Journal article

Surface slip distributions and geometric complexity of intraplate reverse-faulting earthquakes

Haibin Yang, Mark Quigley, Tamarah King

GEOLOGICAL SOCIETY OF AMERICA BULLETIN | GEOLOGICAL SOC AMER, INC | Published : 2021

Abstract

Earthquake ground surface ruptures provide insights into faulting mechanics and inform seismic hazard analyses. We analyze surface ruptures for 11 historical (1968–2018) moment magnitude (Mw) 4.7–6.6 reverse earthquakes in Australia using statistical techniques and compare their characteristics with magnetic, gravity, and stress trajectory data sets. Of the total combined (summative) length of all surface ruptures (∼148 km), 133 km (90%) to 145 km (98%) align with the geophysical structure in the host basement rocks. Surface rupture length (SRL), maximum displacement (MD), and probability of surface rupture at a specified Mw are high compared with equivalent Mw earthquakes globally. This is ..

View full abstract

Grants

Awarded by Australian Research Council


Funding Acknowledgements

We would like to acknowledge the Noongar people of southwest Western Australia, the Warumungu people of Tennant Creek, and the Antakirinja, Yankunytjatjara, and Pitjantjatjara people of the Western Desert and A.angu Pitjantjatjara Yankunytjatjara (APY) lands in South Australia/Northern Territory, as the traditional custodians of the land on which all historic surface ruptures occurred, and where the data described in this paper were collected. This research was funded by the Australian Research Council through Discovery Grant DP170103350 to M. Quigley. We acknowledge the contributions of Dan Clark and Trevor Allen from Geoscience Australia toward enhancing our knowledge of Australian earthquakes. T. King received support from the David Hay Postgraduate Writing-Up Award (University of Melbourne). H. Yang received the Melbourne Research Scholarship, the Baragwanath Travel Scholarship, and the Albert Shimmins Writing-Up Award from the University of Melbourne to assist in research development. Geophysical maps were produced using the Generic Mapping Tools (GMT) package (Wessel et al., 2013).