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  1. 防災科研関係論文

Geometry and spatial variations of seismic reflection intensity of the upper surface of the Philippine Sea plate off the Boso Peninsula, Japan

https://nied-repo.bosai.go.jp/records/2824
https://nied-repo.bosai.go.jp/records/2824
0e4d898b-48e5-459b-8fd8-597ccb5a432b
Item type researchmap(1)
公開日 2023-03-30
タイトル
言語 ja
タイトル Geometry and spatial variations of seismic reflection intensity of the upper surface of the Philippine Sea plate off the Boso Peninsula, Japan
タイトル
言語 en
タイトル Geometry and spatial variations of seismic reflection intensity of the upper surface of the Philippine Sea plate off the Boso Peninsula, Japan
言語
言語 eng
著者 Akihiro Kono

× Akihiro Kono

ja Akihiro Kono

en Akihiro Kono

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Toshinori Sato

× Toshinori Sato

ja Toshinori Sato

en Toshinori Sato

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Masanao Shinohara

× Masanao Shinohara

ja Masanao Shinohara

en Masanao Shinohara

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Kimihiro Mochizuki

× Kimihiro Mochizuki

ja Kimihiro Mochizuki

en Kimihiro Mochizuki

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Tomoaki Yamada

× Tomoaki Yamada

ja Tomoaki Yamada

en Tomoaki Yamada

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Kenji Uehira

× Kenji Uehira

ja Kenji Uehira

en Kenji Uehira

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Takashi Shinbo

× Takashi Shinbo

ja Takashi Shinbo

en Takashi Shinbo

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Yuya Machida

× Yuya Machida

ja Yuya Machida

en Yuya Machida

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Ryota Hino

× Ryota Hino

ja Ryota Hino

en Ryota Hino

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Ryousuke Azuma

× Ryousuke Azuma

ja Ryousuke Azuma

en Ryousuke Azuma

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抄録
内容記述タイプ Other
内容記述 In the region off the Boso Peninsula, Japan, the Pacific plate is subducting westward beneath both the Honshu island arc and Philippine Sea plate, while the Philippine Sea plate is subducting northwestward beneath the Honshu island arc. These complex tectonic interactions have caused numerous seismic events occurred in the past. To better understand these seismic events, it is important to determine the geometry of the plate boundary, in particular the upper surface of the Philippine Sea plate. We conducted an active-source seismic refraction survey in July and August 2009 from which we obtained a 2-D P-wave velocity structure model along a 216-km profile. We used the velocity model and previously published data that indicate a P-wave velocity of 5.0?km/s for the upper surface of the subducting Philippine Sea plate to delineate its boundary with the overriding Honshu island arc. Our isodepth contours of the upper surface of the Philippine Sea plate show that its dip is shallow at depths of 10 to 15?km, far off the Boso Peninsula. This shallow dip may be a result of interference from the Pacific plate slab, which is subducting westward under the Philippine Sea plate. Within our survey data, we recognized numerous seismic reflections of variable intensity, some of which came from the upper surface of the Philippine Sea plate. An area of high seismic reflection intensity corresponds with the main slip area of the Boso slow slip events. Our modeling indicates that those reflections can be explained by an inhomogeneous layer close to the upper surface of the Philippine Sea plate.
言語 en
書誌情報 ja : Tectonophysics
en : Tectonophysics

巻 709, p. 44-54, 発行日 2017-07
出版者
言語 en
出版者 Elsevier BV
ISSN
収録物識別子タイプ EISSN
収録物識別子 1879-3266
DOI
関連識別子 10.1016/j.tecto.2017.05.001
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