The total-field geomagnetic coast effect: The CICADA97 line from deep Tasman Sea to inland New South Wales

Adrian P. Hitchman; Peter R. Milligan; F.E.M. (Ted) Lilley; Antony White; Graham S. Heinson

doi:10.1071/EG00052

ISSN: 0812-3985
E-ISSN: 1834-7533

The total-field geomagnetic coast effect: The CICADA97 line from deep Tasman Sea to inland New South Wales
Authors Adrian P. Hitchman^a, Peter R. Milligan^b, F.E.M. (Ted) Lilley^c, Antony White^d and Graham S. Heinson^e
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^a Research School of Earth Sciences The Australian National University, Canberra ACT 0200 Phone: (02) 6249 3424, Facsimile: (02) 6249 0738, Email: [email protected] ^b Australian Geological Survey Organisation, GPO Box 378 Canberra ACT 2601 Phone: (02) 6249 9224, Facsimile: (02) 6249 9913, Email: [email protected] ^c Research School of Earth Sciences The Australian National University, Canberra ACT 0200 Phone: (02) 6249 4174, Facsimile: (02) 6249 0738, Email: [email protected] ^d School of Earth Sciences The Flinders University of South Australia, GPO Box 2100, Adelaide, SA, 5001, Phone: (08) 8201 2359, Facsimile: (08) 8201 2676, Email: [email protected] ^e School of Earth Sciences The Flinders University of South Australia, GPO Box 2100, Adelaide, SA, 5001, Phone: (08) 8201 2607, Facsimile: (08) 8201 2676, Email: [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 31, Issue 1-2, Mar 2000, p. 52 - 57
DOI: https://doi.org/10.1071/EG00052
- Published online: 01 Mar 2000

Abstract

In the CICADA97 experiment a line of simultaneously recording stationary vector magnetometers was deployed from inland NSW, across the east Australian coast, and into the Tasman Sea. The purpose of the experiment was to investigate the effect of electrical conductivity structure near a coastline on natural timevariations in Earth’s magnetic field. Aeromagnetic surveys regularly take place in such coastal areas, and removal of time variations of the magnetic field is a prime task of data reduction. CICADA97 data show that long-period variations of the total field are systematically enhanced near the NSW coast, while spatial patterns of short-period variations (such as pulsations) may be strongly influenced by electrical conductivity structures on a smaller scale, such as bays and inlets.

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Article Type: Research Article

Keyword(s): Aeromagnetics; coast effect; electromagnetic induction; micropulsations; total magnetic field

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The total-field geomagnetic coast effect: The CICADA97 line from deep Tasman Sea to inland New South Wales

Abstract

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