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Observation of pressure change associated with hydrothermal upwelling at a seamount in the South Mariana Trough using an ocean bottom seismometer
Author(s) -
Sato Toshinori,
Kasahara Junzo,
Fujioka Kantaro
Publication year - 1995
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/95gl01314
Subject(s) - seamount , geology , upwelling , oceanography , hydrothermal vent , hydrothermal circulation , trough (economics) , seismometer , hydrophone , seismology , induced seismicity , ocean bottom , economics , macroeconomics
An OBSH (ocean bottom seismometer with hydrophone) was deployed just 1 m from a hot thermal vent on the summit region of a seamount located 18 km east of the south Mariana Trough axis to record continuous data on hydrothermal activity. Although the seismicity beneath the seamount was very weak, numerous pulse shape (pressure) events showing sudden pressure decrease were observed on the hydrophone channel. The characteristic period of the pressure events varied from 20 seconds to 1 minute. After the submersible Shinkai 6500 relocated the OBSH 10 m south of the vent, where no thermal vents existed, the number and amplitude of pressure events drastically decreased. This suggests that pressure events were generated by the hot water upwelling from the thermal vent. The pressure events appear to be related to the ocean tide. This experiment indicates that observations using OBSHs are an effective means of monitoring hydrothermal activity.