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  Clamshell - Sawpit Canyon Fault

TYPE OF FAULT: reverse
LENGTH: 18 km
NEAREST COMMUNITIES: Sierra Madre, Monrovia
MOST RECENT SURFACE RUPTURE: Late Quaternary
OTHER NOTES: This fault dips to the north at about 40 (at the surface) to 50 (at depth) degrees.

The Sierra Madre earthquake of 1991 probably originated on the Clamshell - Sawpit Canyon fault. Though a sizable earthquake, the depth of this quake prevented the rupture from reaching the surface.

REFERENCES


This fault is featured on the following map:

Mojave Fault Map

Southern Fault Map

Los Angeles Fault Map