Toward Simultaneous Determination of Bulk Crustal Properties Using Virtual Deep Seismic Sounding

Toward Simultaneous Determination of Bulk Crustal Properties Using Virtual Deep Seismic Sounding
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使用虚拟深地震探测同时测定大块地壳特性

DOI:
10.1785/0120190294
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发表时间:
2020-03
影响因子:
3
通讯作者:
Wang-Ping Chen
Wang-Ping Chen
中科院分区:
地球科学3区
文献类型:
--
作者:
Qing Chen;Wang-Ping Chen

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本文在虚拟深地震测深(VDSS)方法的基础上,增加了跨莫霍面的SV-P转换SP相,以确定S波在地壳中的平均速度(VS)。VDSS使用了强烈的SV-P转换自由面以下的地震作为虚拟源的P波的广角反射。由虚拟源产生的大信号是VDSS的最强方面,其中不需要堆叠来建立信号。先前的工作使用广角反射的大时差,相位SsPmp,相对于直接S波到达,相位Ss,以最小化体P波速度(VP)和地壳厚度(H)之间的权衡。然后,它是直接使用的相位SP的时间来约束VS。作为例子,我们表明,这种方法适用于从临时和永久地震部署在对比构造环境中的数据。澳大利亚西部FORT站和西藏中部H1620站的VS分别为3.77±0.08和3.42±0.11 km/s。这一发展补充了仅使用来自S波列的信息来提取大块地壳的所有三个地震参数VP、VS和H的工作。这些参数对于限制地壳的二氧化硅总含量很重要。
We augment the method of virtual deep seismic sounding (VDSS) by adding the phases Sp, the SV-P conversion across the Moho, to determine the average speed of the S wave (VS) in the crust. VDSS uses the strong SV-P conversion below the free surface from teleseismic earthquakes as a virtual source for wide-angle reflections of the P wave. The large signal generated by the virtual source is the strongest aspect of VDSS in which no stacking is necessary to build up the signal. Previous work used the large moveout of the wide-angle reflection, phase SsPmp, relative to the direct S-wave arrival, phase Ss, to minimize the trade-off between bulk P-wave speed (VP) and thickness of the crust (H). It is then straightforward to use the timing of the phase Sp to constrain VS. As examples, we show that this method works for data from both temporary and permanent seismic deployments in contrasting tectonic settings. Specifically, VS under station FORT in western Australia and H1620 in central Tibet are 3.77±0.08 and 3.42±0.11  km/s, respectively. This development complements the undertaking of using information from only the S-wave train to extract all three seismic parameters of the bulk crust, VP, VS, and H. These parameters are important for constraining overall silica content of the crust.
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