Detecting transient Deformation using InSAR

Preliminary measurement of near fault motion on the Central San Andreas. Blue dots are InSAR values, green triangles and secular + transient motion from creepmeters, red triangles are secular creep from creepmeters.

Project Summary We use campaign and continuous GPS measurements as well as InSAR to measure the deformation from slow slip events on the San Andreas Fault. A series of slip events have been observed (1992, 1996, 1998) using strain- and creep-meters. Each event has been close to M5; as large as the largest seismic events in these areas. We have made two interferograms spanning the 1998 slow slip event which show significant shallow slip along the central San Andreas. These interferograms allow for the possibility that slip extended further south than inferred from the creep- and strain-meter records. However, the contribution of secular creep to the observed pattern needs to be understood before final conclusions can be drawn.

Tools SAR data from ERS1&2, ROI_PAC processing software and SNAPHU unwrapping algorithm

Geographic Location South of Monterey, CA, north of Parkfield

Group Members Involved Ingrid Johanson <Email> <Personal Web Site>
Roland Bürgmann

Project Duration 2000-present; data from 1994 through present

More Information < 2002 AGU Poster >