SCEC Award Number 18125 View PDF
Proposal Category Collaborative Proposal (Data Gathering and Products)
Proposal Title Data Collection for Virtual Earthquakes on Cajon Pass
Investigator(s)
Name Organization
Marine Denolle Harvard University Jascha Polet California State Polytechnic University, Pomona
Other Participants One graduate student and two undergraduate students from CPP, one graduate or one undergraduate student from Harvard, and one graduate student and Professor Kim Bak Olsen from San Diego State University.
SCEC Priorities 4c, 4b SCEC Groups SAFS, Seismology, GM
Report Due Date 03/15/2019 Date Report Submitted 03/12/2019
Project Abstract
 This proposal funded the deployment of broadband seismometers on the San Bernardino Basin edge, the segment of the San Andreas Fault between the San Gorgonio Pass and the Cajon Pass, where Day et al. (2012) suggested that the strongest coupling between source and seismic waveguide occurred. The stations are spaced every ~ 5 km and located in strategic locations for the expected waveguide (farms, schools, private residences). A proposal is submitted (PI: Clayton) in the same program funded the deployment of node seismometers to complete the survey. In this proposal, we deployed 6 CMG-6TD Guralp (Cal Poly Pomona, CPP) in the basin, 10 posthole meridian instruments and 5 Caltech broadbands (Harvard team and San Diego State team) on the segment of the SAF between San Gorgonio and Cajon passes (Fig. 4). We recovered data sampled at 100 Hz. The deployment started in June 2018 and ended right before SCEC 2018 in mid September.
Intellectual Merit The locations of the instruments are strategic to record wave propagation that capture paths through the sedimentary basins and at their edges. The stations also capture paths from the San Andreas Fault at the eastern edge of the San Bernardino Basin, which was poorly sampled before our deployment. Thus, the data will benefit the community in that it will provide unprecedented data coverage for understanding fault zone and basin structure.
Broader Impacts As a whole, PI Denolle has reached out to stakeholders (residents, schools, farms) about the seismic hazard of their area. PI Denolle has dedicated a day of outreach to them with a presentation explaining the scientific outstanding question about their area. PI Polet has involved multiple undergraduate and graduate students in the field work and in the analysis. PI Denolle is training a new female graduate student in seismology, who will dedicate part of her research to basin edge effect and who is now funded by NSF for the follow up analysis. Overall the project is involving 5 institutions (Harvard University, Caltech, CalPolyPomona, San Diego State University, Louisiana State University) with multiple ranks in PI seniority, graduate students, and undergraduate students.
Exemplary Figure Figure 3 shows the HV ratios obtained from broadbands and from nodes.