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New insight into the crust and upper mantle structure under Alaska
https://nipr.repo.nii.ac.jp/records/10068
https://nipr.repo.nii.ac.jp/records/10068f0b6529b-debb-4ce8-896f-aa028f1feb2c
Item type | 学術雑誌論文 / Journal Article(1) | |||||
---|---|---|---|---|---|---|
公開日 | 2014-10-15 | |||||
タイトル | ||||||
タイトル | New insight into the crust and upper mantle structure under Alaska | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | New insight into the crust and upper mantle structure under Alaska | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Seismic tomography | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Subduction zone | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Alaska | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Yakutat terrane | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Arc volcanism | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Seismic tomography | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Subduction zone | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Alaska | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Yakutat terrane | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Arc volcanism | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
アクセス権 | ||||||
アクセス権 | metadata only access | |||||
アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
著者 |
Qi, Cheng
× Qi, Cheng× Zhao, Dapeng× Chen, Yong× Ruppert, Natalia A.× Qi, Cheng× Zhao, Dapeng× Chen, Yong× Ruppert, Natalia A. |
|||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | To better understand the seismic structure of the subducting Pacific plate under Alaska, we determined the three-dimensional P-wave velocity structure to a depth of approximately 200 km beneath Alaska using 438,146 P-wave arrival times from 10,900 earthquakes. In this study an irregular grid parameterization was adopted to express the velocity structure under Alaska. The number of grid nodes increases from north to south in the study area so that the spacing between grid nodes is approximately the same in the longitude direction. Our results suggest that the subducting Pacific slab under Alaska can be divided into three different parts based on its geometry and velocity structure. The western part has features similar to those in other subduction zones. In the central part a thick low-velocity zone is imaged at the top of the subducting Pacific slab beneath north of the Kenai Peninsula, which is believed to be most likely the oceanic crust plus an overlying serpentinized zone and the coupled Yakutat terrane subducted with the Pacific slab. In the eastern part, significant high-velocity anomalies are visible to 60-90 km depth, suggesting that the Pacific slab has only subducted down to that depth. | |||||
内容記述 | ||||||
内容記述タイプ | Other | |||||
内容記述 | アラスカで発生した地震(10900個)のP波到達時刻(43万8146走時)を用いて、アラスカの下に沈み込む太平洋プレートの三次元速度構造を不均一格子パラメーター法を用いて深さ 200km まで解析しました。その結果、アラスカに沈み込む太平洋プレートは3つに大別されることが示唆されました。アラスカ西部は、他の沈み込み帯と類似した構造ですが、中央部ではケナイ半島北部の太平洋プレート上部に厚い低速度層があることが分かりました。これは、海洋地殻上部に蛇紋岩帯が横たわり、ヤクタットテレーンも一緒に沈み込んでいるためと思われます。東部では顕著な高速度層が 60-90km の深度に見られ、太平洋プレートはこの深さまでしか沈み込んでいないと考えられます。 | |||||
書誌情報 |
Polar science en : Polar science 巻 1, 号 2, p. 85-100, 発行日 2007-12 |
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出版者 | ||||||
出版者 | 国立極地研究所 | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 18739652 | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA12240481 | |||||
論文ID(NAID) | ||||||
識別子タイプ | NAID | |||||
関連識別子 | 110006596696 | |||||
DOI | ||||||
識別子タイプ | DOI | |||||
関連識別子 | http://doi.org/10.1016/j.polar.2007.07.001 | |||||
関連名称 | 10.1016/j.polar.2007.07.001 |