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  • arrowsmi
    2014.08.24 - M6.0 South Napa Earthquake, California   2 years 30 weeks ago

     added an image of the 2 m dem computed from 2003 lidar from NCALM at OpenTopography. Here is link to kmz: https://drive.google.com/file/d/0B2YW8UjIIMEhTDliMXZjekY3dTA/edit?usp=sharing 

  • oskin
    2014.08.24 - M6.0 South Napa Earthquake, California   2 years 30 weeks ago

     The rupture across highway 121 is to the west, in the carneros hills area. The westing and Hanson report maps lineaments and low amplitude folding in the napa river flood plain. This connects to a prominent scarp at Alston park in the city of napa, Recently Tim Dawson trenched this west napa fault 'scarp' and found no fault! Scarp must be fluvial there. All in all the fault locations in napa valley are not terribly well known, though there is enough evidence to strongly suggest that an active fault runs up the length of the valley on its west side.

    The ca fault activity map does have a carneros fault on it. Perhaps this is the source?

    Coincidentally I have a pending NEHRP proposal to work on the west napa fault fault in Northern napa valley near st Helena and Calistoga. It's well expressed in the LIDAR there. 

  • eqadmin
    2014.08.24 - M6.0 South Napa Earthquake, California   2 years 30 weeks ago

    I think we've sorted out the file access issue too. Thanks!

  • arrowsmi
    2014.08.24 - M6.0 South Napa Earthquake, California   2 years 30 weeks ago

     http://earthquake.usgs.gov/research/external/reports/05HQAG0002.pdf

  • steidl
    2014.08.24 - M6.0 South Napa Earthquake, California   2 years 30 weeks ago

    Yes, it does seem like it. I've not paid attention to this before, but perhaps it's just an artifact of the code, and how long it takes to declare an alert and start drawing the circles. Good question for Richard.

  • beroza
    2014.08.24 - M6.0 South Napa Earthquake, California   2 years 30 weeks ago

    Is the yellow circle the P-wave?  If so, they're alerting about a second before the P-wave emerges at the epicenter...

  • huynht
    2014.08.24 - M6.0 South Napa Earthquake, California   2 years 30 weeks ago

    FYI: http://www.californiaeqclearinghouse.org/m6-0-south-napa-earthquake/

  • beroza
    2014.08.24 - M6.0 South Napa Earthquake, California   2 years 30 weeks ago

    Just talked to Tom Brocher on the phone.  He said:

    (1) 5 geologists, including Ben Brooks and Dave Schwartz, are headed up to look for surface rupture.

    (2) Tom Holzer is headed up to look for ground failure.

    (3) Jess Murray is looking at GPS data and have information on displacements.  Her group will be resurveying campaign-GPS sites within the next day or so.

    (4) Paul Spudich is coordinating seismic response.  Possible targets include the delta, ground-motion effects, and fault-zone imaging.

    (5) He has heard from John Parrish that CGS is sending at least 3 geologists.

    (6) The state is setting up a clearinghouse, and Tom said that the USGS would post information there.  Anne Rosinski is the point of contact for that.

  • steidl
    2014.08.24 - M6.0 South Napa Earthquake, California   2 years 30 weeks ago

    Nice success for Shake Alert with initial magnitude at M5.7. Obviously too close to be of much use in this case, but still a good example of EEW capabilities.

    https://www.youtube.com/watch?v=DwdCJ31LFGI&feature=youtu.be

  • arrowsmi
    2014.08.24 - M6.0 South Napa Earthquake, California   2 years 30 weeks ago

    good morning everyone.

    I posted a few things earlier on my blog: http://activetectonics.blogspot.com/2014/08/24-august-2014-m6-earthquake...

    Nothing that you won't already know but I did make a figure combining the focal mechanism and the active fault traces. I attached the image here. Center of focal mechanism is at epicenter

    I saw a nice map of the event and aftershocks at http://seismo.berkeley.edu/index.html

     

     

  • steidl
    2014.08.24 - M6.0 South Napa Earthquake, California   2 years 30 weeks ago

    I sorted out the threaded settings, and once I saved settings it worked, so I edited my post...

    Still can't get to either of the posted images?

  • fielding
    2014.08.24 - M6.0 South Napa Earthquake, California   2 years 30 weeks ago
    There are pre-quake images of this area acquired by the Italian COSMO-SkyMed satellites. Most recent images were June 19 (ascending track) and July 26 (descending track). We don't know yet when they will acquire the next images on these tracks. ++Eric Fielding JPL-Caltech ARIA project
  • huynht
    2014.08.24 - M6.0 South Napa Earthquake, California   2 years 30 weeks ago

    Jamie - Try again? Fixed the file attachment from Greg and you can change your comment viewing settings at top. --Tran

  • steidl
    2014.08.24 - M6.0 South Napa Earthquake, California   2 years 30 weeks ago

    File from Greg does not seem to be available...

  • oskin
    2014.08.24 - M6.0 South Napa Earthquake, California   2 years 30 weeks ago

     Clear dextral offset of highway marker lines by about 10 cm. A group from uc Davis is heading out to get measurements before repairs obliterate things. I am in Southern California visiting family so I will be coordinating remotely.

  • beroza
    2014.08.24 - M6.0 South Napa Earthquake, California   2 years 30 weeks ago

    I've attached a screen grab of the USGS locations overlain on terrain and street map.

     

     

  • huynht
    2014.08.24 - M6.0 South Napa Earthquake, California   2 years 30 weeks ago

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

  • hstenner
    2013 Golden Guardian Exercise is "on" - please participate!   3 years 44 weeks ago

    Please upload again?

    "Clearinghouse Golden Guardian exercise summary and timeline.pdf" link not working.

  • hudnut
    2013 Golden Guardian Exercise is "on" - please participate!   3 years 45 weeks ago

    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

  • hudnut
    2012.05.30-Golden Guardian Exercise   3 years 45 weeks ago

    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
     

  • Treiman
    2012.08.26 - Swarm near Brawley, California   4 years 26 weeks ago

    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)

  • walls
    2012.08.26 - Swarm near Brawley, California   4 years 28 weeks ago

    Aug. 26th (JD 239) 5Hz data from the following stations: P494, P495, P496, P497, P498, P499, P501, P502, P503, P506, P507, P508, P509, P510, P744 with remote stations P449 and P779
    are available at
    ftp://data-out.unavco.org/pub/highrate/rinex/2012/239/

    Thanks to Yehuda B. for the request.

  • fielding
    2012.08.26 - Swarm near Brawley, California   4 years 29 weeks ago

    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/ 

  • hudnut
    2012.08.26 - Swarm near Brawley, California   4 years 29 weeks ago

    Updated figures that now include updated SCSN seismicity and mapped traces of the Imperial and Brawley faults (from Qfaults), as well as GPS tracks from the field recon.

    Additionally, last night I checked at Salt Creek and today I checked several other locations along the southern San Andreas in the Coachella Valley and did not find any new cracking or any other evidence of triggered creep (Thousand Palms Canyon and near Devers Hill).

  • walls
    2012.08.26 - Swarm near Brawley, California   4 years 29 weeks ago