Flinders Ranges Earthquakes 3D model

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About the Flinders Ranges Earthquakes 3D model

Geographic extent

The Flinders Ranges region is located in South Australia to the north of Adelaide. The data in this model covers the majority of South Australia.

Contents

This VRML model contains DEM surface, satellite image, elevation image, surface geology image, gravity image, magnetic image, seismic stations and earthquake events mapped in their true three dimensional locations for the Flinders Ranges and surrounding region.

Size

Approximately 4 MB. Startup download only 200 KB - remaining data downloads when layers are selected.

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Metadata

Earthquake Patterns in the Flinders Ranges

Temporary Network 2003-2006 - Preliminary Results

The Flinders Ranges region of South Australia is an area of high topographic relief and high seismicity. This combined with the fact that several faults identified in the Flinders and Mt. Lofty Ranges region have relatively high Quaternary slip rates indicates this is a region of pronounced neotectonic activity. However, we have a very poor understanding of what relationship exists, if any, between the earthquakes and faults. Similarly, because the tectonic stress field in this part of Australia is poorly determined, we do not have a clear understanding of the relationship between the stress field and active faults.

The Flinders Ranges region also exhibits high heat flow, which would suggest a shallow seismogenic crust, and yet earthquake hypocentres, albeit often highly uncertain, indicate that seismicity extends to lower crustal depths. Finally, this high heat flow and the unique crustal structure of the Adelaide Fold Belt may lead to propagation characteristics of earthquake waves that differ from other parts of Australia.

During the period September 2003 - June 2005, Geoscience Australia and Primary Industry and Resources, South Australia (PIRSA) collaborated in a temporary seismograph deployment in the Flinders Ranges region. This deployment consisted of about 18 stations spaced at roughly 30 km intervals. Among the questions about the Flinders Ranges region which this deployment was intended to address were:

• Which faults are seismically active?
• What is the depth of the seismogenic crust?
• Is the earthquake ground motion similar to other parts of Australia?
• How can the regional stress field be characterised?

Over 500 locatable earthquakes were recorded within the network and surrounding areas. This 3D model displays these earthquakes at their true three dimensional location. These data are currently being analysed to determine what their relationship may be to faults, what constraint they place on the crustal stress field, and how earthquake waves propagate in the geologic environment of the Adelaide Fold Belt.

Coordinates

Projection

Lambert Conformal Conic

False Easting: 0.00
False Northing: 0.00
Central Meridian: 134.00
Standard Parallel 1: -18.00
Standard Parallel 2: -36.00
Latitude of Origin: 0.00

Datum

World Geodetic System (WGS84)

Bounding box

• Top left:    131.25 E   26 S
• Bottom right: 142 E   36.5 S

Translation

• X shift:            -230631
• Y shift:          +3545681
• X Y Z scale:  1 / 100000

This translation has been applied to enhance graphics performance within this model.

Data Source

The data used to create the Coastline, Cities & Towns and Major Lakes layers used in this model are publicly available from the Geoscience Australia website and extracted from the seamless Australia wide and beyond mosaic created from the 1:1 million scale Digital Chart of the World (DCW). The data used to create the Digital Elevation Model (DEM) and Image Overlays used in this model have been sourced from these datasets;

• Satellite Image: Year 2000 Landsat ETM+ 100m Data of Australia - Imagery
• Elevation Model & DEM: Mosaiced 3 Arc-second SRTM Dataset
• Surface Geology: Surface Geology of Australia 1:1,000,000 scale, South Australia - Preliminary Edition
• Gravity: Australian National Gravity Database 0.5 Minute Grid - 2 December 2005
• Magnetics: Fourth Edition Total Magnetic Anomaly (TMI) Grids of Australia

Product Information

For a complete metadata reference, please see the ANZLIC metadata record 9630.

For product information, please see Geocat record 65092.

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