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

Hiroo Wada, Fumiaki Takeuchi, Takeshi Mikumo, Yuji Kurata, Satoru Kuriyama, Makoto Koizumi, Kazuro Hirahara, Norio Hirano, Satoshi Kaneshima, Toru Nakamura, Kinya Nishigami, Kazuo Oike, Takuo Shibutani, Takahiro Okura, Naoshi Hirata, Toshihiko Kanazawa, Shoji Tomita, Tetsuichiro Yabuki, Tooru Ooida, Akira IkamiMasaru Nakamura, Harumi Aoki, Iwao Fujii, Rikio Miyajima, Mamoru Yamada, Fumihito Yamazaki, Akira Ikami, Sadaomi Suzuki, Akihiko Yamamoto, Takeo Moriya, Hiroki Miyamachi, Ken Ichiro Yamashina, Kaname Sakai, Megumi Mizoue, Toshio Haneda, Masayoshi Takahashi, Tameshige Tsukuda, Shin Ichi Hashimoto, Yukio Ishiketa, Ikuo Karakama, Masaru Kobayashi, Katsumi Miura, Isao Nakamura, Akio Takagi, Toshio Kono, Akira Hasegawa, Shigeki Horiuchi, Toru Matsuzawa, Yasuhiro Umeda, Yoshihisa Iio, Kiyoshi Ito, Akio Kuroiso, Tatsuo Saeki, Akihiko Ito, Masahiro Kosuga, Kazuaki Miura, Atsushi Nakajima, Masayuki Suzuki, Toshio Mitsunami, Takuo Okamoto, Toru Ouchi, Toshikazu Tanada, Manabu Yokohama

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)343-360
Number of pages18
Journaljournal of physics of the earth
Volume40
Issue number2
DOIs
Publication statusPublished - Jan 1 1992

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velocity structure
P-wave
wave velocity
S-wave
dislocation
earthquake
rupture
geodetic datum
strong motion
arrival time
seismic velocity
gravity anomaly
upper crust
travel time
explosion
spacing
volcano
geology
sea level
well

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)

Cite this

Three-Dimensional P and S Wave Velocity Structure in the Focal Region of the 1984 Western Nagano Prefecture Earthquake. / Wada, Hiroo; Takeuchi, Fumiaki; Mikumo, Takeshi; Kurata, Yuji; Kuriyama, Satoru; Koizumi, Makoto; Hirahara, Kazuro; Hirano, Norio; Kaneshima, Satoshi; Nakamura, Toru; Nishigami, Kinya; Oike, Kazuo; Shibutani, Takuo; Okura, Takahiro; Hirata, Naoshi; Kanazawa, Toshihiko; Tomita, Shoji; Yabuki, Tetsuichiro; Ooida, Tooru; Ikami, Akira; Nakamura, Masaru; Aoki, Harumi; Fujii, Iwao; Miyajima, Rikio; Yamada, Mamoru; Yamazaki, Fumihito; Ikami, Akira; Suzuki, Sadaomi; Yamamoto, Akihiko; Moriya, Takeo; Miyamachi, Hiroki; Yamashina, Ken Ichiro; Sakai, Kaname; Mizoue, Megumi; Haneda, Toshio; Takahashi, Masayoshi; Tsukuda, Tameshige; Hashimoto, Shin Ichi; Ishiketa, Yukio; Karakama, Ikuo; Kobayashi, Masaru; Miura, Katsumi; Nakamura, Isao; Takagi, Akio; Kono, Toshio; Hasegawa, Akira; Horiuchi, Shigeki; Matsuzawa, Toru; Umeda, Yasuhiro; Iio, Yoshihisa; Ito, Kiyoshi; Kuroiso, Akio; Saeki, Tatsuo; Ito, Akihiko; Kosuga, Masahiro; Miura, Kazuaki; Nakajima, Atsushi; Suzuki, Masayuki; Mitsunami, Toshio; Okamoto, Takuo; Ouchi, Toru; Tanada, Toshikazu; Yokohama, Manabu.

In: journal of physics of the earth, Vol. 40, No. 2, 01.01.1992, p. 343-360.

