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首页> 外文期刊>Journal of Asian earth sciences >Multiple source downwellings beneath eastern North China revealed by 3-D CCP migration of receiver function data
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Multiple source downwellings beneath eastern North China revealed by 3-D CCP migration of receiver function data

机译：通过接收器功能数据的3-D CCP偏移揭示了华北东部以下的多源下沉

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摘要

We collected and processed a total of 97,700 teleseismic receiver functions recorded by 580 broadband seismic stations from 686 earthquakes to study the mantle transition zone beneath eastern North China. We employed a recently developed 3-D P- and S-wave velocity model (the East Asia Radially Anisotropic Model, EARA2014) to compute Pds moveouts to migrate receiver function data. Amplitudes of the stacked P660s and P410s using the 3-D Pds moveout table are approximately 30% higher than those calculated from the I-D iasp91 model. The 3-D volume of CCP (common-conversion-point) stacked images that covers the area of 110-125 degrees E and 36-43 degrees N revealed two remarkable mantle transition zone anomalies with significant depression of the 660-km discontinuity. Together with other seismic observations, we speculated that these two anomalies are resulted from two different dynamic processes beneath eastern North China.
机译：我们收集并处理了686次地震中580个宽带地震台站记录的97,700个远程地震接收器功能，以研究华北东部以下的地幔过渡带。我们采用了最近开发的3-D P和S波速度模型（东亚径向各向异性模型，ERAA2014）来计算Pds偏移，以迁移接收器函数数据。使用3-D Pds偏移表的堆叠式P660和P410的幅度比从I-D iasp91模型计算得出的幅度高大约30％。覆盖110-125度E和36-43度N的CCP（公共转换点）堆叠图像的3-D体积显示了两个显着的地幔过渡带异常，并显着降低了660 km的不连续性。连同其他地震观测，我们推测这两个异常是由华北东部以下两个不同的动力过程引起的。

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  • 来源
    《Journal of Asian earth sciences》 |2020年第may1期|104266.1-104266.8|共8页
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    China Univ Petr State Key Lab Petr Resources & Prospecting Beijing 102249 Peoples R China|China Univ Petr Unconvent Petr Res Inst Beijing 102249 Peoples R China;

    China Univ Petr State Key Lab Petr Resources & Prospecting Beijing 102249 Peoples R China|China Univ Petr Unconvent Petr Res Inst Beijing 102249 Peoples R China|Rice Univ Dept Earth Environm & Planetary Sci Houston TX 77005 USA;

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  • 正文语种 eng
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  • 关键词

    Mantle discontinuities; Phase transition; Receiver function; North China; Delamination and Subduction;

    机译：地幔不连续;相变;接收器功能;华北分层和俯冲;

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