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Southern California Geology


Geologic Setting of the San Gabriel Mountains, Transverse Ranges Province

Geologic Structures

Other Faults in the San Gabriel Mountains

Located north of the Cucamonga Fault zone between Lytle Creek and San Antonio Canyon are three northwest-striking right-lateral faults, the Duncan Canyon, Morse Canyon, and Demens Canyon faults (Morton and Matti, 1987). They appear to be terminated on the south by the Cucamonga Fault zone and on the north by the South Fork Lytle Creek Fault. All three show right-lateral separation, the 1.5-km separation along the Duncan Canyon Fault being the greatest. See a web-site presentation of how these faults might have interacted with the San Jacinto Fault zone in the San Bernardino Basin region.

Secondary faults in the area of the San Gabriel Mountains commonly have reverse slip (Weldon and Matti, 1986) and analysis of current seismicity gives a mix of reverse and strike-slip fault-plane solutions (Jones, 1988).

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This site last updated September 3, 2004 (ps)

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