AusMT / surveys / Southwest Western Australia Array

Southwest Western Australia Array GDS

Geomagnetic depth sounding survey · Western Australia · Flinders University

Part of the Australia legacy GDS collection

Twenty-two magnetometer stations cover the south-west corner of Western Australia, between 115.

About this survey

Twenty-two magnetometer stations cover the south-west corner of Western Australia, between 115.07 and 120.84 degrees east and 32.04 and 35.04 degrees south: a run along the south coast from Leeuwin through Denmark, Albany and Bremer Bay to Munglinup, and an inland group across the wheatbelt from Beverley and Narrogin east to Varley. The locality names are a reading of the coordinates and the three letter station codes; no source prints them. The array is known only from the Australian Electromagnetic Database, the register of Australian induction arrows compiled by Liejun Wang at the Australian National University. No publication, field record, operator or acquisition date has been found for it. On AusMT's reading the station numbers are the serial numbers of the Flinders University fluxgate magnetometers designed by Francois Chamalaun and Bob Walker, numbers that recur in the Skippy-3 array of 1994 and the Halls Creek Orogen array of 2000; that points to one Flinders instrument fleet but does not show that those instruments recorded these stations. It is not J. E. Everett and R. D. Hyndman's 1966 traverse, which comes no closer than 44.7 km to any of these stations, and it is absent from the 1998 thesis catalogue of the database's compiler.

The register holds vertical magnetic field transfer functions at seventeen periods from 389 to 27,307 s, with standard errors on both magnitude and direction. A response set reaching 27,307 s implies long recordings, though no source states a duration. The register contains 22 station locations; transfer functions have been recovered for 20 of them, LEE12A and DAR29A carrying no values in any source. No publication or thesis reports this array, so a doubtful register value cannot be checked against anything.

The served values are vertical magnetic field transfer functions at seventeen periods from 389 to 27,307 s, for 20 of the array's 22 stations. They come from reference code 15 of Liejun Wang's Australian Electromagnetic Database, the induction arrow register compiled at the Australian National University; no earlier printed source for them has been found, so who computed them, and from what recordings, is unknown. The register prints one standard error on both the arrow magnitude and its direction, and those uncertainties travel with the served values. The coordinates are the register's own station positions, and the original recordings are not held.

Data and downloads

Stations (20)

Contributors and organisations

Organisation

Flinders University

Licence

CC BY 4.0

Identifiers and provenance

Machine-readable survey record · catalogue schema mtcat 2.0