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Three-Dimensional P and S Wave Velocity Structure in the Focal Region of the 1984 Western Nagano Prefecture Earthquake.

1992; Volume: 40; Issue: 2 Linguagem: Inglês

10.4294/jpe1952.40.343

1884-2305

Kazuro Hirahara, Naoshi Hirata, Akira Ikami, Hiroki Miyamachi, Tetsuichiro Yabuki, Harumi Aoki, Iwao Fujii, Toshio Haneda, Akira Hasegawa, Shinichi Hashimoto, N. Hirano, Shigeki Horiuchi, Yoshihisa Iio, Yukio Ishiketa, Akihiko Ito, Kiyoshi Ito, T. Kanazawa, Satoshi Kaneshima, Ikuo Karakama, Masaru Kobayashi, M. Koizumi, Toshio Kono, Masahiro Kosuga, Yuji Kurata, Satoru Kuriyama, Akio Kuroiso, Toru Matsuzawa, Takeshi Mikumo, Toshio Mitsunami, Katsumi Miura, Kazuaki Miura, Rikio Miyajima, Megumi Mizoue, Takeo Moriya, Atsushi Nakajima, Isao Nakamura, Masaru Nakamura, Toru Nakamura, K. Nishigami, Kazuo Oike, T. Okamoto, Takahiro Okura, Tooru OOIDA, Toru Ouchi, Tatsuo Saeki, Kaname Sakai, Takuo Shibutani, Masayuki Suzuki, Sadaomi Suzuki, Masayoshi Takahashi, Akio Takagi, Fumiaki Takeuchi, Toshikazu Tanada, Shoji Tomita, Tameshige Tsukuda, Yasuhiro Umeda, Hiroo Wada, Mamoru Yamada, Akihiko Yamamoto, Ken’ichiro Yamashina, Fumihito Yamazaki, Manabu Yokohama,

Earthquake Detection and Analysis

The detailed three-dimensional P and S wave velocity structure in the focal region of the 1984 Western Nagano Prefecture Earthquake occurring close to an active volcano, Mt. Ontake, central Japan, is derived from a tomographic inversion of travel time data obtained by the 1986 Joint Seismological Research in Western Nagano Prefecture. The data set includes 7, 693 P-wave and 6, 070 S-wave arrival times observed at 49 stations from 212 local earthquakes and 2 explosions. The velocities in the shallow portion of upper crust are determined at each grid point with its spacing of 1-2 km and good resolutions are obtained from the Earth's surface to a depth of 4 km. There exist strong lateral heterogeneities especially from the surface to a depth of 1 km. The seismic velocity map obtained in the height of 1 km above sea level well corresponds to the maps of surface geology and Bouguer gravity anomaly. This correspondence, however, is not so clear in the deeper layers. And, the greater the depth, the less heterogeneous the velocity structure. The velocity distribution on the fault seems to correspond to the distribution of dislocation and rupture front estimated from an analysis of strong motion and geodetic data: the low velocity region has the large amount of dislocation and the retarded rupture front.