GPS data collected between July 2, 2019 and July 9, 2019 were analyzed to determine the coseismic offsets for each earthquake.  On the days of the earthquakes, the days were divided into two segments with the first segment ending a minute before the earthquakes and the second segment starting 5 minutes after the event time.  Co-seismic offsets were estimates for sites up to 100 and 250 km from the hypocenters of each earthquake.  The IGS rapid orbits were used as the fixed apriori orbit.  GPS data available through the NSF/GAGE facility at UNAVCO,

Attached files are PDF and GAGE Event file format.
EQ Catalog/ID          : ANSS(ComCat) ci38443183  201907041734 GAGE Event 48
EQ Catalog/ID          : ANSS(ComCat) ci38457511  201907060320 GAGE Event 49

Cell: +1-626-375-2521 

 Fault trace is generalized from combination of satellite imagery and pixel tracking out of JPL (as of about 7/9/19; newer data has become available since then, plase see threads from Eric Fielding, Sang).  Provisional field observations from CGS and USGS on NAWS and off base a combination of many academic contributors and CGS.  Please see legend! Will be updated every couple of days.

The link below is a Keynote animation by Dave Mencin at UNAVCO for 5Hz ground displacements at the 3 closest NOTA stations to the M7.1 event: P595, P594, CCCC.  These use rapid orbits.  The grid spacing is 10cm for each plot.  P595 shows the most coseismic displacement but P594 appears to have the greatest acceleration (a VSat comm site that managed to stay online but with increased latency after the earthquakes). 

https://www.dropbox.com/s/y4kb80pcw50x6q1/Draft_Particle_Motions.key?dl=0

Hi All, 

Attached are kmz of detailed fault trace mapping, mapped frmo the following geodetic data: 

- Sentinel 1 unwrapped phase

- Sentinel 1  correlaiton image

- Planetlabs optical image displacement maps. 

Cheers

Chris 

The attached pdf has a few images of initial representations of the two main ruptures, an Eastern and a Southern Little Lake fault. These representations are based on the hypocentral locations of the USGS/Comcat catalog and the five focal mechanisms for M5 and larger events in the sequence. Following the Riesner et al. (2017) approach of generating reproducable 3d fault geometries I used the SW-NE striking nodal plane of the initial M6.4 event to constrain the Southern Little Lake fault both in terms of location and orientation, and the the four nodal planes aligned with the main trend for the Eastern Little Lake fault for orientation, and main shock hypocenter for location. These constraints have a weight of 1 relative to the weight of 1e-4 of M5 and smaller events, per event. So the resulting planes can be roughly considered averages of the hypocentral locations respecting nodal plane orientations.

The Eastern Little Lake fault is truncated at bounding faults - the Airport Lake fault to the north and the Garlock fault to the South. The termination of the Southern Little Lake fault representation is simply controlled by aftershock density. The base of the faults is controlled by a regional seismogenic thickness surface, and the top by topography.

I plan to use the posted rupture trace maps to add the trace as a heavily weighted control to this workflow asap. Similarly, once event relocations are available it will be possible to rerun the workflow more carefully.

Let me also share a few time lapse animations in map and perspective views of the first four days of the sequence as we have developed a capability to animate object coloring based on stored times in our 3d modeling environment. I used fractional days in July as a time parameter and this is what is shown in the time scale bar. The length of the scale bar corresponds to the number of days each event keeps being shown after it occured. At the end of the time window events fade out.

The animations are on google drive in the animations folder:

https://drive.google.com/drive/folders/1vnB0kLd-FOP9-hD920IjjaaDpfzzqnjD...

7/11: Updated slides

 

I put together the linked presentation for a talk I gave this morning at a seismotectonics workshop. The materials are scavenged from where they were was publicly available (mostly twitter) and with hopefully appropriate attribution. Let me know if something needs to be corrected. Thanks to all for readily sharing results and ideas.

 Thanks for posting the kmz of the interferogram.  I see different secondary ruptures in the two interferograms.  Fascinating.

Susanne

Here are some new InSAR products from the SIO team (Courtesy of Xiaohua Xu and David Sandwell)

- Sentinel-1 track 64 wrapped phase map (kmz attachment) 

- Sentinel-1 track 64 phase gradient map (kmz):  
https://drive.google.com/file/d/16Tu-AACzGDmDwMgynNSp1Gn8PwIhrhba/view

- Sentinel-1 interferogram, comparison with with Hector Mine rupture, and phase gradient image (jpg attachments) 

 Hi,

These InSAR scenes from Xu and Sandwell are supervaluable. 

It is possible to get a kmz version of the interferograms?  I'd like to compare my mapping of the mesh of faults on ARIA with the faults detected by the scene you shared.

Thanks!

KMZ file now includes sites measured by UNR and USGS. No more reports of GPS occupations that I am aware of.

File also contains suggested sites to target both on and off the base. Let me know (gareth@ucr.edu) if you are planning on measuring any of them, so that we can coordinate who goes where, and minimize duplication of effort!