SCEC Award Number 12209 View PDF
Proposal Category Individual Proposal (Special Fault Study Area)
Proposal Title Mid-Late Pleistocene Slip rate through the San Gorgonio Pass from Cosmogenic Dating of the Heights Fanglomerate
Investigator(s)
Name Organization
Richard Heermance California State University, Northridge
Other Participants 1 M.S. graduate and 1 undergraduate. Names not yet known.
SCEC Priorities 4a, 4c, 4d SCEC Groups SoSAFE, Geology, WGCEP
Report Due Date 03/15/2013 Date Report Submitted N/A
Project Abstract
 The goal of this project is to provide new surface-exposure and burial ages from uplifted fan and terrace surfaces within the San Gorgonio Pass, and calculate new uplift rates across the fault segments.
Unfortunately, data collection was delayed until this spring (2013) because we did not have permission to access the study area on the Morongo Indian reservation during 2012. Some of the SCEC funds were used in fall, 2012, to help support CSUN graduate student Josh Graham (tuition) during the 2012-2013 school year. Josh will collect and process samples for this project in the spring, 2013. Additional funds will be utilized in 2013 for sample processing and student stipend expenses.
Permission was received to access the Morongo tribal lands on March 26, 2013. Samples will be collected on April 11-12, 2013 with undergraduate and graduate students from CSUN. Samples will be processed from April-August, 2013 at CSUN, and results presented at the annual SCEC meeting in September in Palm Springs.
Intellectual Merit This project utilizes new and evolving methods of cosmogenic nuclide geochronology and applies these techniques to acquire essential data for modeling earthquake slip across the San Gorgonio Pass.
Broader Impacts This project has allowed me to demonstrate cosmogenic nuclide dating to graduate and undergraduate students at CSUN, many of whom come from underrepresented groups. This local field area has provided a field laboratory to introduce my students to the fundamentals of tectonic geomorphology. Furthermore, this project has combined USGS research from John Matti and colleagues, geophysical models from Michelle Cooke and her research team, and paleoseismology from Doug Yule and his students, to develop an regional understanding of the geology through the San Gorgonio Pass.
Exemplary Figure Figure 1. Sample site locations on the Morongo Indian Reservation. Samples will be collected on April 11-12, 2013. Geologic map after Yule and Sieh, 2003.
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