Journal article

Rupture Characteristics and Bedrock Structural Control of the 2016 M-w 6.0 Intraplate Earthquake in the Petermann Ranges, Australia

Januka Attanayake, Tamarah R King, Mark C Quigley, Gary Gibson, Dan Clark, Abraham Jones, Sarah L Brennand, Mike Sandiford

BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA | SEISMOLOGICAL SOC AMER | Published : 2020

Abstract

The 20 May 2016 surface-rupturing intraplate earthquake in the Petermann Ranges is the largest onshore earthquake to occur in the Australian continent in 19 yr. We use in situ and Interferometric Synthetic Aperture Radar surface observations, aftershock distribution, and the fitting of P-wave source spectra to determine source properties of the Petermann earthquake. Surface observations reveal a 21-km-long surface rupture trace (strike 294° 29°) with heterogeneous vertical displacements ( 0:015) along rupture-parallel phyllosilicate-rich surfaces within the host rock fabric with possible additional contributions from elevated pore-fluid pressures.

Grants

Awarded by Australian Research Council


Funding Acknowledgements

The University of Melbourne's (UoM) temporary seismic array was funded by AuScope's Australian Geophysical Observing System (AGOS) Subsurface Observatory through an Education Investment Fund (EIF) grant. Geoscience Australia contributed data from four additional seismographs to the study. In addition, Geological Survey of South Australia (GSSA) contributed some equipment to the UoM temporary array. Mark C. Quigley is supported by the Australian Research Council through Discovery Grant Number DP170103350, and Tamarah R. King is supported through the Australian Government Research Training Program Scholarship. Dan Clark and Sarah L. Brennand publish with the permission of the CEO of Geoscience Australia. This article underwent two cycles of revision, during which Associate Editors Cezar Trifu and Mark Stirling along with three anonymous reviewers provided constructive comments.