Fleurieu Peninsula Earthquake Hypocentres 3D Model (3D pdf version 1)
Published: 17 Nov 1915 Created: 10 Dec 2024 Revised: 10 Apr 2025

For populating the subject 3D model, records of 100 earthquake events, that had occurred between 2007 to mid-2015 in an area of the Fleurieu Peninsula with the densest seismograph coverage, were selected from the South Australian earthquake...

For populating the subject 3D model, records of 100 earthquake events, that had occurred between 2007 to mid-2015 in an area of the Fleurieu Peninsula with the densest seismograph coverage, were selected from the South Australian earthquake catalogue. The event data were carefully checked, and some recalculations and deletions were applied to improve their quality. The earthquake magnitude layer displays event data ranging from the largest, a magnitude 3.8 occurring near Mount Barker in 2010, to the smallest, one of close to magnitude 0.0. These earthquakes have been located using a standard regional velocity model, not a local one. Changes caused by using a local model are expected to be relatively small, and affect all depths proportionately. The model includes the location of all the seismographs as at 2015. The surface elevation has been exaggerated 5 times to improve visibility. The displayed ‘area of interest’ polygon encloses the area with the densest seismograph coverage. Inside the polygon, hypocentres are generally more accurate. Poorer quality data have been removed. Hypocentres outside the polygon have not been included, because their accuracy decreases significantly. The ‘quake reliability’ layer shows the error ellipses (2 sigma) of the hypocentres, which demonstrate their possible location errors. The solid geology component of the model comes from the DSD spatial data library. The faults included are (from west to east): Para, Eden-Burnside, Ochre Cove, Willunga, Bremer and Palmer. Very little is known of the subsurface location of the major faults. The fault surfaces have been constructed using the mapped surface expression taken from the spatial data library, extrapolated at an angle of 45 degrees in the generally expected dip direction. The faults mapped at surface on the western side of the peninsula dip under the Mount Lofty Ranges. The Palmer Fault dips to the west. The Bremer Fault is expected to dip to the east. The fault positions are extended to 10 km depth in the model, except for the Bremer Fault, which has been extended to only 5 km depth. The subject visualisation model provides the first instance of an earthquake dataset for this particular area that is suitable to use for comparing the loci of earthquakes with geology and topography in 3D.

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About this record

Record No mesac26544
Topic Geoscientific Information
Type of Resource Model
Category Type
Document Type
Contributor Geological Survey of South Australia. Sutton Institute for Earthquake Physics;Geological Survey of South Australia. Geophysics and Prospectivity Team
Sponsor Chief Geoscientist, Mapping and Exploration, GSSA
Geological Province
Mine Name
Stratigraphy
Commodity
    Notes
    Notes: The accuracy of this model (spatial or otherwise) should not be relied upon for exploration or other decision-making processes. Vertical accuracy of the topography and earthquake hypocentres are variable due to resampling (topographic...

    Notes: The accuracy of this model (spatial or otherwise) should not be relied upon for exploration or other decision-making processes. Vertical accuracy of the topography and earthquake hypocentres are variable due to resampling (topographic surface) and interpretation (earthquake hypocentres). Geographic Locality: Fleurieu Peninsula;Southern Mount Lofty Ranges Doc No: GDP 00035

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    Language English
    Metadata Standard ISO 19115-3

    Citations

    Use constraints License
    License Creative Commons Attribution 4.0
    Persistent identifier https://pid.sarig.sa.gov.au/model/mesac26544
    Citation Love, D.;Gouthas, G. 1915. Fleurieu Peninsula Earthquake Hypocentres 3D Model (3D pdf version 1)
    https://pid.sarig.sa.gov.au/model/mesac26544

    Technical information

    Status
    Maintenance and Update Frequency
    Geographic Reference GDA2020 (EPSG:7844)
    Geo bounding box {"type":"Polygon","coordinates":[[[138,-35.5],[139,-35.5],[139,-35],[138,-35],[138,-35.5]]]}
    Purpose
    
                        
                        
    
                        
                      
    Lineage