| 东北地区660km间断面附近波速结构研究 |
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| 引用本文： | 叶玲玲,李娟.东北地区660km间断面附近波速结构研究[J].地震学报,2012,34(2):137-146. |
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| 作者姓名： | 叶玲玲 李娟 |
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| 作者单位： | 1) 中国北京100029中国科学院地球深部重点实验室，中国科学院地质与地球物理研究所2) 中国北京100049中国科学院研究生院 |
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| 基金项目： | 国家自然科学基金项目(41074034,40774042和90714012)资助 |
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| 摘 要： | 我国东北地区位于西北太平洋和达-贝尼奥夫俯冲带前缘,其深部速度结构对理解板块俯冲行为以及地幔物质的交换有重要意义.利用区域三重震相模拟方法,对中国地震观测台网记录到的两个深源地震P波和SH波波形数据,进行了相对到时和波形的拟合,获得了我国东北地区660 km间断面附近波速结构.结果表明,研究区域下方的间断面没有发生明显...
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| 关 键 词： | 三重震相 660 km间断面 俯冲板块 S波低速异常 东北地区 |
Detecting velocity structure around 660-km discontinuity beneath Northeastern China |
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| Ye Lingling
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Li Juan.Detecting velocity structure around 660-km discontinuity beneath Northeastern China[J].Acta Seismologica Sinica,2012,34(2):137-146. |
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| Authors: | Ye Lingling Li Juan |
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| Affiliation: | 1) Key Laboratory of the Earth's Deep Interior, Institute of Geology and Geophysics,Chinese Academy of Sciences, Beijing 100029, China2) Graduate University, Chinese Academy of Sciences，Beijing 100049, China |
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| Abstract: | Located at the front edge of the Wadati-Benioff zone of subducted northwestern Pacific plate,the velocity structure in the mantle transition zone beneath Northeastern China plays an important role in constraining the behavior of subducted slabs and material or energy exchange in mantle.By modeling P and SH triplicate waveforms from two deep events,recorded by a dense regional network stations,we show that a layer of fast anomaly,about 130 km thick,lies above the 660-km discontinuity with slight depression,which may be associated with the westward extension of the stagnant Pacific slab.The mantle transition zone,as a whole,is featured by low shear wave velocity and high vP/vS ratio,which may indicate the existence of a water-bearing mantle transition zone. |
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| Keywords: | triplication 660-km discontinuity subducted slab low shear velocity anomaly Northeastern China |
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