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M6.9
since the usgs crashed, here are quick screen shots I was able to grab. I know all are wanting this!
Some preliminary reports from field teams on the effects of the 6.9 event at 8:19pm July 5. Ken Hudnut reports that he and those with him in ridgecrest are OK. Ian Pierce reports rupture across Highway 178 at a location 1 mile east of that which occurred on July 4.
From Maggie Ortiz-Millan, Program Manager:
Earthquake Engineering Research Institute EERI, as part of the California Earthquake Clearinghouse, will begin hosting nightly Clearinghouse Briefings for the M6.4 Searles Valley earthquake today, July 5, 2019.
Today's briefing will take place at 8 pm Pacific time. The briefing will take place in-person and via GoToMeeting.
In-person Location:
For those in the field now, you are encouraged to attend the briefing in person. The physical clearinghouse location will be in Ridgcrest, CA:
100 W California Avenue
Ridgecrest, CA
Suite number tbd
Virtual GoToMeeting connection information:
Web Link: https://global.gotomeeting.com/join/476130437
Call-in Phone number: +1 (224) 501-3412
Access Code: 476-130-437
Please feel free to forward this information to other colleagues who are or may be planning to conduct reconnaissance.
A virtual clearinghouse website for the earthquake will be set up soon.
Teams are still in the field. The USGS-CGS team was able to trace out about 7.5 km of surface rupture extending southwest from Highway 178. One team was able to access the Navy base and we are still waiting for more details regarding how far the rupture extends to the northwest. Ken Hudnut and Janis Hernandez were also able to complete a helicopter based survey of the area.
I'm hoping to get some of the waypoints compiled and a preliminary map distributed by tomorrow.
Also, the CA Earthquake Clearinghouse will be convening at Ridgcrest City Hall
100 W California Avenue
Ridgecrest, CA
Suite number tbd
Virtual GoToMeeting connection information:
Web Link: https://global.gotomeeting.com/join/476130437
Call-in Phone number: +1 (224) 501-3412
Access Code: 476-130-437
The ARIA data system has automatically processed the data from the Copernicus Sentinel-1 data acquired earlier today (UTC; last night California time) 2019-07-05T01:41 Z and 2019-06-23T01:41 Z. As I mentioned earlier, this track 166 covers only areas well to the east of the earthquake epicenter. Since aftershocks and field observations show the rupture extends only southwest (and maybe northwest) of the epicenter, it is not surprising that there is little or no deformation on this interferogram. I provide a quick Google Earth map of the wrapped interferogram (original 2.8 cm color wrap) for the two frames that were processed separately. There might be a few centimeters of broad deformation related to the earthquake, but it is largely hidden by the atmospheric variations.
I will post the KMZ file and the other data products on the aria-share.jpl.nasa.gov website later today.
As of 1 pm today (July 5th) the UCR team of me (Gareth Funning), Christos Kyriakopoulos and Baoning Wu have deployed GPS receivers at sites F48, J701, H701, PNCL and ATOL. We will service, and maybe redeploy some of these receivers on Monday.
A team from the USGS including Ben Brooks and Jerry Svarc are also in the area, and are currently trying to capture with GPS any ongoing motion of the fault zone at and south of Hwy 178.
UNAVCO Data Response highlight: https://www.unavco.org/highlights/2019/ridgecrest.html
From Kathleen Hodgkinson for Borehole Strainmeter data:
Recording of shear strains by NOTA borehole tensor strainmeters from the Mojave, Parkfield and Anza strainmeter networks. The dashed vertical red line indicates the event origin time. The B921 and B916 traces are shown in blue to distinguish them. Green dots on map show the strainmeter locations, labelled dots refer to the strain traces plotted. The star denotes the earthquake epicenter. Strain data for this event are available from https://www.unavco.org/projects/project-support/geophysical-event-response/geophysical-event-data/geophysical-event-data.html
Thanks Gareth!
5Hz downloads have started for the 225 online NOTA stations within the 255km radius of the epicenter (see attached map of sites by Christine Puskas). Red dots = sites to be downloaded, White dots = either out of radius or offline (data comm issue).
UNAVCO's Twitter feed: https://twitter.com/UNAVCO
I've posted these to a Dropbox link here:
https://www.dropbox.com/sh/1ni09wu71eznapg/AAAWF4FA_WlF_p2e41wntf5Ka?dl=0
Below is a link to a link of SCEC community members on Twitter curated by the Jason Ballmann (ballmann@usc.edu) and the CEO team.
https://twitter.com/SCEC/lists/scec-community?lang=en
A Twitter List by SCEC
PS. Sorry. Technical difficulties.
