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Re-evaluating the seismic hazard potential of the northern Lapstone Structural Complex

Created 17/10/2025

Updated 17/10/2025

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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.

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Field Value
Title Re-evaluating the seismic hazard potential of the northern Lapstone Structural Complex
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/6afa9eac-8d8f-4483-a349-da83fd424134
Contact Point
Geoscience Australia Data
clientservices@ga.gov.au
Reference Period 22/04/2018
Geospatial Coverage
Map data © OpenStreetMap contributors
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      ],
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      ],
      [
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      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Geoscience Australia

Data Source

This dataset was originally found on Geoscience Australia "Re-evaluating the seismic hazard potential of the northern Lapstone Structural Complex". Please visit the source to access the original metadata of the dataset:
https://ecat.ga.gov.au/geonetwork/srv/eng/csw/dataset/re-evaluating-the-seismic-hazard-potential-of-the-northern-lapstone-structural-complex