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接收函数CCP-PWS偏移方法探测中国东北地区620km深处低速层 被引量:10

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摘要 利用中国东北地区CCDSN台网4个台站和PASSCAL 19个台站的802条远震接收函数,以三维地壳上地幔速度模型为背景,用共转换点相位加权叠加(CCP-PWS)偏移技术,对研究区(120°~132°E,38°~48°N)上地幔间断面进行了成像.结果表明:在深度620km附近存在一个明显的低速层,而且在更靠近研究区西太平洋俯冲带东部较浅,深度约600km.经与前人研究结果对比,认为该低速层很可能是由西太平洋俯冲板块中的洋壳从俯冲板块分离并滞留堆积而形成.另外,受西太平洋俯冲板块的影响,660km间断面深度在研究区明显增大,最深达到700km,而且在其东北角明显呈现为多级间断面.
出处 《科学通报》 EI CAS CSCD 北大核心 2009年第2期215-223,共9页 Chinese Science Bulletin
基金 国家自然科学基金资助项目(批准号:40574024,40374009)
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