Tectonic pumping: earthquake-induced chemical flux detected in situ by a submarine cable experiment in Sagami Bay,Japan |
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| Authors: | Toshitaka Gamo Kei Okamura Kyohiko Mitsuzawa Kenichi Asakawa |
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| Affiliation: | *1Ocean Research Institute, the University of Tokyo, Tokyo, Japan.;*2Center for Advanced Marine Core Research, Kochi University, Kochi, Japan.;*3Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Kanagawa, Japan. |
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| Abstract: | We successfully deployed an in situ automatic chemical analyzer sensitive to manganese (Mn) in seawater for a period of 81 days for the first time on the deep seafloor of Sagami Bay along a convergent plate boundary south of Japan. The in situ Mn analyzer (GAMOS-IV) was connected to a submarine cable as a means to supply power and to relay real time data. During the observation period from April 5 till June 25, 2006, the amount of measured Mn was seen to increase abruptly up to 10 times that of the background level only on April 21, probably triggered by a M5.8 earthquake which occurred ∼7 km south-southwest of the observation site. This study demonstrates the suitability of submarine cables for the long-term geochemical monitoring of deep sea environments. |
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| Keywords: | submarine in situ Mn analyzer plate boundary temporal fluid venting earthquake submarine cable |
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