Geomagnetic variations and electrical conductivity structure in south-western Australia

Everett, Jim; Hyndman, R. D.

doi:10.1016/0031-9201(67)90005-2

Cited by 170 publications

(90 citation statements)

References 11 publications

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“…3. The "shield" curve shows the response found by EVERETT and HYNDMAN (1967) on the south west Australian coast and the "tectonic" curve is a summary of the California coast response (SCHMUCKER, 1970). Our results show quite striking agreement with the Australian south-east coast results and with the step model of Bennett and Lilley.…”

Section: Comparison Of the Coast Effect With Other Studiessupporting

confidence: 81%

“…In Australia observations have been made on both the south west and south east corners of the continent (EVERETT and HYNDMAN, 1967;BENNETT and LILLEY, 1971). These, together with other studies made in North America (SCHMUCKER, 1970;COCHRANE and HYNDMAN, 1970;HYNDMAN and COCHRANE, 1971) tend to show a decay pattern of the coast effect with distance from the continental edge which is characteristic of the geological history of the continental crust.…”

Section: Introductionmentioning

confidence: 67%

“…While this may be a useful geophysical tool there has been only limited agreement so farr between coast effect decay patterns observed on different continents throughout the world. The results from south west Australia (EVERETT and HYNDMAN, 1967) represent the only shield response to have been observed (see Fig. 8) and although the observations from the younger continental areas in Australia LILLEY, 1971), Western Canada (COCHRANE andHYNDMAN, 1970) and the California coast (SCHMUCKER, 1970) show a much more rapid decay, none quite agrees with any of the others.…”

Section: Introductionmentioning

confidence: 67%

“…This demonstrates that the hypothesis that the coast effect"signature" depends on the geological history of the continental material is a valid one. It encourages us to try to reproduce EVERETT and HYNDMAN's (1967)"shield" curve with a profile of magnetometers across a shield area on the west coast of South Australia. …”

mentioning

confidence: 99%

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The coast effect in geomagnetic variations in South Australia.

White

Polatajko

1978

J. geomagn. geoelec

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A profile of seven magnetometers, extending from a sea floor magnetometer at the edge of the continental shelf to one situated 300 km inland, recorded geomagnetic variations during November/December 1976. The observations show a particularly uncomplicated coast effect variation. When the in-phase amplitude of the transfer function at 1 cycle per hour is plotted against distance from the continent edge it shows a striking resemblance to the results obtained on the south-east Australian coast by BENNETT and LILLEY (1971). This demonstrates that the hypothesis that the coast effect"signature" depends on the geological history of the continental material is a valid one. It encourages us to try to reproduce EVERETT and HYNDMAN's (1967)"shield" curve with a profile of magnetometers across a shield area on the west coast of South Australia.

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Section: Comparison Of the Coast Effect With Other Studiessupporting

confidence: 81%

Section: Introductionmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 67%

mentioning

confidence: 99%

See 2 more Smart Citations

The coast effect in geomagnetic variations in South Australia.

White

Polatajko

1978

J. geomagn. geoelec

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“…So, in principle, magnetovariational methods, such as geomagnetic deep sounding (GDS) and transfer function analysis (e.g. Everett and Hyndman, 1967;Banks, 2007) should be able to detect changes in the conductivity distribution of local crustal features related to earthquakes, such as seismogenic faults and other associated tectonic and geological structures.…”

Section: Introductionmentioning

confidence: 99%

Magnetic transfer function entropy and the 2009 <i>M</i><sub>w</sub> = 6.3 L'Aquila earthquake (Central Italy)

Cianchini

Santis

Barraclough

et al. 2012

Nonlin. Processes Geophys.

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Abstract. With the aim of obtaining a deeper knowledge of the physical phenomena associated with the 2009 L'Aquila (Central Italy) seismic sequence, culminating with a M w = 6.3 earthquake on 6 April 2009, and possibly of identifying some kind of earthquake-related magnetic or geoelectric anomaly, we analyse the geomagnetic field components measured at the magnetic observatory of L'Aquila and their variations in time. In particular, trends of magnetic transfer functions in the years 2006-2010 are inspected. They are calculated from the horizontal to vertical magnetic component ratio in the frequency domain, and are very sensitive to deep and lateral geoelectric characteristics of the measurement site. Entropy analysis, carried out from the transfer functions with the so called transfer function entropy, points out clear temporal burst regimes of a few distinct harmonics preceding the main shock of the seismic sequence. A possible explanation is that they could be related to deep fluid migrations and/or to variations in the micro-/meso-fracturing that affected significantly the conductivity (ordered/disordered) distribution in a large lithospheric volume under the seismogenic layer below L'Aquila area. This interpretation is also supported by the analysis of hypocentres depths before the main shock occurrence.

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Global signal classification of ULF geomagnetic field variations using interstation transfer function

2005

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SUMMARYIn order to study earthquake-related ULF geomagnetic field changes, it is important to discriminate the signal from the other noises such as magnetic pulsations originated from solar activity and artificial noises from the DC driven train and factories. For this goal, the interstation transfer function method with wavelet transform has been applied to data observed in the ULF electromagnetic sensor array at Boso Peninsula, Japan. The results indicate that the proposed method has the capacity to eliminate the global signal.

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Geomagnetic variations and electrical conductivity structure in south-western Australia

Cited by 170 publications

References 11 publications

The coast effect in geomagnetic variations in South Australia.

The coast effect in geomagnetic variations in South Australia.

Magnetic transfer function entropy and the 2009 <i>M</i><sub>w</sub> = 6.3 L'Aquila earthquake (Central Italy)

Global signal classification of ULF geomagnetic field variations using interstation transfer function

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Geomagnetic variations and electrical conductivity structure in south-western Australia

Cited by 170 publications

References 11 publications

The coast effect in geomagnetic variations in South Australia.

The coast effect in geomagnetic variations in South Australia.

Magnetic transfer function entropy and the 2009 &lt;i&gt;M&lt;/i&gt;&lt;sub&gt;w&lt;/sub&gt; = 6.3 L'Aquila earthquake (Central Italy)

Global signal classification of ULF geomagnetic field variations using interstation transfer function

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Magnetic transfer function entropy and the 2009 <i>M</i><sub>w</sub> = 6.3 L'Aquila earthquake (Central Italy)