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Upper mantle anisotropy beneath Indochina block and adjacent regions from shear-wave splitting analysis of Vietnam broadband seismograph array data
https://nied-repo.bosai.go.jp/records/4353
https://nied-repo.bosai.go.jp/records/4353df9928cb-f4fb-448f-9c1e-c3e404a8ae11
| Item type | researchmap(1) | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 公開日 | 2023-03-30 | |||||||||||||||
| タイトル | ||||||||||||||||
| 言語 | en | |||||||||||||||
| タイトル | Upper mantle anisotropy beneath Indochina block and adjacent regions from shear-wave splitting analysis of Vietnam broadband seismograph array data | |||||||||||||||
| 言語 | ||||||||||||||||
| 言語 | eng | |||||||||||||||
| 著者 |
Ling Bai
× Ling Bai
× Takashi Iidaka
× Hitoshi Kawakatsu
× Yuichi Morita
× N. Q. Dzung
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| 抄録 | ||||||||||||||||
| 内容記述タイプ | Other | |||||||||||||||
| 内容記述 | The Indochina block is located at the junction of four major plates. It has a close relationship with the uplift of Tibet plateau and the sea-floor spreading of the South China Sea in the geological evolution histories. We deployed a temporary broadband seismograph array in Vietnam from February 2000 to October 2005, and measured shear-wave splitting of core-refracted phases to investigate the upper mantle anisotropy beneath the Indochina block and adjacent regions. The observed delay times of up to 1.5 s are large, indicating a mantle source for the anisotropy. Two distinct regimes of seismic anisotropy are revealed. The fast polarization directions in the northern Indochina block with a main trend of N100 degrees E are almost consistent with the direction of both the surface displacement and the absolute plate motion. These observations suggest the anisotropy is possibly generated by the present-day asthenospheric flow caused by the India-Eurasia collision. The fast polarization directions in the southern Indochina block and the Hainan island are nearly N60 degrees E. The anisotropy in this area may reflect a combination of the India-Eurasia collision and the past orogenies in the lithosphere, or an abrupt variation in the asthenospheric flow. (C) 2009 Elsevier B.V. All rights reserved. | |||||||||||||||
| 言語 | en | |||||||||||||||
| 書誌情報 |
en : PHYSICS OF THE EARTH AND PLANETARY INTERIORS 巻 176, 号 1-2, p. 33-43 |
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| 出版者 | ||||||||||||||||
| 言語 | en | |||||||||||||||
| 出版者 | ELSEVIER | |||||||||||||||
| ISSN | ||||||||||||||||
| 収録物識別子タイプ | EISSN | |||||||||||||||
| 収録物識別子 | 1872-7395 | |||||||||||||||
| DOI | ||||||||||||||||
| 関連識別子 | 10.1016/j.pepi.2009.03.008 | |||||||||||||||
