Geophysics Unit of Menlo Park-GUMP

GMEG - Geophysics Unit of Menlo Park, CA- (GUMP)


Geophysics Unit of Menlo Park, CA (GUMP)

U.S. Geological Survey - Western Region - Geology and Geophysics

Imge 2

2. The compressional left step in the Rialto-Colton fault forces the San Jacinto fault to step right and utilize the Duncan Canyon fault (~1.5 km offset) and the western-most branch of the Lytle Creek fault (3.5-4 km offset). Movement on these faults transfers in part to the South Fork Lytle Creek and San Antonio Canyon faults. This adds up to a total of ~4 km displacement on the San Antonio Canyon fault, which is close to Morton and Matti's 3 km based on geologic mapping (Morton,1975, 1976; Morton and Matti, 1987) and regional correlations (Matti and Morton, 1993). The remainder of the displacement is either taken up in thrusting or transferred to the San Andreas fault. The older Rialto-Colton fault is utilized as a normal fault in the start of the extension in the San Bernardino basin.

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  San Bernardino Regional Gravity

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