Research report of the crust and upper mantle structure in the Okinawa Trough, off west Kyushu by using ocean bottom seismometers

Kazou Nakahigashi; Masanao Shinohara; Sadaomi Suzuki; Hiroshi Takenaka; Nobuki Kame; Kenji Uehira; Hajime Shiobara; Toshihiko Kanazawa; Ryota Hino; Minoru Nishino; Takeshi Sato; Shinji Yoneshima

Research report of the crust and upper mantle structure in the Okinawa Trough, off west Kyushu by using ocean bottom seismometers

Kazou Nakahigashi, Masanao Shinohara, Sadaomi Suzuki, Hiroshi Takenaka, Nobuki Kame, Kenji Uehira, Hajime Shiobara, Toshihiko Kanazawa, Ryota Hino, Minoru Nishino, Takeshi Sato, Shinji Yoneshima

SCI - Research Center for Prediction of Earthquakes and Volcanic Eruptions (RCPEVE)

Research output: Contribution to journal › Article › peer-review

Abstract

The Okinawa Trough is located in the back-arc region of the Ryukyu Island arc, and is considered to be an active spreading area. In fall of 1999, seismic survey using ocean bottom seismometers was conducted to obtain the detailed seismic structure in the northernmost part of the Okinawa Trough. The total crust thickness is 25 km including a sedimentary layer. The velocity of the upper crust changes from 5.7-6.0 km/s in the upper part to 6.1-6.2 km/s in the lower part. And its thickness changes from 3 km to 9 km. The lower crust of which velocity slightly changes from 6.5-6.7 km/s in the upper part to 6.8-6.9 km/s in the lower part has uniform thickness of about 15 km. The Pn velocity is determined to be 7.7-7.8 km/s. The seismic structure suggests that the northernmost part of the Okinawa Trough is in the incipient stage of a backarc rifting.

Original language	English
Pages (from-to)	69-107
Number of pages	39
Journal	Science Reports of the Kyushu University, Department of Earth and Planetary Sciences
Volume	21
Issue number	3
Publication status	Published - 2004 Jan

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Nakahigashi, K., Shinohara, M., Suzuki, S., Takenaka, H., Kame, N., Uehira, K., Shiobara, H., Kanazawa, T., Hino, R., Nishino, M., Sato, T., & Yoneshima, S. (2004). Research report of the crust and upper mantle structure in the Okinawa Trough, off west Kyushu by using ocean bottom seismometers. Science Reports of the Kyushu University, Department of Earth and Planetary Sciences, 21(3), 69-107.

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title = "Research report of the crust and upper mantle structure in the Okinawa Trough, off west Kyushu by using ocean bottom seismometers",

abstract = "The Okinawa Trough is located in the back-arc region of the Ryukyu Island arc, and is considered to be an active spreading area. In fall of 1999, seismic survey using ocean bottom seismometers was conducted to obtain the detailed seismic structure in the northernmost part of the Okinawa Trough. The total crust thickness is 25 km including a sedimentary layer. The velocity of the upper crust changes from 5.7-6.0 km/s in the upper part to 6.1-6.2 km/s in the lower part. And its thickness changes from 3 km to 9 km. The lower crust of which velocity slightly changes from 6.5-6.7 km/s in the upper part to 6.8-6.9 km/s in the lower part has uniform thickness of about 15 km. The Pn velocity is determined to be 7.7-7.8 km/s. The seismic structure suggests that the northernmost part of the Okinawa Trough is in the incipient stage of a backarc rifting.",

author = "Kazou Nakahigashi and Masanao Shinohara and Sadaomi Suzuki and Hiroshi Takenaka and Nobuki Kame and Kenji Uehira and Hajime Shiobara and Toshihiko Kanazawa and Ryota Hino and Minoru Nishino and Takeshi Sato and Shinji Yoneshima",

year = "2004",

month = jan,

language = "English",

volume = "21",

pages = "69--107",

journal = "Science Reports of the Kyushu University, Department of Earth and Planetary Sciences",

issn = "1348-0545",

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number = "3",

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Nakahigashi, K, Shinohara, M, Suzuki, S, Takenaka, H, Kame, N, Uehira, K, Shiobara, H, Kanazawa, T, Hino, R, Nishino, M, Sato, T & Yoneshima, S 2004, 'Research report of the crust and upper mantle structure in the Okinawa Trough, off west Kyushu by using ocean bottom seismometers', Science Reports of the Kyushu University, Department of Earth and Planetary Sciences, vol. 21, no. 3, pp. 69-107.

Research report of the crust and upper mantle structure in the Okinawa Trough, off west Kyushu by using ocean bottom seismometers. / Nakahigashi, Kazou; Shinohara, Masanao; Suzuki, Sadaomi et al.
In: Science Reports of the Kyushu University, Department of Earth and Planetary Sciences, Vol. 21, No. 3, 01.2004, p. 69-107.

Research output: Contribution to journal › Article › peer-review

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T1 - Research report of the crust and upper mantle structure in the Okinawa Trough, off west Kyushu by using ocean bottom seismometers

AU - Nakahigashi, Kazou

AU - Shinohara, Masanao

AU - Suzuki, Sadaomi

AU - Takenaka, Hiroshi

AU - Kame, Nobuki

AU - Uehira, Kenji

AU - Shiobara, Hajime

AU - Kanazawa, Toshihiko

AU - Hino, Ryota

AU - Nishino, Minoru

AU - Sato, Takeshi

AU - Yoneshima, Shinji

PY - 2004/1

Y1 - 2004/1

N2 - The Okinawa Trough is located in the back-arc region of the Ryukyu Island arc, and is considered to be an active spreading area. In fall of 1999, seismic survey using ocean bottom seismometers was conducted to obtain the detailed seismic structure in the northernmost part of the Okinawa Trough. The total crust thickness is 25 km including a sedimentary layer. The velocity of the upper crust changes from 5.7-6.0 km/s in the upper part to 6.1-6.2 km/s in the lower part. And its thickness changes from 3 km to 9 km. The lower crust of which velocity slightly changes from 6.5-6.7 km/s in the upper part to 6.8-6.9 km/s in the lower part has uniform thickness of about 15 km. The Pn velocity is determined to be 7.7-7.8 km/s. The seismic structure suggests that the northernmost part of the Okinawa Trough is in the incipient stage of a backarc rifting.

AB - The Okinawa Trough is located in the back-arc region of the Ryukyu Island arc, and is considered to be an active spreading area. In fall of 1999, seismic survey using ocean bottom seismometers was conducted to obtain the detailed seismic structure in the northernmost part of the Okinawa Trough. The total crust thickness is 25 km including a sedimentary layer. The velocity of the upper crust changes from 5.7-6.0 km/s in the upper part to 6.1-6.2 km/s in the lower part. And its thickness changes from 3 km to 9 km. The lower crust of which velocity slightly changes from 6.5-6.7 km/s in the upper part to 6.8-6.9 km/s in the lower part has uniform thickness of about 15 km. The Pn velocity is determined to be 7.7-7.8 km/s. The seismic structure suggests that the northernmost part of the Okinawa Trough is in the incipient stage of a backarc rifting.

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JO - Science Reports of the Kyushu University, Department of Earth and Planetary Sciences

JF - Science Reports of the Kyushu University, Department of Earth and Planetary Sciences

IS - 3

ER -

Research report of the crust and upper mantle structure in the Okinawa Trough, off west Kyushu by using ocean bottom seismometers

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