Magnetovariational measurements in the Cook Strait region of New Zealand

Details Magnetovariational measurements in the Cook Strait region of New Zealand Magnetovariational measurements in the Cook Strait region of New Zealand

Aug 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pepi...39..182i&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 39, Issue 3, p. 182-193.

Physics

6

Scientific paper

Magnetovariational measurements have been made at 10 sites on the northern side of the Cook Strait, New Zealand. Single-station transfer functions have been calculated for the sites and indicate that the effect of induction in the shallow water of the Cook Strait is most important at around 1000 s period. At longer periods the effect of induced currents in the Pacific Ocean predominates.
A two-dimensional electrical conductivity model including local conductivity structure has been shown to satisfy the measured responses at sites about 60-80 km distance from the strait. Closer to the strait the inductive process is strongly three-dimensional. A simple d.c. line current model of current flow has been shown to reproduce some of the features of the observed responses.
Induction arrows indicate the existence of conductivity anomalies associated with a known lateral seismic boundary and with one of the two principal faults in the region.

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