SCEC Award Number 16063 View PDF
Proposal Category Collaborative Proposal (Integration and Theory)
Proposal Title Simulation of Kinematic Rupture for Multi-Segment Faults Based on Dynamic Rupture Simulations
Investigator(s)
Name Organization
Jorge Crempien University of California, Santa Barbara Ralph Archuleta University of California, Santa Barbara
Other Participants
SCEC Priorities 6e, 6d, 6c SCEC Groups GMSV, EEII, GMP
Report Due Date 03/15/2017 Date Report Submitted 06/21/2017
Project Abstract
 We have modified the UCSB BBP method to account for kinematic ruptures on multiple faults. The modifications are based on dynamic rupture simulations. With the modified method, we have simulated the 1992 Landers earthquake as comprised of three fault segments: a) the Johnson Valley Fault, b) Homestead Fault and c) Camp Rock Fault.
Intellectual Merit Earthquakes are not always confined to a single fault. To compute ground motion from possible future earthquakes it will be necessary to compute ground motion from scenarios where an earthquake occurs on multiple faults, e.g. UCERF3. Any such method has to be validated against data from earthquakes known to have ruptured multiple faults, such as 1992 Landers and 1999 Hector Mine. We have extended the UCSB Method for broadband ground motion simulations to include ruptures on multiple faults. In this project, we compared results of the simulations with data from the 1992 Landers earthquake.
Broader Impacts UCERF3 gives probabilities of future rupture forecasts, but it does not provide ground motion estimates which will be critical to earthquake engineering. The SCEC broadband platform has to be extended to ruptures on multiple faults if one is going to estimate ground motion parameters as is done in Cybershake.
Exemplary Figure Figure (4): (top) For each sub-fault we show the moment-rate function lagged in time due to the incorporation of the rupture delay at each fault segment. (middle) We show the color-coded ground motion generated by each sub-fault, and (bottom) we show the total ground motion.