Temperature measurements at IODP 337 Expedition, off Shimokita, NE Japan.

Yasuhiro Yamada, Kyoto University, Kyoto, Japan, Yoshinori Sanada, JAMSTEC Japan Agency for Marine-Earth Science and Technology, Kanagawa, Japan, Kyaw Moe, CDEX, Yokohama, Japan, Yusuke Kubo, JAMSTEC, KCC, Nankoku, Japan, Fumio Inagaki, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokohama, Japan and IODP Expedition 337 Scientists
Abstract:
Precise estimation of underground temperature is a challenging issue, since direct measurements require drill holes that disturb the original underground environment. During IODP 337 expedition, we have obtained in-situ temperature datasets for several times by using geophysical logging tools. A common procedure to estimate the undisturbed maximum underground temperature is by approximating that the ‘build-up’ pattern of measured values in the borehole should reach to the equilibrium temperature. At the Shimokita site, this was 63.7 oC at a depth of 2466 m. We have much more measurement dataset and all of these were used to analyze detailed in-site temperatures at various depths. The result shows a non-linear temperature profile to the depth and this may be reflected by the thermal properties of the surrounding rocks.
Back to: Physical Properties of Earth Materials (PPEM): Evolving Rock Structure I Posters