Three-dimensional resistivity structure and its relationship to the rupture of the 1997 Kagoshima earthquake doublet (Mw 6.1 and 6.0), Japan

Matsunaga, Keita*; Aizawa, Koki*; Asamori, Koichi; Ogawa, Hiroki*; Utsugi, Mitsuru*; Yoshimura, Ryokei*; Yamazaki, Kenichi*; Uchida, Kazunari*; Matsushima, Takeshi*; Inoue, Tomohiro*; et al.

Tectonophysics, 915, p.230880_1 - 230880_11, 2025/11

https://doi.org/10.1016/j.tecto.2025.230880

Current status of non-destructive checking techniques on Fast Breeder Reactor and its improvement

Yamashita, Takuya; Nishimura, Akihiko; Tsuchida, Noboru; Yamaguchi, Toshihiko; Oka, Kiyoshi; Fujiki, Kazunari*; Shimada, Yukihiro

no journal, , 

The preservation techniques of safety research on "Monju" and the next generation Fast Breeder Reactors have been exhibited. The exhibition consists of (1) EMAT, (2) ECT, (3) Laser Processing Head. Both (1) and (2) are the checking techniques for the cracks on nuclear power plants, while (3) is the repairing technique for the heat exchanger. In 2009, these three techniques will have been integrated to be a new probing system. The hybrid optical fiber has been involved in (3), which the project "photo-Medical Valley in JAEA-KANSAI are now developing as a fiber surgery device.

Three-dimensional resistivity structure of the epicenter area of the 1997 Kagoshima earthquake doublet, Japan

Matsunaga, Keita*; Aizawa, Koki*; Asamori, Koichi; Ogawa, Hiroki; Utsugi, Mitsuru*; Yoshimura, Ryokei*; Yamazaki, Kenichi*; Uchida, Kazunari*

no journal, , 

We estimated the 3-D resistivity structure around the epicenter of the 1997 Kagoshima Prefecture Northwestern Earthquake doublet in Japan by using broadband magneto-telluric (MT) data. The resistivity structure shows low-resistivity zones near the eastern and western edge of the aftershocks at depths of 5-10 km. The hypocenters of the M6 earthquakes are located near the edge of the low-resistivity zones. It is interesting that a prominent high resistivity zone is sandwiched by two low-resistivity zones at a depth of 0-3 km, and its location coincides with the distribution of the granodiorite body.