The other key aspect of deformation along the CSAF that needs to be studied is the temporal variation of surface displacement and, by implication, of creep rate on the fault. Preliminary work has been started using a Persistent Scatterer approach, to construct displacement time series at individual points on the ground. This relatively new technique identifies individual radar scatterers that remain coherent over a long period of time (years to decades). In addition, time series from Plate Boundary Observatory GPS points are being studied to look for variations in creep rate over time, and possible correlations in time between features at different points along the fault. Building a detailed picture of both spatial and temporal variations should help us understand the mechanics, as well as the kinematics, of creeping fault zones.
Berkeley Seismological Laboratory
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