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. A shallow Mw  5.3 earthquake near Lake Muir in thestable continental region (SCR) crust of southwest Western Australia on the16 September 2018 was followed on the 8 November by aproximal Mw  5.2 event. Focal mechanisms produced for the events suggestreverse and strike-slip rupture, respectively. Field mapping, guided bySentinel-1 InSAR data, reveals that the first event produced an approximately3 km long and up to 0.4–0.6 m high west-facing surface rupture, consistentwith reverse slip on a moderately east-dipping fault. The InSAR data alsoshow that the surface scarp relates to a subsurface rupture ∼ 5 km long, bound at its northern and southern extremities bybedrock structures. The November event produced a surface deformationenvelope that is spatially coincident with that of the September event butdid not result in discrete surface rupture. Almost 900 aftershockswere recorded by a temporary seismometer deployment. Hypocentre locationscorrelate poorly with the rupture plane of their respective mainshocks butcorrelate well with regions of increased Coulomb stress. The spatial andtemporal relationships between the Mw>5.0 events andtheir aftershocks reveals dependencies with implications for how other lesswell-documented SCR earthquake sequences could be interpreted. Furthermore,the September Mw  5.3 Lake Muir earthquake was the ninth event documentedto have produced surface rupture in Australia in historical times. Thesenine ruptures are located exclusively in the Precambrian non-extended SCRrocks of central and western Australia, and none could have been identifiedand mapped using topographic signature prior to the historical event.Consistent, though fragmentary, evidence exists from analogous regionsworldwide. Our analysis of the Lake Muir earthquake sequence thereforeprovides constraint on models describing mechanisms for strain accumulationand localized release as earthquakes in non-extended SRC crust.

solid earth

Surface deformation relating to the 2018 Lake Muir earthquake sequence, southwest Western Australia: new insight into stable continental region earthquakes