Characterizing the shallow structure with the multimodal dispersion curves and the body wave refraction traveltimes from deep seismic sounding data
Characterizing the shallow structure with the multimodal dispersion curves and the body wave refraction traveltimes from deep seismic sounding data
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DOI：
10.3389/feart.2022.1025935
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发表时间：
2023-01
期刊：
影响因子：
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通讯作者：
Wenbin Guo;Zhengbo Li;Shuai Zhao;Xiaofei Chen
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文献类型：
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作者：
Wenbin Guo;Zhengbo Li;Shuai Zhao;Xiaofei Chen
深地震测深（DSS）剖面是探测地壳结构最有力的工具之一，在世界范围内得到了广泛的应用。通常，对DSS数据的分析主要集中在体波上，而表面波被认为是噪声。我们建议，在DSS数据的面波可以用来约束地下结构。在这项研究中，我们使用的DSS配置文件中的皮埃蒙特和大西洋沿岸平原作为一个例子来介绍DSS表面波的使用。利用频率-贝塞尔变换方法提取了多模态频散曲线，并将其与体波折射走时进行了Monte Carlo联合反演，以约束浅层结构。通过反演，在皮埃蒙特识别出地表水平地层，在大西洋沿岸平原识别出两层沉积构造。与现有研究的比较验证了本研究中获得的浅层结构的准确性，表明浅层速度结构可以很好地约束与多峰频散曲线提供的额外约束。因此，我们认为，进一步研究的面波记录在DSS调查是必要的。
Deep seismic sounding (DSS) profiles are one of the most powerful tools for detecting crustal structures, and they have been deployed worldwide. Generally, the analysis of DSS data mainly focuses on body waves, while the surface waves are considered noise. We suggest that the surface waves in DSS data can be used to constrain subsurface structures. In this study, we use a DSS profile in the Piedmont and Atlantic Coastal Plain as an example to present the usage of the DSS surface wave. Multimodal dispersion curves were extracted from the DSS data with the Frequency-Bessel transform method, and were used in Monte Carlo joint inversions with body wave refraction traveltimes to constrain the shallow structures. Through the inversion, a horizontal stratum on the surface was identified in the Piedmont, and a two-layer sedimentary structure was identified in the Atlantic Coastal Plain. Comparisons with existing studies verified the accuracy of the shallow structures obtained in this study, demonstrating that the shallow velocity structure could be well constrained with the additional constraints provided by the multimodal dispersion curves. Thus, we believe that further research on the surface waves recorded in DSS surveys is warranted.