利用密集地震阵列记录的环境噪声成像城市隐藏断层

IF 2.6 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Seismological Research Letters Pub Date : 2024-07-01 DOI:10.1785/0220230408

Ettore Biondi, Jorge C. Castellanos, Robert W. Clayton

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引用次数: 0

摘要

识别已存在的近地表断层是正确评估任何地区地震危险所需的关键信息。在人口稠密和城市化严重的地区，绘制这些结构的地图尤其具有挑战性。我们利用加利福尼亚州海豹滩密集阵列记录的环境地震噪声，通过反射面波分析对浅层断层线进行成像。我们的研究结果凸显了以前未知的浅层断层的存在，这些断层与浅层地震和活动勘测图像的相关性非常好。

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Imaging Urban Hidden Faults with Ambient Noise Recorded by Dense Seismic Arrays

The identification of preexisting near‐surface faults represents a piece of crucial information needed to correctly assess the seismic hazard of any area. The mapping of these structures is particularly challenging in densely populated and heavily urbanized areas. We use ambient seismic noise recorded by a dense array in Seal Beach, California, to image shallow fault lines via a reflected surface‐wave analysis. Our results highlight the presence of previously unknown shallow faults that correlate remarkably well with shallow seismicity and active survey images.

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