6afa9eac-8d8f-4483-a349-da83fd424134 urn:uuid eng UTF-8 nonGeographicDataset nonGeographicDataset 2025-10-16T19:13:15 creation ISO 19115 2016 Re-evaluating the seismic hazard potential of the northern Lapstone Structural Complex 6afa9eac-8d8f-4483-a349-da83fd424134 Based upon a structural model for the LSC involving a large west-dipping thrust fault beneath the Lapstone Monocline, a recent study of seismic hazard in the Sydney Basin identified the LSC as a potential source for large and damaging earthquakes, and estimated a recurrence for MW >7.0 events at 15-30 ka (IGNS, 1999). The preliminary results presented here from Mountain Lagoon, a small lake abutting the Kurrajong Fault, indicate that only 15m of fault displacement has occurred since the catchments upstream became too dissected to generate significant fluvial flow. A qualitative assessment of the time required to reconstruct the catchment to a size where a sandstone fault barrier could be eroded suggests that the observed displacement is all that has occurred in the last several million years or more. This indicates potential recurrence rates for large earthquakes are, on average, in the order of hundreds of thousands of years or more. {"type": "Polygon", "coordinates": [[[150.46666, -33.65], [150.766666, -33.65], [150.766666, -33.38333], [150.46666, -33.38333], [150.46666, -33.65]]]} 150.46666 150.766666 -33.65 -33.38333 AU-NSW Abstract Earth Sciences External Publication Published_External earthquakes geohazards geomorphology Link to article documentDigital Link to article PDF Unnamed resource documentDigital HTML