Until mid-day tomorrow I am the lead USGS response coordinator; from tomorrow through next Tuesday Rob Graves will likely cover for me, or Elizabeth Cochran. The USGS response team includes Ken Hudnut, Todd Erickson, Jerry Svarc, Eleyne Phillips, Josie Nevitt, working with Janis Hernandez (CGS). Overflight (Ken and Janis) is being arranged. No plans to deploy portables; no sense of strong scientific rationale. If anyone is inclined to head out, please let me know.
Sue (626-297-4114; se.hough@gmail.com; hough@usgs.gov)
Here are some slides I presented a while ago. Hope they will be useful for understanding the recent conjugate earthquakes in Southern California. https://twitter.com/XRupture/status/1147125079068696576/photo/1
https://www.scec.org/user/shiqingx
More from Zach Ross
https://twitter.com/zross_/status/1146984322865328128?s=20
https://twitter.com/zross_/status/1147035523216629760?s=20
Tweet from Zach Ross (https://www.scec.org/user/zross)
https://twitter.com/zross_/status/1147001652596989952?s=21
Past seismicity in the area over the last 40 years (black dots) vs Searles Valley sequence (red dots). Relatively little previous activity within (estimated) rupture zone.
I'm uploading some photos from a series of fractures found together with Garteh Funning and Baoning Wu near the route 178.
https://drive.google.com/drive/folders/1-7bii4JMUrj_lKlmw9JDzMTJZva7gQp5
Im having troubles with the Uploading the pictures in this website
and to set automatic permissions from my iPad. I'll give permissions to everyone when I receive email request from google.
I hope to fix the issue tomorrow with my laptop after I'm back to Riverside.
sorry.
A CGS team will be working tomorrow south of Highway 178 to nail down the westward extent of the rupture. If there are other teams in the area, please keep us posted of your observations on the response.scec.org site or feel free to contact me at: timothy.dawson@conservation.ca.gov Lat-lon coordinates or google earth pins of observations very much appreciated!
Other parts of the rupture are likely on the military base. USGS and CGS geologists are meeting with the base represantives tomorrow and will hopefully be able to do some recon. I will try and provide an update if they find anything.
It turns out that the Copernicus Sentinel-1 satellites made two passes over the epicentral area on July 4 (UTC), but they were both before the earthquake by 3 hours and 15 hours. This means we have to wait until July 10 (UTC) for the next passes on those two tracks (ascending track 64 and descending track 71. Bad luck with the timing.
There is a Sentinel-1B pass over the area to the east of the epicenter that should have been acquired at 2019-07-05T01:41:27.812Z, but I measure the closest approach as being 30 km away, so this probably won't image surface ruptures unless the ruptures went far to the east.
The NASA Caltech-JPL ARIA data system has been activated and will automatically process the data when it is available.
I have been in contact with Ben Brooks and Ken Hudnut, who have converged on Ridgecrest and will be talking to the China Lake Naval Weapons Center base commander momentarily. They will be discussing access to the base for rupture mapping. By this time they, Ken and Janis Hernandez should have had a chance to visit the rupture on 178 (awaiting report). I have an urgent for message for anyone else heading to the rupture site: PLEASE DO NOT TRESPASS ON THE BASE. THIS INCLUDES DRONE OVERFLIGHTS. Trespass violations could shut down access for everyone, so just don't do it. The area north of highway 178, which includes the epicenter and probably most of the rupture zone, lies on the military base. There is a clear fence defining this boundary. The area south of 178 is BLM and part of an extensive OHV area. This is the only part of the rupture open for investigation at this time.
Janis Hernandez (CGS) is joining Ken Hudnut (USGS) and headed out there this afternoon. Ben Brooks (USGS) is also on the way with his mobile T-Lidar unit.
CGS will be sending out additional people as needed.
Tim Dawson
RT-GPS Map with links to timeseries, completeness, latency and others: http://gaia.unavco.org/streamStatus/RT-GPS/mapsEquipment.html
The 1Hz caster port for positions is rtgpsout.unavco.org 2110
In San Clemente we have materials, tooling and electronics to build 5+ SDBM stations if there is a community need.
The attachment shows horizontal displacements and predicted magnitude derived from 1Hz data from stations closest to the epicenter. Station P595 had about 113mm PGD (credit Kathleen Hodgkinson).
Left-lateral offset of road striping is consistent with NE-trend of aftershock zone that crosses highway in the vicinity of these photos. Also see these of road damage posted on Twitter that appears to be in about the same location: https://twitter.com/Emily31377/status/1146866135649808384
remaining photos are on twitter: https://twitter.com/neotectonic/status/1146879972625117184
Here are some photos taken by a friend along CA 178 E approximately here:
35.644167, -117.535833