Mid-lithosphere discontinuities beneath the western and central North China Craton
Mid-lithosphere discontinuities beneath the western and central North China Craton
复制标题
华北克拉通西部和中部的中岩石圈间断层
DOI：
10.1002/2016gl071840
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发表时间：
2017
影响因子：
5.2
通讯作者：
Kennett B. L. N.
中科院分区：
文献类型：
--
作者：
Sun Weijia;Kennett B. L. N.
通过对密集地震剖面上远震事件叠加自相关图提取的预反射率进行分析，获得了华北克拉通（NCC）西部和中部的中岩石圈不连续层（MLD）的详细图像。这种地震日光成像利用宽高频带（0.5 - 4hz）来揭示多尺度岩石圈非均质性的细尺度成分。NCC西部和中部的MLD深度在80 ~ 120 km之间，与Rayleigh波层析成像的负速度梯度过渡与深度吻合较好。从地震日光成像推断的MLD也与从热流数据估计的从传导到对流的转变有很好的对应关系，这表明地震岩石圈内可能存在热控制。
By analyzingPreflectivity extracted from stacked autocorrelograms for teleseismic events on a dense seismic profile, we obtain a detailed image of the mid‐lithosphere discontinuity (MLD) beneath western and central North China Craton (NCC). This seismic daylight imaging exploits a broad high‐frequency band (0.5–4 Hz) to reveal the fine‐scale component of multi‐scale lithospheric heterogeneity. The depth of the MLD beneath the western and central parts of the NCC ranges 80–120 km, with a good match to the transition to negativeSvelocity gradient with depth from Rayleigh wave tomography. The MLD inferred from seismic daylight imaging also has good correspondence with the transition from conductive to convective regimes estimated from heat flow data indicating likely thermal control within the seismological lithosphere.