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7 results on '"Takuo Okamoto"'

2. OBSERVATION OF MICROTREMOR IN KATSUYAMA BASIN, FUKUI PREFECTURE CARRIED OUT THROUGH THE MICROTREMOR RESEARCH CAMP

Author

Shigeo Higuchi, Masahiro Morita, Nobuaki Kitamura, Masaaki Ohba, Naoki Maeda, Shohei Kaneko, Hiroyuki Fujiwara, Keisuke Kojima, Haruki Kitamura, Takuo Okamoto, Hidekazu Yamamoto, Shohei Naito, Yuta Asaka, Takumi Hayashida, Yusuke Oishi, Yoshinobu Iwanami, Koki Tatsuta, Masaho Yoshida, Koji Yamada, Michihiro Ohori, Taishi Ueno, Shinichiro Mori, Yuki Uratani, Tatsuya Noguchi, Toshiki Nakai, Masayuki Yamada, Koji Hada, Sho Nakai, Shohei Yoshida, Tomohiro Mizuno, Gen Furuya, Shigeki Adachi, Masaki Ito, Satoshi Kurita, Fumika Sato, Masashi Miyazaki, and Hiroki Azuma

Subjects
010504 meteorology & atmospheric sciences, Microtremor, Structural basin, 010502 geochemistry & geophysics, 01 natural sciences, Seismology, Geology, 0105 earth and related environmental sciences
Published
2018
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3. Focal Mechanism Analyses of Aftershocks of the 1984 Western Nagano Prefecture Earthquake

Author

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

Subjects
geography, Focal mechanism, geography.geographical_feature_category, Volcano, Epicenter, General Earth and Planetary Sciences, Fracture zone, Fault (geology), Far East, Earthquake swarm, Geology, Seismology, Aftershock
Abstract

Focal mechanisms around Ontake Volcano, central Japan, were investigated by using the data set obtained by a seismic observation project of the 1986 Joint Seismological Research in Western Nagano Prefecture (JSR'86). The data set included P-wave first motions of aftershocks of the 1984 Western Nagano Prefecture Earthquake (M=6.8) mainly. A total of 556 events was selected for the focal mechanism analysis. The P-wave data from the surrounding university routine networks were also utilized additionally. Four hundred two events were successfully analyzed. Based on the types of focal mechanisms and on the spatial distribution of the events, we classify these events into the following 4 groups: (1) events of strike-slip fault type with a common nodal plane parallel to the ENE-WSW striking nodal plane in the fracture zone of the 1984 main shock; (2) events of reverse fault type in the area of the preexisting earthquake swarm to the northeast of the main shock, in a possible relation with an earthquake swarm activated by the main shock; (3) events of reverse fault type that occurred near the largest aftershock (M=6.2), but are not the continued aftershock sequence of the largest aftershock; (4) events of strike-slip fault type at depths to the easternmost part where no activity had been observed before the operation of JSR'86. The plural types of focal mechanisms obtained and the spatial distribution of foci suggest a complex seismo-tectonic structure that consists of at least 2 kinds of fracturings around Ontake Volcano.

Published
1992
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4. Hypocenter Locations by a Dense Network

Author

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

Subjects
Seismometer, Hypocenter, Observation period, General Earth and Planetary Sciences, Seismogram, Joint (geology), Geology, Aftershock, Seismology
Abstract

A dense temporary seismograph network was set up in the aftershock area of the 1984 Western Nagano Prefecture Earthquake of M 6.8 by the group for the 1986 Joint Seismological Research in Western Nagano Prefecture. Seismograms of about 1,500 events were obtained during the observation period of 52 days from September 1 to October 22, 1986, and 530 events in and around the aftershock area were located precisely. Extent of the aftershock area is about 20 km in the east-west and about 7 km in the north-south.

Published
1992
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5. Three-Dimensional P and S Wave Velocity Structure in the Focal Region of the 1984 Western Nagano Prefecture Earthquake

Author

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

Subjects
geography, geography.geographical_feature_category, Inversion (geology), Geodetic datum, Fault (geology), Geodesy, Volcano, S-wave, General Earth and Planetary Sciences, Joint (geology), Bouguer anomaly, Geology, Sea level, Seismology
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.

Published
1992
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7. [Studies on the adrenocortical functions in patients with nephrotic syndrome during administration of ACTH-Z]

Author

Yoritoshi MISHINA, Osamu YAMASHITA, Takuo NAKAGAWA, Mitsuo TANIGUCHI, Takuo OKAMOTO, Yukitoshi KYO, Kenji MATSUOKA, Mitsuo NAKAMURA, Haruyoshi AKAMATSU, and Susumu MARUMOTO

Subjects
Adult, Male, medicine.medical_specialty, Nephrotic Syndrome, business.industry, General Medicine, medicine.disease, Gastroenterology, Adrenocorticotropic Hormone, Adrenal Cortex Hormones, Internal medicine, Adrenal Glands, medicine, Humans, In patient, Female, business, Administration (government), Nephrotic syndrome
Published
1970

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