The preliminary result of marine electromagnetic data in the western Okinawa Trough offshore NE Taiwan
Abstract
We developed the ocean bottom electro-magnetometers (OBEM) and the ocean bottom seismometers (OBS) in the western Okinawa Trough, offshore NE Taiwan in end of March 2018, which successfully recovered all the instruments in end of May 2018. The water depth is around 1,400 m in the study area. The two horizontal magnetic fields show daily variation that correspond with geomagnetic fields onshore. We found that significant peaks appear simultaneously in the vertical magnetic field and two horizontal electrical fields. Active volcano and/or earthquakes might cause this phenomenon. To examine the interested unusual phenomenon, the study will compare with the seismic data collected by OBS. Furthermore, we expect to transform the electric fields and magnetic fields into the apparent resistivity in order to investigate the electrical structure of the Okinawa Trough. Although, the OBEM has acquired a high quality data set. The OBEM system still needs to be minor modifications, such as either the radio or flash beacons were functional failure in recovery operation and anchor, etc.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFMGP31C0734H
- Keywords:
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- 0925 Magnetic and electrical methods;
- EXPLORATION GEOPHYSICSDE: 1515 Geomagnetic induction;
- GEOMAGNETISM AND PALEOMAGNETISMDE: 3006 Marine electromagnetics;
- MARINE GEOLOGY AND GEOPHYSICSDE: 3914 Electrical properties;
- MINERAL PHYSICS