Simulation of multi-segment kinematic rupture of the 1992 Landers earthquake and ground motion validation of ground motion

Jorge G. Crempien, & Ralph J. Archuleta

Published August 25, 2016, SCEC Contribution #6989, 2016 SCEC Annual Meeting Poster #289

The ability of earthquake rupture to jump across faults, or to propagate on complex faults with multiple bends can significantly affect the ground motion different sites might experience in the near source region. Based on the dynamic rupture simulations of the 1992 Mw7.2 Landers earthquake by Tago et al. (2012), we have constructed a simple database of moment partitioning and rupture initiation between the different segments. With this information we have proceeded to simulate several kinematic rupture realization using the UCSB method (Schmedes et al., 2013; Crempien and Archuleta, 2015) for each of the three main ruptured fault-segments: Camp Rock, Homestead and Johnson Valley faults. The total moment is partitioned proportionally to the area of each fault segment. We use the same moment correlation length scaling law of Mai and Beroza (2002) for all three segments.We simulate ground motion for all three fault-segments and sum the contribution of each segment. The time delay between the segments is based on the results of Tago et al. (2012), though they are not necessarily exactly the same. We compare the ground motion synthetics to actual recording using different validation metrics reported by Goulet et al. (2015). Preliminary results show almost no bias in response spectrum with respect to actual recording. We also explore the bias with randomization of the parameters related to moment partitioning and rupture timing of each fault-segment.

Key Words
multi-segment; ground motion

Citation
Crempien, J. G., & Archuleta, R. J. (2016, 08). Simulation of multi-segment kinematic rupture of the 1992 Landers earthquake and ground motion validation of ground motion. Poster Presentation at 2016 SCEC Annual Meeting.

Related Projects & Working Groups
Ground Motion Simulation Validation (GMSV)