Long-term temperatures measurements at some onland and sub-seafloor boreholes

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概要

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• Spatio-temporal distribution of temperature beneath the seafloor provides essential information on the thermal and hydrological structure and dynamics. We developed some long-term temperature monitoring systems for observation at seafloor, in a few-m-deep hole, and in deep boreholes. Measurements in a shallow hole were carried out at a hydrothermal field in the southern Mariana Trough and in the western Sagami Bay, and thermistor array system was tested in two onland boreholes in the northeastern Japan for up to 1.5 years. The thermistor elements coated with 'Teflon' was proved to be stable and reliable in a temperature range of 0 to 80 °C for more than one year. Shorter time scale and rather aperiodic variations in temperatures were commonly observed in boreholes. These variations would result from convection or any kind of flow within the hole. Such variation can be as large as any signal from the formation, so more careful assessment is necessary for the deep-borehole observatory that is in development at JAMSTEC.

• 独立行政法人海洋研究開発機構の論文

著者

• ITO HISAO

  Center for Deep Earth Exploration, Japan Agency for Marine-Earth Science and Technology

• KINOSHITA MASATAKA

  Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology

• Ito Hisao

  Center For Deep Earth Exploration Japan Agency For Marine-earth Science And Technology

• Kasaya Takafumi

  Institute For Research On Earth Evolution Japan Agency For Marine-earth Science And Technology

• Kinoshita Masataka

  Institute for Research on Earth Evolution (IFREE), Japan Agency for Marine-Earth Science and Technology (JAMSTEC)

• Sayanagi Keizo

  Institute of Oceanic Research and Development, Tokai University

• Araki Eiichiro

  Dense Oceanfloor Network System for Earthquakes and Tsunamis, Japan Agency for Marine-Earth Science and Technology

• Kasaya Takafumi

  Institute for Research on Earth Evolution (IFREE), Japan Agency for Marine-Earth Science and Technology (JAMSTEC)

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• Recent progress of the Electro-Magnetic survey to investigate Earth's interior
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