Review paper: The 20th May 2016 Mw 6.1 Petermann surface rupturing earthquake, Australia

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Tamarah King, Mark Quigley, Dan Clark


The 20th May 2016 Mw 6.1 Petermann earthquake produced a 21 km long surface rupture with a maximum vertical offset of 0.9 m. Geological and geophysical data provide strong evidence that rupture occurred along a mylonite foliation plane with an orientation defined by deformation from the nearby Woodroffe Thrust, a major Neoproterozoic terrane suture. The most geologically and seismologically reasonable fault model involves 2 bedrock-controlled faults with slightly oblique orientations. In this model, rupture propagates from a hypocentre at ≤ 4 km depth, with a centroid of slip located at the inferred intersection of the two faults at 1 km depth. No evidence of prior rupture has been identified in the landscape or in shallow trenches crossing the rupture.



Earth Sciences, Geology, Geophysics and Seismology, Physical Sciences and Mathematics, Tectonics and Structure


australian earthquake, surface rupture, Environmental earthquake effects, Environmental seismic intensity scale, intraplate earthquake, reverse fault, surface rupturing earthquake, multi-fault earthquake


Published: 2019-08-18 03:53


CC BY Attribution 4.0 International

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