Research output: Contribution to journalArticle

Wada, H, Takeuchi, F, Mikumo, T, Kurata, Y, Kuriyama, S, Koizumi, M, Hirahara, K, Hirano, N, Kaneshima, S, Nakamura, T, Nishigami, K, Oike, K, Shibutani, T, Okura, T, Hirata, N, Kanazawa, T, Tomita, S, Yabuki, T, Ooida, T, Ikami, A, Nakamura, M, Aoki, H, Fujii, I, Miyajima, R, Yamada, M, Yamazaki, F, Ikami, A, Suzuki, S, Yamamoto, A, Moriya, T, Miyamachi, H, Yamashina, KI, Sakai, K, Mizoue, M, Haneda, T, Takahashi, M, Tsukuda, T, Hashimoto, SI, Ishiketa, Y, Karakama, I, Kobayashi, M, Miura, K, Nakamura, I, Takagi, A, Kono, T, Hasegawa, A, Horiuchi, S, Matsuzawa, T, Umeda, Y, Iio, Y, Ito, K, Kuroiso, A, Saeki, T, Ito, A, Kosuga, M, Miura, K, Nakajima, A, Suzuki, M, Mitsunami, T, Okamoto, T, Ouchi, T, Tanada, T & Yokohama, M 1992, 'Three-Dimensional P and S Wave Velocity Structure in the Focal Region of the 1984 Western Nagano Prefecture Earthquake', journal of physics of the earth, vol. 40, no. 2, pp. 343-360. https://doi.org/10.4294/jpe1952.40.343
Wada, Hiroo ; Takeuchi, Fumiaki ; Mikumo, Takeshi ; Kurata, Yuji ; Kuriyama, Satoru ; Koizumi, Makoto ; Hirahara, Kazuro ; Hirano, Norio ; Kaneshima, Satoshi ; Nakamura, Toru ; Nishigami, Kinya ; Oike, Kazuo ; Shibutani, Takuo ; Okura, Takahiro ; Hirata, Naoshi ; Kanazawa, Toshihiko ; Tomita, Shoji ; Yabuki, Tetsuichiro ; Ooida, Tooru ; Ikami, Akira ; Nakamura, Masaru ; Aoki, Harumi ; Fujii, Iwao ; Miyajima, Rikio ; Yamada, Mamoru ; Yamazaki, Fumihito ; Ikami, Akira ; Suzuki, Sadaomi ; Yamamoto, Akihiko ; Moriya, Takeo ; Miyamachi, Hiroki ; Yamashina, Ken Ichiro ; Sakai, Kaname ; Mizoue, Megumi ; Haneda, Toshio ; Takahashi, Masayoshi ; Tsukuda, Tameshige ; Hashimoto, Shin Ichi ; Ishiketa, Yukio ; Karakama, Ikuo ; Kobayashi, Masaru ; Miura, Katsumi ; Nakamura, Isao ; Takagi, Akio ; Kono, Toshio ; Hasegawa, Akira ; Horiuchi, Shigeki ; Matsuzawa, Toru ; Umeda, Yasuhiro ; Iio, Yoshihisa ; Ito, Kiyoshi ; Kuroiso, Akio ; Saeki, Tatsuo ; Ito, Akihiko ; Kosuga, Masahiro ; Miura, Kazuaki ; Nakajima, Atsushi ; Suzuki, Masayuki ; Mitsunami, Toshio ; Okamoto, Takuo ; Ouchi, Toru ; Tanada, Toshikazu ; Yokohama, Manabu. / Three-Dimensional P and S Wave Velocity Structure in the Focal Region of the 1984 Western Nagano Prefecture Earthquake. In: journal of physics of the earth. 1992 ; Vol. 40, No. 2. pp. 343-360.
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T1 - Three-Dimensional P and S Wave Velocity Structure in the Focal Region of the 1984 Western Nagano Prefecture Earthquake

AU - Wada, Hiroo

AU - Takeuchi, Fumiaki

AU - Mikumo, Takeshi

AU - Kurata, Yuji

AU - Kuriyama, Satoru

AU - Koizumi, Makoto

AU - Hirahara, Kazuro

AU - Hirano, Norio

AU - Kaneshima, Satoshi

AU - Nakamura, Toru

AU - Nishigami, Kinya

AU - Oike, Kazuo

AU - Shibutani, Takuo

AU - Okura, Takahiro

AU - Hirata, Naoshi

AU - Kanazawa, Toshihiko

AU - Tomita, Shoji

AU - Yabuki, Tetsuichiro

AU - Ooida, Tooru

AU - Ikami, Akira

AU - Nakamura, Masaru

AU - Aoki, Harumi

AU - Fujii, Iwao

AU - Miyajima, Rikio

AU - Yamada, Mamoru

AU - Yamazaki, Fumihito

AU - Ikami, Akira

AU - Suzuki, Sadaomi

AU - Yamamoto, Akihiko

AU - Moriya, Takeo

AU - Miyamachi, Hiroki

AU - Yamashina, Ken Ichiro

AU - Sakai, Kaname

AU - Mizoue, Megumi

AU - Haneda, Toshio

AU - Takahashi, Masayoshi

AU - Tsukuda, Tameshige

AU - Hashimoto, Shin Ichi

AU - Ishiketa, Yukio

AU - Karakama, Ikuo

AU - Kobayashi, Masaru

AU - Miura, Katsumi

AU - Nakamura, Isao

AU - Takagi, Akio

AU - Kono, Toshio

AU - Hasegawa, Akira

AU - Horiuchi, Shigeki

AU - Matsuzawa, Toru

AU - Umeda, Yasuhiro

AU - Iio, Yoshihisa

AU - Ito, Kiyoshi

AU - Kuroiso, Akio

AU - Saeki, Tatsuo

AU - Ito, Akihiko

AU - Kosuga, Masahiro

AU - Miura, Kazuaki

AU - Nakajima, Atsushi

AU - Suzuki, Masayuki

AU - Mitsunami, Toshio

AU - Okamoto, Takuo

AU - Ouchi, Toru

AU - Tanada, Toshikazu

AU - Yokohama, Manabu

PY - 1992/1/1

Y1 - 1992/1/1

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