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Stochastic ground-motion simulation of the 2021 M (sub w) 5.9 Woods Point earthquake; facilitating local probabilistic seismic hazard analysis in Australia

Yuxiang Tang and P. Martin Mai
Stochastic ground-motion simulation of the 2021 M (sub w) 5.9 Woods Point earthquake; facilitating local probabilistic seismic hazard analysis in Australia
Bulletin of the Seismological Society of America (May 2023) 113 (5): 2119-2143

Abstract

The 2021 M (sub w) 5.9 Woods Point event is the largest onshore earthquake that has occurred in the recorded history of southeastern Australia since European settlement. To study its source and ground-motion characteristics and to extract information for local seismic hazard analysis, we employ a stochastic finite-fault simulation approach to simulate ground motions for this event based on the observations collected from 36 onshore stations. We determine the regional distance-dependent attenuation parameters using the horizontal Fourier acceleration amplitude spectrum in the frequency range of 0.1-20 Hz. We parameterize path parameters using different models to consider uncertainties and sensitivities. To investigate local site effects, we construct a V (sub S30) -based site amplification model. Source parameters are then determined by fitting the theoretical Brune's omega (super 2) model with a reference Fourier source spectrum at 1.0 km. The kappa (sub 0) value for the reference rock site is estimated as kappa (sub 0) =0.01 s, and dynamic stress drop is found to be 41.0 MPa by minimizing the overall absolute residual of 5% damped pseudospectral acceleration. We validate the simulations by comparing simulated and observed ground motions in terms of various intensity measurements; analyses of residuals show that the simulations are in good agreement with observations (average residual is close to 0). To facilitate future probabilistic seismic hazard analysis, six selected ground-motion models are ranked using the deviance information criteria based on an independent data set consisting of field observations and simulated ground motions.


ISSN: 0037-1106
EISSN: 1943-3573
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 113
Serial Issue: 5
Title: Stochastic ground-motion simulation of the 2021 M (sub w) 5.9 Woods Point earthquake; facilitating local probabilistic seismic hazard analysis in Australia
Affiliation: King Abdullah University of Science and Technology, PSE Division, Makkah, Saudi Arabia
Pages: 2119-2143
Published: 20230531
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 68
Accession Number: 2023-040808
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables
S40°00'00" - S34°00'00", E144°00'00" - E150°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2023, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202326
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