Fault segmentation and properties modeled from paleoseismic data


Geomorphic offsets from the 1857 earthquake along the Cholame and Carrizo segments of the San Andreas Fault have been shown to increase by several meters in the Carrizo segment. Modeling of the fault surface can begin to unravel the effects of fault depth, fault strength and prior loading on the surface displacements. The increased fault depth of the Carrizo segment is well-documented. Although the loading history is not well known, boundaries can be placed in order to infer relative fault strength of the Cholame to the Carrizo. Preliminary modeling suggests that the strength ratio of the Cholame segment to the Carrizo is between 2/3 and 1/3. This fault property is an important predictor for earthquake recurrence and hazard.

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Links for a quick look through the figures...

Figure 1

Figure 2 & 3

Figure 4