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JAEA Reports

High density electric survey around the Horonobe Underground Research Laboratory, 3

Nakamura, Takahiro; Sanada, Hiroyuki; Sugita, Yutaka; Teshima, Minoru*; Kasagi, Toshio*; Kishimoto, Munemaru*; Deguchi, Tomonori*; Makuuchi, Ayumu*

JAEA-Research 2010-006, 68 Pages, 2010/06

JAEA-Research-2010-006.pdf:33.19MB

The present document is to report the result of geophysical survey by electric survey around a site proposed for the Horonobe Underground Research Laboratory Project at Horonobe-cho, Hokkaido by the Japan Atomic Energy Agency. This Electric survey using pole-pole array in Horonobe Underground Research Laboratory Area was the third survey. Resistivity distribution near surface was about 20 $$Omega$$$$cdot$$m and it become to about 2 $$Omega$$$$cdot$$m as the depth increasing. Resistivity distribution was good agreement with existing survey results and existing electrical resistivity log data. By comparing resistivity model with hydrology model, it was confirmed that resistivity reflected the density of salinity. The range and distribution trends of apparent resistivity in this year were similar to the results of last year. It is thought that the data in which reproducibility is high is acquired in this survey. The influence on the underground water flow by construction is not admitted now.

JAEA Reports

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Matsuo, Koichi*; Yokoi, Koichi*; Negi, Tateyuki*; Kasagi, Toshio*; Takahashi, Takeharu*; Teshima, Minoru*

JNC TJ5410 2005-001, 142 Pages, 2005/03

JNC-TJ5410-2005-001.pdf:18.35MB

The present document is to report the result of resistivity monitoring by using MT(Magnetotelluric) method near the site proposed for the Horonobe Underground Research Program at Horonobe-cho, Hokkaido by the Japan Nuclear Cycle Development Institute. The stationary MT observation system, installed near the HDB-1 borehole on November 2002, was moved to a site at the Hokusei-en, 4km west of the first site. This system is monitoring for the depth of underground resistivity. 0bservation data at the Hokusei-en from February 1st 2004 to January 31st 2005 was added in the investigation in 2004 fiscal year. But, data cannot be acquired from July 8th to November 11th of 2004 due to the disconnection trouble of the optical fiber cable for data transfer.The results were as follows

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