Skip to Main Content
Skip Nav Destination
GEOREF RECORD

Refinements to the Graves-Pitarka kinematic rupture generator, including a dynamically consistent slip rate function, applied to the 2019 Mw 7.1 Ridgecrest earthquake

Arben Pitarka, Robert Graves, Kojiro Irikura, Ken Miyakoshi, Changjiang Wu, Hiroshi Kawase, Arthur Rodgers and David McCallen
Refinements to the Graves-Pitarka kinematic rupture generator, including a dynamically consistent slip rate function, applied to the 2019 Mw 7.1 Ridgecrest earthquake
Bulletin of the Seismological Society of America (October 2021) 112 (1): 287-306

Abstract

The main objective of this study is to develop physics-based constraints on the spatiotemporal variation of the slip-rate function using a simplified dynamic rupture model. First, we performed dynamic rupture modeling of the 2019 Mw 7.1 Ridgecrest, California, earthquake, to analyze the effects of depth-dependent stress and material friction on slip rate. Then, we used our modeling results to guide refinements to the slip-rate function that were implemented in the Graves-Pitarka kinematic rupture generation technique. The dynamic ruptures were computed on a surface-rupturing, planar strike-slip fault that includes a weak (negative to low-stress-drop) zone in the upper 4 km of the crust. Below the weak zone, we placed high-stress-drop patches designed to mirror the large-slip areas seen in various rupture model inversions of the event. The locations of the high-stress-drop patches and the hypocenter were varied in multiple realizations to investigate how changing the dynamic conditions affected the resulting rupture kinematics, in particular, the slip rate. From these simulations, we observed a systematic change in the shape of the slip-rate function from Kostrov type below the weak zone to a predominantly symmetric shape within the weak zone, along with a depth-dependent reduction of peak slip rate. We generalized these shallow rupture features into a depth-dependent parametric variation of the slip-rate function and implemented it in the Graves-Pitarka kinematic rupture model generator. The performance of the updated kinematic approach was then verified in 0-4 Hz simulations of the Mw 7.1 Ridgecrest earthquake, which showed that incorporating the depth-dependent variation in the shape of the slip-rate function improves the fit to the observed near-fault ground motions in the 0.5-3 s period range.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 112
Serial Issue: 1
Title: Refinements to the Graves-Pitarka kinematic rupture generator, including a dynamically consistent slip rate function, applied to the 2019 Mw 7.1 Ridgecrest earthquake
Affiliation: Lawrence Livermore National Laboratory, Livermore, CA, United States
Pages: 287-306
Published: 20211012
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 112
Accession Number: 2021-067402
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, sect.
N35°04'60" - N36°00'00", W118°00'00" - W117°25'00"
Secondary Affiliation: U. S. Geological Survey, USA, United StatesAichi Institute of Technology, JPN, JapanGeo Research Institute, JPN, JapanNuclear Regulatory Authority, JPN, JapanKyoto University, Disaster Prevention Research Institute, JPN, JapanUniversity of Nevada, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2022, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202147
Close Modal

or Create an Account

Close Modal
Close Modal