SCEC Award Number 18134 View PDF
Proposal Category Individual Proposal (Data Gathering and Products)
Proposal Title Continuation Proposal: Assembly of the Community Geodetic Model and GPS Survey of the Imperial and Cerro Prieto Faults
Investigator(s)
Name Organization
David Sandwell University of California, San Diego Alejandro Gonzalez-Ortega Centro de Investigacion Cientifica y de Educacion Superior de Ensenada (Mexico) Jose Javier Gonzàlez-Garcìa Centro de Investigacion Cientifica y de Educacion Superior de Ensenada (Mexico)
Other Participants Xiaohua Xu,
Hiroka Arai
SCEC Priorities 1a, 1b, 2a SCEC Groups Geodesy, CXM, SAFS
Report Due Date 03/15/2019 Date Report Submitted 03/20/2019
Project Abstract
 This is a continuation of our 2017 investigation with three main activities. First, during this period, the SCEC Community Geodetic Model and web site transitioned from UCSD to USC so we spent less time on the CGM web site activity. Nevertheless, we hosted a CGM workshop at SIO during March 12 and 13 of 2018 to update and refine the CGM. Second, we completed a California-wide InSAR time series using the first three years of Sentinel-1 data and believe this new data set, in combination with GPS time series, can provide a full high resolution, time-dependent deformation map with seasonal temporal resolution. Third we continued our SIO/CICESE collaborative GPS analysis and performed 4th survey across the Cerro Prieto fault. All of these activities are providing a better estimate of the seismic moment accumulation rate on the fault systems of Southern California and Northern Baja, MX.
Intellectual Merit The focus of this research is to improve the estimates of seismic moment accumulation rate on the fault systems of Southern California and Northern Baja, MX. This is accomplished using crustal deformation measurements from GPS and radar interferometry. During this period we developed new GPS/InSAR integration methods using the new InSAR data being provided by the Sentinel-1A and B spacecrafts.
Broader Impacts Funding for this research supported part of the PhD research of graduate student Xiaohua Xu. He received his PhD in November of 2017 and continued this research as a postdoc at SIO. In addition, collaborative field work with scientists and students at CICESE, Ensenada MX, has enhanced US Mexican relations at both programatic and personal scientific levels.
Exemplary Figure Figure 5: Preliminary GPS velocity in northern Baja California in ITRF2008. Black arrows are continuous GPS data. Blue arrows are GPS survey mode data, and green dots represents recently survey sites during this time project.