SCEC Award Number 15148 View PDF
Proposal Category Collaborative Proposal (Special Fault Study Area)
Proposal Title Collaborative Research: Modeling Crustal Deformation in and around San Gorgonio Pass
Investigator(s)
Name Organization
Sally McGill California State University, San Bernardino Richard Bennett University of Arizona Joshua Spinler University of Arizona
Other Participants This proposal includes undergraduate student funding
SCEC Priorities 4a, 1d, 1a SCEC Groups Geodesy, CEO, SoSAFE
Report Due Date 03/15/2016 Date Report Submitted 05/14/2016
Project Abstract
 In 2015 we completed our 3rd year of SCEC-funded GPS observations in San Gorgonio Pass. Starting in summer 2013, we began observations at 23 new sites in San Gorgonio Pass and continued observa- tions at another 11 sites we had previously observed in the pass. We also continued observations at a number of sites in the San Bernardino Mountains and San Bernardino Valley. The average uncertainty in the east and north velocity components for the new sites is now about 4 mm/yr. Over past 3 years, eight SCEC interns have been supported to help with this project. In addition 42 other undergraduate students, 1 master’s student, 25 high school and middle school teachers and 1 museum employee have participated in the project over the past 3 years, supported by grants from the National Science Founda- tion and from NASA. Participants have presented 14 posters at SCEC and have given 3 oral and 5 poster presentations at other professional meetings within the past 3 years.
Intellectual Merit The raw GPS observations and the site velocities computed from this work will be contributed to SCEC’s community geodetic model, which will help to constrain fault slip rates in the San Gorgonio Pass Special Fault Study Area.
Broader Impacts Over past 3 years, eight SCEC interns have been supported to help with this project. In addition 42 other undergraduate students, 1 master’s student, 25 high school and middle school teachers and 1 museum employee have participated in the project over the past 3 years, supported by grants from the National Science Foundation and from NASA. Participants have presented 14 posters at SCEC meetings and have given 3 oral and 5 poster presentations at other professional meetings within the past 3 years.
Exemplary Figure Figure 1: Preliminary velocities including observations up through December 2015, for sites in the Joshua Tree network (blue vectors) and in the San Bernardino Mountains network (red and black vectors). Black vectors show new San Gorgonio Pass sites, with observations beginning in 2013. Anomalous orientations and magnitudes for the black vectors may be the result of processing issue that is being investigated, or may be expressing motion related to post-seismic deformation from the 2010 Hector Mine earthquake. (McGill, Spinler and Bennett)