Northwest Pacific fundamental mode Rayleigh-wave group velocity and its relationship with tectonic structures

Om Prakash Mishra, Dapeng Zhao, Deo Datta Singh

研究成果: Article査読

10 被引用数 (Scopus)

抄録

The fundamental mode Rayleigh wave generated by 27 earthquakes and recorded at 11 digital broadband seismic stations belonging to the Ocean Hemisphere Project network in the northwest Pacific region are analyzed to estimate the Rayleigh- wave group velocity for 160 paths at periods from 10 to 50 sec. The inverted group velocity results suggest a quasi-continental oceanic transitional structure of the northwest Pacific Ocean with 21 km as an average crustal thickness. The Rayleigh- wave group velocity tomography results for short time periods (10-50 sec) showed a good correlation with known geological and tectonic features and were consistent with the tectonic complexities of the region. Slow-velocity anomalies at varying periods correspond to ridges, basins, trenches, and volcanic fronts of the northwest Pacific Ocean while the fast-velocity anomalies show the effects of plate interactions at relatively longer periods (30-50 sec). A triple junction formed by the subduction of the Phillipine Sea and Pacific plates beneath the Eurasian plate is imaged by a high-velocity zone in this study.

本文言語English
ページ(範囲)2125-2135
ページ数11
ジャーナルBulletin of the Seismological Society of America
95
6
DOI
出版ステータスPublished - 2005 12
外部発表はい

ASJC Scopus subject areas

  • 地球物理学
  • 地球化学および岩石学

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