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Fleurieu Peninsula Earthquakes

Fleurieu Peninsula Earthquakes Hypocentres 3D model location100 earthquakes from the South Australian earthquake catalogue, between 2007 to mid-2015, were selected in an area of the Fleurieu Peninsula with the densest seismograph coverage.

The model consists of an earthquake magnitude map, ranging from near 0.0 to 3.8 near Mount Barker and a ‘quake reliability’ map showing the error ellipses (2σ) of the hypocentres.

The model includes surface elevation exaggerated 5 times, a super-imposed solid geology map and fault network surfaces. Very little is known of the location of the major faults. The surfaces have been constructed using the mapped surface expression at an angle of 45 degrees in the generally expected dip direction. All the faults have been extended to a depth of 10 km, except the Bremer Fault, which has been extended to 5 km.

The model shows that, contrary to accepted wisdom, the earthquakes do not fall on particular fault planes, but are scattered quite widely. It also shows that the majority occur deeper than 10 km. There is no clear pattern; some areas seem to have many small events, but the largest event seems to be in a volume that otherwise has very few events.

Fleurieu Peninsula Earthquakes 3D geological model

Fleurieu Peninsula Earthquakes 3D Model

Note: these models are presented as a 'proof of concept' only and their accuracy (spatial or otherwise) should not be relied upon for exploration or other decision making processes.

Publication Date: September 2009

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Flinders Ranges Earthquake Hypocentres

Flinders Ranges Earthquake Hypocentres 3D model location A joint Geoscience Australia–Mineral Resources Division survey from September 2003 to July 2005 used 18 seismographs, including some Australian National Seismic Imaging Resource (ANSIR) equipment, located in the North Mount Lofty and Flinders Ranges to detect earthquakes.

Over 500 earthquakes were located. Of these 289 better quality hypocentres were selected for display. Locations with large horizontal, vertical or origin time errors, or with large gap angles were removed. The remaining hypocentres are plotted with their location error ellipsoids (2σ) to demonstrate the possible location errors.

This is the first earthquake dataset for this area that is suitable for comparison of earthquakes with geology and topography in 3D.

Flinders Ranges Earthquake Hypocentres 3D model

Flinders Ranges Earthquake Hypocentres 3D Model

Note: these models are presented as a 'proof of concept' only and their accuracy (spatial or otherwise) should not be relied upon for exploration or other decision making processes.

Publication Date: September 2009

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For more information, contact:

George Gouthas
Project Geoscientist
+61 8 8463 3073
george.gouthas@sa.gov.au