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首页> 外文期刊>Seismological research letters >The Effects of Mississippi Embayment Sediments on Local Earthquake Tomography
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The Effects of Mississippi Embayment Sediments on Local Earthquake Tomography

机译：密西西比河沉积物对局部地震层析成像的影响

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摘要

The effects of velocity and thickness variations in chick, unconsolidated Mississippi Embayment sediments on local earthquake tomography for the New Madrid seismic zone must be understood before the tomography solutions can be interpreted in terms of deeper structure. Sediment effects are investigated using normal station corrections, synthetic modeling, and application of a sediment correction based upon independent knowledge of sediment thickness and velocity structure. Synthetic modeling indicates that smearing from strong velocity perturbations in the unconsolidated sediments can influence the uppermost, Paleozoic portion of the P-wave velocity solution and can extend into deeper portions of the S-wave velocity solution. However, there is little evidence for smearing due to velocity perturbations in the unconsolidated sediments in inversion results obtained using real arrival time data. The clustered distribution of hypocenters makes station corrections sensitive to velocity variations located deeper than the unconsolidated sediments; application of station corrections removes useful information from the portion of the inversion volume located below the unconsolidated sediments. The sediment correction also appears to remove information from the inversion solution but is an improvement for the P-wave solution over removal of station corrections. There is no evidence that the sediment correction is removing smearing effects produced by velocity perturbations in the unconsolidated sediments. The unconsolidated sediments do not appear to be exerting a first-order effect on local earthquake tomography solutions.
机译：在以更深的结构来解释层析成像解决方案之前，必须先了解雏鸡，未合并的密西西比河湾沉积物的速度和厚度变化对新马德里地震带当地地震层析成像的影响。根据对泥沙厚度和速度结构的独立了解，使用常规站校正，合成模型以及泥沙校正的应用来研究泥沙影响。综合模型表明，未固结沉积物中强烈的速度扰动会产生拖尾现象，这会影响P波速度解的最上部古生代部分，并且会扩展到S波速度解的更深部分。但是，在使用实际到达时间数据获得的反演结果中，几乎没有证据表明由于未固结沉积物中的速度扰动而产生拖尾现象。震源的聚集分布使台站校正对比未固结沉积物更深的速度变化敏感。台站校正的应用从位于未固结沉积物下方的反演体积部分中删除了有用的信息。泥沙校正似乎也可以从反演解中删除信息，但与消除站校正相比，P波解是一种改进。没有证据表明，沉积物校正可以消除未固结沉积物中速度扰动产生的拖尾效应。未固结的沉积物似乎对局部地震层析成像解决方案没有产生一级影响。

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