

    It looks like this one is just south on the big 1981 West Moreland swarm (largest M5.7)

    which lasted about 200 hours

  • archulet
    2012.08.26 - Swarm near Brawley, California   10 years 4 weeks ago

    The Brawley Fault has almost a due North strike, based on its surface expression following the 1979 Imperial Valley earthquake.  This swarm is parallel to the Elmore Ranch Fault and its activity in 1987.

     

  • jmcguire
    2012.08.26 - Swarm near Brawley, California   10 years 4 weeks ago

    Is anyone in the area able to document/rule out a surface trace/scarp

    from this swarm?  That info came in very handy in figuring out what went on in the 2005

    swarm.

     

     

  • beroza
    2012.08.26 - Swarm near Brawley, California   10 years 4 weeks ago

         Looks like it started early this morning.  Questions:  has anyone seen a mechanism yet? what's the history of the Brawley Seismic Zone?

  • hudnut
    2012.05.30-Golden Guardian Exercise   10 years 17 weeks ago

    On the older Iridium sat phones, hold down the zero key until a + pops up on the display, then type in the rest of the number.

  • hudnut
    2012.05.30-Golden Guardian Exercise   10 years 17 weeks ago

    1) The OASIS satellite phone system provided by Cal EMA was 'down' this morning due to interference, but for purpose of the exercise today OASIS will be turned on from 11:00 a.m. - 2:00 p.m. PDT. Please test your OASIS phone system by working through your call-down list, if you have one. If you would like to test OASIS system, please call in to USGS Pasadena at 61005. Thank you.

     

    2) For those with Iridium and other satellite phones, please make test calls to the USGS Pasadena "situation unit" phone. For today's exercise, that phone number is 881651473281. Please call this number to report all key field observations. A person should pick up, record the information you report, and then enter it into the UICDS system that is being demonstrated here today. Thank you.

     

    If you are having trouble with satellite phone checks, please e-mail me at hudnut@usgs.gov or call me on my cell at (626)672-6295 [but, of course, don't count on the cell phone to work for a real event!]

  • mfloyd
    2011.10.23 - M7.2 Eastern Turkey   10 years 39 weeks ago

    Dear colleagues,

    I would like to draw your attention to the following Special Session - convened by Gareth Funning of UC Riverside, Semih Ergintav of TUBITAK MRC in Turkey and me - on the recent Van earthquake for the upcoming SSA Annual Meeting (see http://www.seismosoc.org/meetings/2012/). The meeting will be April 17-19, 2012 in San Diego, California. I hope you have a continued interest in this earthquake, having previously contributed to the Van Supersite, SCEC Response site or been in communication with me directly about the event.

    Please consider submitting an abstract to this session on an important recent earthquake, and please forward this call to your colleagues and collaborators as appropriate. Abstracts are due by January 11, 2012.

    We hope to see you in San Diego in April!

    Regards,
    Mike Floyd

    Postdoctoral Associate
    Department of Earth, Atmospheric and Planetary Sciences
    Massachusetts Institute of Technology
    77 Massachusetts Avenue
    Building 54-812
    Cambridge, MA 02139-4307
    United States of America
    +1 617 253 0950
    http://web.mit.edu/mfloyd/www/

    ---

    The October 23, 2011 Van, Turkey Earthquake:  Observations and Implications

    The October 23, 2011, Mw7.2 Van earthquake in eastern Turkey is the latest of a number of recent large (M~7) earthquakes to cause many deaths and significant damage in a continental setting. This earthquake occurred in a tectonically complex area of convergence and right-lateral shear between Arabia and Eurasia, far from the recognized major plate boundaries, and with the relatively simple strike-slip systems of the North and East Anatolian Faults located well to the west. This session will focus on scientific, technical and social studies of the earthquake's immediate and long-term effects. We welcome contributions from the fields of seismology, geodesy, geology, engineering, and governmental and non-governmental response that provide insights into all aspects of the earthquake cycle in the area, the regional tectonics and structure, and the local impacts of the earthquake and its aftershocks. Studies that highlight comparisons to, or lessons learned from, other similar major earthquakes in the last few years, for example the Haiti and Christchurch earthquakes, and that discuss implications for analogous areas of oblique convergence in California and elsewhere are also encouraged.

    Session Chairs

    Gareth Funning <gareth [at] ucr [dot] edu>
    Mike Floyd <mfloyd [at] mit [dot] edu>
    Semih Ergintav <semih [dot] ergintav [at] mam [dot] gov [dot] tr>
     

  • fielding
    2011.10.23 - M7.2 Eastern Turkey   10 years 46 weeks ago

    I finally obtained the raw data for the COSMO-SkyMed (CSK) data acquired on October 26th and reprocessed the interferogram, which allows imaging of a larger area. It has also been rewrapped to show some more detail. An image and .kmz file are attached here and will also be posted soon on the GEO Geohazards Supersite.

    Caption:

    COSMO-SkyMed (CSK) interferogram (InSAR) rewrapped with 20 cm color contours showing displacements in the radar line-of-sight (28 degrees from vertical and roughly west). Derived from CSK scenes acquired 2011/10/10 and 2011/10/26, processed from the raw data. Processed by Eric Fielding for the JPL-Caltech ARIA project at the NASA Jet Propulsion Laboratory and for the NASA Earth Surface and Interior Focus Area. COSMO-SkyMed original data are copyright 2011 Italian Space Agency (ASI) and were provided under the ASI CSK AO PI project 2271.