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I do not plan on going to the field for this event. I will be surprised if it produced any ground rupture. It will be interesting to see what the UAVSAR picks up though.
-Mike
I get a "page not found".
Does anyone have any field response plans yet?
It is fortuitous that UAVSAR just flew this area.
Coordination plans for Modeling and Simulation Group can be found at: http://response.scec.org/coordination_simulations
Attached is a SCEC-VDO Image of Coyote Creek Event by Sandarsh Kumar.
Over the course of four days last week, Michal Rymer and I (with the assistance of Martin Siem) identified widespread fault rupture throughout the Yuha Desert area. Perhaps most significant was approximately 1 km of rupture (right-normal) along a pre-existing scarp just east of Ocotillo. Freshness of features and displacement of tire tracks suggest that most, if not all, of this rupture occurred within the previous few days and probably in response to the M5.7 aftershock of last Monday night.
Location of additional fault rupture was greatly simplified by targeting the linear anomalies from the interferograms produced by Eric Fielding and his group at JPL. Nearly every sharp lineament, and many more-diffuse lineaments, were marked by ground rupture. These interferograms allowed us to map more than a dozen additional faults. The widespread faulting, much of it trending southward across the border, lends importance to mapping the area in Mexico between the border and Highway 2. Unfortunately this work is not currently planned by the California or U.S. Geological Surveys.-- Jerry Treiman, California Geological Survey
Hi, it seems that the problem with viewing the images in the comment pages is that the thumbnail images are missing. For example, in my comment with the attached UAVSAR image, the embedded image thumbnail is supposed to be at "http://response.scec.org/sites/default/files/imagecache/AttachmentThumbnail/unw-Ml5.9_quake_aftershocks.jpg" but that is missing.
You should be able to view/download jpg now.
Hi Heidi,
Yes, it seems that the JPEG images are not appearing on the comment pages correctly. I was able to view it when I clicked on the placeholder, which took me to this URL:
http://response.scec.org/sites/default/files/unw-Ml5.9_quake_aftershocks...
Same thing happened to Yuri's stress change image.
Can't see your jpeg, Eric, it says "page not found."
Thanks
Next ALOS track is also planned for acquisition - I think it will be on June 19th. The previous overpass was acquired.
The next pass of Envisat over the area of the Yuha quake is June 22 on ascending track 306 and it is planned for acquisition.
The M5.7 aftershock appears to be in the area where shear stress was increased by the April 4 event. Stress changes were computed by Sylvain Barbot using our preliminary slip model ( http://igpp.ucsd.edu/~fialko/baja.html ).
Attached is quick view of the UAVSAR interferogram from flights in October 2009 and April 13, 2010, with the recent aftershocks plotted from standard USGS real-time earthquakes. Overlay lines are from USGS Qfaults database. Fringes in UAVSAR interferogram (color contours) are 11.9 cm each cycle.
I hope we can refly this line sometime soon.
Unfortunately, the 5 UCR/SCEC seismic stations near Calexico and Ocotillo were removed yesterday afternoon - poor timing! And, the 3 UCSB/SCEC stations were removed approximately one month ago.
Statement by the California Earthquake Prediction Evaluation Council sent to the California Emergency Management Agency at 12:04 am, June 15, 2010.
Teleconference call, June 14, 2010
Following the M5.7 Aftershock of the El Mayor-Cucapah Earthquake
At 21:26 hrs PDT this evening, June 14, 2010, a Mw 5.7 earthquake occurred 5 miles southeast of the Imperial County community of Ocotillo. The earthquake was the largest aftershock so far of the Mw 7.2 El Mayor-Cucapah earthquake that occurred on Easter Sunday. This earthquake occurred at the northern end of the aftershock zone in an area where there has been considerable activity during the past 10 weeks. The Mw 5.7 earthquake rapidly was followed by a tight cluster of over 30 smaller earthquakes, about 20 of which were in the range of Mw 3.0 to 4.5.
CEPEC convened a teleconference call at 22:30 hrs PDT to discuss the implications of the aftershock. It occurred along the southernmost portion of the Elsinore Fault Zone, which has not had a major earthquake in the past 100 years or so. Because of the location of the Mw 5.7 aftershock , CEPEC believes that the probability of a larger event on the Elsinore Fault or the San Jacinto Fault has increased considerably, and will remain so for several days, although the absolute probability remains low, on the order of one percent. CEPEC will continue to monitor the situation.
