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Late Quaternary offset of alluvial fan surfaces along the Central Sierra Madre Fault, southern California

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Abstract

The Sierra Madre Fault is a reverse fault system along the southern flank of the San Gabriel Mountains near Los Angeles, California. This study focuses on the Central Sierra Madre Fault (CSMF) in an effort to provide numeric dating on surfaces with ages previously estimated from soil development alone. We have refined previous geomorphic mapping conducted in the western portion of the CSMF near Pasadena, CA, with the aid of new lidar data. This progress report focuses on our geochronology strategy employed in collecting samples and interpreting data to determine a robust suite of terrace surface ages. Sample sites for terrestrial cosmogenic nuclide and luminescence dating techniques were selected to be redundant and to be validated through relative geomorphic relationships between inset terrace levels. Additional sample sites were selected to evaluate the post-abandonment histories of terrace surfaces. We will combine lidar-derived displacement data with surface ages to estimate slip rates for the CSMF.

Additional publication details

Publication type Conference Paper
Publication Subtype Conference Paper
Title Late Quaternary offset of alluvial fan surfaces along the Central Sierra Madre Fault, southern California
Year Published 2016
Language English
Publisher Crestone Science Center
Contributing office(s) Earthquake Science Center
Description 4 p.
Larger Work Type Book
Larger Work Subtype Conference publication
Larger Work Title Proceedings of the 7th PATA Days, 2016
First page 50
Last page 53
Conference Title 7th International INQUA Meeting on Paleoseismology, Active Tectonics and Archeoseismology (PATA)
Conference Location Crestone, CO
Conference Date May 30- June 2, 2016