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  1. 防災科研関係論文

Variation in crustal structure along the Kyushu-Palau Ridge at 15-21o N on the Philippine Sea plate based on seismic refraction profiles

https://nied-repo.bosai.go.jp/records/5013
https://nied-repo.bosai.go.jp/records/5013
4b7774e7-3bfc-4a3b-8eb8-2fea22367973
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 en
タイトル Variation in crustal structure along the Kyushu-Palau Ridge at 15-21o N on the Philippine Sea plate based on seismic refraction profiles
著者 Nishizawa, A.

× Nishizawa, A.

en Nishizawa, A.

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Kaneda, K.

× Kaneda, K.

en Kaneda, K.

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Katagiri, Y.

× Katagiri, Y.

en Katagiri, Y.

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Kasahara, J.

× Kasahara, J.

en Kasahara, J.

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抄録
内容記述タイプ Other
内容記述 We acquired coincident wide-angle and multi-channel seismic reflection data along four profiles perpendicular to the Kyushu-Palau Ridge (KPR) between 15°N and 20°N on the Philippine Sea plate. The crustal thickness beneath the KPR, which is a remnant arc created in the Late Eocene, varies along the strike from 8 to approximately 20 km and is always thicker than the adjacent oceanic crust of the West Philippine Basin to the west and the Parece Vela Basin to the east. The thickest crust among the four profiles, which is primarily due to a thickening of the lower crust, is found where the KPR adjoins Oki-no-Tori-Shima Island. There is no clear evidence of the thick (>5 km) middle crustal layer with a P-wave velocity of 6.0-6.5 km/s that has been inferred beneath the conjugate rifted counterpart of the Izu-Ogasawara(Bonin)-Mariana Island-arc. Our results suggest that the crust of the KPR at 15-21°N represents a less mature island arc crust relative to that further north along the ridge where a mid-crustal layer of 6 km/s has been reported. Copyright © The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences; TERRAPUB.
言語 en
書誌情報 en : Earth, Planets and Space

巻 59, 号 6
ISSN
収録物識別子タイプ EISSN
収録物識別子 1880-5981
DOI
関連識別子 10.1186/bf03352711
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