Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 44, Issue 3, Pages 1311-1319Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016GL072289
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Funding
- Southern California Earthquake Center
- NSF [EAR-1033462]
- USGS [G12AC20038]
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Recent investigations have provided new and significantly revised constraints on the subsurface structure of the Ventura-Pitas Point fault system in southern California; however, few data directly constrain fault surfaces below similar to 6 km depth. Here, we use geometrically complex three-dimensional mechanical models driven by current geodetic strain rates to test two proposed subsurface models of the fault system. We find that the model that incorporates a ramp geometry for the Ventura-Pitas Point fault better reproduces both the regional long term geologic slip rate data and interseismic GPS observations of uplift in the Santa Ynez Mountains. The model-calculated average reverse slip rate for the Ventura-Pitas Point fault is 3.5 +/- 0.3 mm/yr, although slip rates are spatially variable on the fault surface with > 8 mm/yr predicted on portions of the lower ramp section at depth.
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