Science Service System

Summary of Proposal GEO1609

TitleInvestigate earthquake faulting process and crustal dynamics in southern California using high-resolution TerraSAR-X data
Investigator Liu, Zhen - Jet Propulsion Laboratory, California Institute of Technology, Solid Earth Group
Team Member
Research Scientist Lundgren, Paul - Jet Propulsion Laboratory, Solid Earth
Research Scientist Fielding, Eric - Jet Propulsion Laboratory, Solid Earth
Assistant Professor Lohman, Rowena - Cornell University, Earth and Atmospheric Sciences
Hydrologist Sneed, Michele - United States Geological Survey, California Water Science Center
Remote Sensing Scien Aly, Mohamed - Idaho State University, Department of Geosciences
Lindsey, Eric - University of California San Diego, Scripps Institution of Oceanography
SummaryEarthquake hazard has been a significant risk faced by the metropolitan Los Angeles and surrounding southern California due to major active faults in the region including San Andreas fault (SAF) system. Surface deformation imaged by space-borne satellite data, in addition to extensive in-situ networks of seismometers and GPS instruments in the region, provides the key observations to constrain faulting processes and plate boundary dynamics. The primary objectives of this proposal are to 1) determine space-time variability of fault slip/locking and 2) understand mechanical responses of the lithosphere and faults following the 2010 El Mayor-Cucapah (Baja) earthquakes. Improved models for fault slip and transient strain in the crust/upper mantle are important for understanding both the spatial variations in fault mechanical properties and their correspondence with seismicity and large earthquakes, and for understanding the rheological response of the lithosphere and the dynamics of stress transfer and earthquake hazard. To achieve those objectives we propose to use archived TerraSAR-X data to develop high-resolution InSAR deformation map and time series. We will use the extended version of JPL-Caltech ROI-PAC software for SAR interferometry analysis and an in-house variant of the SBAS approach (along with recent wavelet-based algorithm MInTS by Hetland et al. at Caltech) to generate InSAR time series. These TSX deformation data products will be combined with in-situ GPS time series and incorporated into geophysical modeling to quantify fault slip rate/locking, time-varying transient slip, and modeling of postseismic deformation processes following 2010 El Mayor-Cucapah earthquake. We will investigate lithospheric response and rheological control on surface deformation processes as well as whether the large and evolving stress change resulting from this earthquake has induced any possible fault slip variation across the southern San Andreas Fault (SSAF) San Jacinto Fault (SJF) system, both in terms of creep events and changes in deformation profiles. We will use both time-independent and time-dependent fault slip inversion techniques to resolve space-time fault slip variability, and numerical modeling that account for non-linear rheology and rate-strengthening friction to model postseismic deformation processes. We are also interested in comparing TSX data products with those from the NASA UAVSAR airborne repeat pass interferometry data, an L-band system that has been observing over SAF region since February 2009. We expect scientific output and knowledge advance from this project will improve our capability to quantify and assess earthquake hazard of southern California fault system. All scientific results will be reported in peer- reviewed journals. Data requirements: TSX data in Stripmap mode, single polarization (HH) that covers Los Angeles and southern California. Funding: The PI have a jointly funded NASA grant that covers InSAR data processing and analysis and integration of InSAR and GPS for California transient fault and mechanical processes, and a separate NASA grant for application of NASA UAVSAR to central San Andreas fault.

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