Unfortunately, it looks like UAVSAR is in Canada right now - will check on whether the various SAR platforms are planning to acquire their next passes.
As of this evening I am making tentative plans to explore the Yuha Wells Fault and vicinity for new/renewed rupture. I will be in my office (213-239-0889) Tuesday morning, gathering maps/photos/material and plan to drive down from L.A. Tuesday noon. On the road and in the field I can be reached at 213-507-1080. Is anyone else planning any response?
-- Jerry Treiman, California Geological Survey
For those who missed the exciting GSA Cordilleran Section special session (Sat., 29 May) on the El Mayor - Cucapah earthquake I'd like to mention two presentations that were very relevant to tonight's aftershock activity. Treiman et al. (2010) have mapped extensive surface faulting on faults in this area, and the UAVSAR interferogram presented by Fielding et al. (2010) shows motion on many faults in the area as well. Together, these observations make for an impressive display of the complexity of fault motions near the NW end of the El Mayor - Cucapah aftershock zone.
1) Treiman, J.A., Rymer, M.J., Kendrick, K.J., Lienkaemper, J.J., Weldon, R.J. II, Hernandez, J.L., Irvine, P.J.,
Knepprath, N., Olson, B.P.E., and Sickler, R.R., "Triggered Slip in Southern California as a Result of the April 5, 2010 El Mayor-Cucapah Earthquake", http://gsa.confex.com/gsa/2010CD/finalprogram/abstract_174668.htm
2) Fielding, Eric J., Leprince, Sebastien, Wei, Shengji, Sladen, Anthony, Simons, Mark, Avouac, Jean-Philippe,
Lohman, Rowena, Briggs, Rich, Hudnut, Ken, and Helmberger, Don, "InSAR and Subpixel-Correlation Pixel- Tracking Measurement of the 2010 El Mayor-Cucapah Earthquake" http://gsa.confex.com/gsa/2010CD /finalprogram/abstract_174646.htm
The 9:26 pm M5.7 earthquake has a rich aftershock sequence at the northwestern end of the El Mayor-Cucapah aftershock zone. CEPEC convened by telecon at 10:30 pm, June 14, to discuss the event and will shortly issue a statement to CALEMA regarding the increased (though still low) probability of a large earthquake on the Elsinor fault
Links to the relevant pages for tonight's M 5.7 aftershock near Ocotillo (felt here in La Crescenta) have been added to the SCEC home page.
http://www.data.scec.org/recenteqs/Quakes/ci14745580.html
-John Marquis
Let's bring up a separate response page for the 5.7 eveent at 9:26 pm June 14.
Links to the relevant pages for tonight's M 5.7 aftershock near Ocotillo (felt here in La Crescenta) have been added to the SCEC home page.
http://www.data.scec.org/recenteqs/Quakes/ci14745580.html
The attached PDF file from Nancy King summarizes the USGS activities for the El Mayor Cucapah earthquakes in May.
Brad
OpenTopography has been working with Alejandro Hinojosa at CICESE to obtain access to 5 meter resolution LiDAR topography data for the epicentral region of the El Mayor - Cucapah event. These data cover an area of over 2,000 square kilometers southwest of Mexicali (including the Sierra Cupapa - Sierra El Mayor ranges and the border region near the Yuha Desert) and were acquired in 2006 by the Instituto Nacional de Estadística y Geografía (INEGI).
I've taken the DEM data and generated hillshade imagery that can be viewed in Google Earth (similar to what I've done for the EarthScope LiDAR data). The Google Earth KMZ file, as well as more information about the data can be found here:
http://www.opentopography.org/index.php/blog/detail/lidar_data_for_n_baj...
We have not yet gotten permission from INEGI to distribute the DEM data, but Alejandro is working on obtaining acess to the original LiDAR point cloud as well as permission to distribute the data. Obviously the pre-EQ data are of interest for comparison with the data that will be collected in the next few weeks by NCALM.
Let me know if you have questions or encounter problems with the KMZ file.
-Chris Crosby
http://www.opentopography.org