Tamarah King, Mark Quigley, Dan Clark

The 10th March 1970 moment magnitude (Mw) 5.0 Calingiri earthquake surface rupture is 3.3 km long with a maximum vertical displacement of 0.4 m. The fault as defined by surface measurements is a shallow-dipping reverse fault (~ 20° east) with a probable shallow hypocentre (< 1 km). This is consistent with published hypocentral depths, though large uncertainties exist within the seismological data. The finest-resolution geological map available for the epicentral area (1:250 000) indicates the presence of granitic gneiss and migmatite outcrops within a few kilometres of the surface rupture with foliations striking sub-parallel to the surface rupture trace but with near-vertical dips. The rupture is subparallel to linear geophysical anomalies suggesting a bedrock structural control to faulting. There is no evidence to suggest prior Pleistocene surface rupture along the Calingiri scarp, although no detailed palaeoseismic investigations have been conducted.