HR: 09:30h
AN: G31A-07 INVITED     [Abstracts]
TI: Aseismic events in Southern California: Detection with InSAR
AU: * Lohman, R B
EM: rolohman@gmail.com
AF: Jet Propulsion Laboratory, 1200 Oak Grove Drive, Pasadena, CA 91109, United States
AU: McGuire, J J
EM: jmcguire@whoi.edu
AF: Woods Hole Oceanographic Institution, 360 Woods Hole Road, Woods Hole, MA 02543, United States
AU: Lundgren, P
EM: Paul.Lundgren@jpl.nasa.gov
AF: Jet Propulsion Laboratory, 1200 Oak Grove Drive, Pasadena, CA 91109, United States
AB: Aseismic slow slip events are usually studied using data types that have a dense temporal sampling rate, such as continuous GPS or tremor analysis using seismic data. However, even the sparser temporal coverage of InSAR data can further our understanding of these events in three significant ways - First, in areas where aseismic transients have been detected on geodetic arrays, InSAR may be able to provide a spatially denser image of the extent and magnitude of deformation. Second, InSAR observations are complementary to GPS because of the differing sensitivities to horizontal and vertical motions. Thirdly, in areas with no ground-based geodetic instrumentation, InSAR can be used in survey mode to detect deformation signals that are not associated with any observed seismicity. The temporal constraints on such signals may not be tight enough to allow for dynamics models of how aseismic transients occur, but InSAR-only detections can improve our understanding of the spatial extent of these types of events and can also identify key areas for future instrumentation and observation. Here, I summarize some of the contributions of InSAR observations of slow slip events, including data spanning the 2005 Obsidian Buttes swam in the Salton Trough, CA, and InSAR time-series results for the Salton Trough using both traditional interferometry and the persistent scatterer method.
DE: 1207 Transient deformation (6924, 7230, 7240)
DE: 1211 Non-tectonic deformation
DE: 1243 Space geodetic surveys
DE: 7250 Transform faults
SC: Geodesy [G]
MN: 2007 Joint Assembly