Skip to main content
eScholarship
Open Access Publications from the University of California

UC Riverside

UC Riverside Electronic Theses and Dissertations bannerUC Riverside

A Study of Rock Avalanche Deposits in San Antonio Canyon, San Gabriel Mountains, California

Abstract

The San Antonio Canyon is within the eastern San Gabriel Mountains, southern California. The steep slopes of the canyon contain mostly fractured Mesozoic plutonic and Paleozoic and Precambrian metamorphic rocks. The San Andreas fault, San Jacinto fault, and the Sierra Madre-Cucamonga fault are all capable of producing large earthquakes with strong ground shaking and all bound the eastern San Gabriel Mountains near the San Antonio Canyon. There are five main rock avalanche deposits within the canyon which have been interpreted previously to be between 100 ka and 2.6 Ma. Preliminary dates suggest these rock avalanche deposits are several magnitudes younger than previously thought. This makes the canyon a very active and dynamic landscape with large landslide and earthquakes hazards more prevalent than previously expected.

Main Content
For improved accessibility of PDF content, download the file to your device.
Current View