Using GeoGateway Line-of-Sight (LOS) Tool to Explore Deformation along the San Andreas Fault in the Carrizo Plain, CA

Lisa Grant Ludwig, Andrea Donnellan, & Jay W. Parker

Published August 15, 2017, SCEC Contribution #7748, 2017 SCEC Annual Meeting Poster #152 (PDF)

Crustal deformation is spatially and temporally non-uniform as strain accumulates over long time scales, is rapidly released in earthquakes, and readjusts post-seismically. Because earthquake processes occur over widely varying temporal and spatial scales, multiple types of data from different parts of the earthquake cycle are required for analysis. We use NASA’s GeoGateway tool to access, analyze and model GPS and UAVSAR data along the San Andreas fault in the Carrizo Plain, and incorporate optical imagery, fault models, and paleoseismic data from geologic studies. GeoGateway is a convenient and powerful tool for analyzing these heterogeneous data sets for enhanced understanding of the earthquake cycle. GeoGateway’s Line-of-Sight (LOS) tool allows us to easily select and plot interferograms from pairs of UAVSAR flights. The interferogram images allow change detection for recognition of tectonic deformation, and measurement of surface elevation changes during the time period between flights. This is helpful for interpreting results of paleoseismic studies, and recognizing interseismic deformation. UAVSAR interferograms and LOS Tool allow us to look for creep. On the creeping section of the San Andreas fault, creep is easily recognized. For comparison, with the same scale, we see no discernible creep or anomalous off-fault deformation along the San Andreas in the Carrizo Plain.

Key Words
San Andreas fault, Carrizo, creep, deformation, UAVSAR

Citation
Grant Ludwig, L., Donnellan, A., & Parker, J. W. (2017, 08). Using GeoGateway Line-of-Sight (LOS) Tool to Explore Deformation along the San Andreas Fault in the Carrizo Plain, CA. Poster Presentation at 2017 SCEC Annual Meeting.

Related Projects & Working Groups
Earthquake Geology