Spatial properties of the San Andreas Fault plate boundary surface trace between Desert Hot Springs and the Bombay Beach based on satellite and B4 Imagery.

We present preliminary results of a hyper-accurate (~ few m) inventory of SAF features between Bombay Beach and Desert Hot Springs based on overhead imagery. The ultimate goal is to identify fault features that can be used to determine offset distance and slip rates. Many fault structures have been previously reported and about two dozen new ones have been found in this study (vegetation lineaments, offset channels, soil color changes, scarps, pressure ridges, etc.). Using approximately one hundred fault components we defined a map view piecewise continuous trace of features (and interpolations when no structure could be discerned) that we are calling the provisional plate boundary (PPB). The resulting PPB trace closely matches the faults reported by Clark (1984) and those in the qfaults data base. Using a variety of techniques including radius-of-curvature retrieval and wavelet analysis, we analyzed the PPB and present evidence of spatial structure on scales of a few hundred meters.