Detecting fluid circulation by electric field variations at the Nankai Trough

Details Detecting fluid circulation by electric field variations at the Nankai Trough Detecting fluid circulation by electric field variations at the Nankai Trough

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992e%26psl.109..469s&link_type=abstract

Earth and Planetary Science Letters, Volume 109, Issue 3, p. 469-476.

Computer Science

6

Scientific paper

An ocean bottom electrometerOBEL was installed at the end of August 1989 on the landward slope of the Nankai Trough (33°38.56′N, 137°54.54′E, 3790 m deep). This electrometer has 40 m long electrodes, which were extended with the aid of the manipulators of the submersibleNautile. The electrometer was successfully retrieved at the end of November 1989, having provided electric field variations comprising both north-south and east-west components for as long as 80 days. The data obtained were analyzed by applying theBAYTAP-G analysis software, which was developed originally for the analysis of the Earth Tide. The electric field variations were divided into geomagnetic induction, oceanic tide and long-period trend components. The residual trend component was obtained by subtracting the oceanic dynamo effect caused by the strong western boundary ocean current around the Kaiko-Nankai area from the trend component. An order estimation of streaming potential variations has proved that the residual component thus obtained may be a direct monitor of the subsurface fluid venting through faults. The numerous colonies of clam shells that have been found in this area also indicate sub-surface fluid venting through faults.

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