SCEC Award Number 15059 View PDF
Proposal Category Individual Proposal (Integration and Theory)
Proposal Title Multi-scale stress and strain-rate model analysis for southern California
Name Organization
Thorsten Becker University of Southern California
Other Participants Carl Tape, University of Alaska
SCEC Priorities 2d, 1d SCEC Groups SDOT, Seismology
Report Due Date 03/15/2016 Date Report Submitted 10/21/2016
Project Abstract
For this particular, SCEC CSM related project, we proposed to use and expand the waveletbased
analysis of Tape et al. (2009) to understand the degree of agreement between different representations
of stress and stressing-rate in southern California. As a baseline, we also suggested the
development of a Kostrov (1974) summation of the Yang et al. (2012) focal mechanism catalog.
No such model of strain-rate (or stress, if interpreted such in the case of normalized summations)
had been submitted to the SCEC CSM previously. Such a model would also be useful to compare
results with Michael (1984) type stress inversions (cf. McKenzie, 1969; Becker et al., 2005).
We made good progress on the latter model building, performed some initial, wavelengthdependent
analysis based on Fourier filtering, but still have to complete the wavelet based analysis.
We report on project-related efforts below.
Intellectual Merit SCEC IV was committed to the development of a Community Stress Model (CSM), and such an
effort speaks to core problems of earthquake mechanics; how faults are loaded, and how the stress
changes due to individual ruptures affect the overall stress state of the system.
Broader Impacts Research was discussed at the SCEC meeting. Regrettably, no student to work on the project could be found.
Exemplary Figure Figure 4