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Center for Deep Earth Exploration (CDEX)

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T-Limit

The "Temperature limit of the Deep Biosphere off Muroto (T-Limit) " project required drilling and coring up to 1200 m below sea floor. This was to achieve the goal of investigating the sub-seafloor biosphere off Cape Muroto, where there is a geothermal gradient over 100℃/km, in the Nankai Trough.

An LTBMS was installed into the borehole, which had an estimated max temperature of 120℃ at the bottom, to examine the relationship between temperature and the biosphere limits. The key target of this LTBMS was to measure borehole temperature distribution in a high temperature environment.

Current Status

  • A temporary-type LTBMS temperature logger.

    A temporary-type LTBMS temperature logger.

  • A temperature logger string of a temporary-type LTBMS.

    A temperature logger string of a temporary-type LTBMS.

  • A permanent-type LTBMS communication test.

    A permanent-type LTBMS communication test.

  • Making up a permanent-type LTBMS.

    Making up a permanent-type LTBMS.

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