Single station ambient noise measurement in campaign mode has of late gained a huge popularity among geo-scientists. Herein, we present results of ambient vibration analysis, executed in a highly populated urban area covering 47 survey points. The resonance frequency estimates range from 0.5 to 3 Hz, as found from H/V. Taking H/V curve as input for retrieving subsurface information, we deploy diffuse field assumption (DFA) theory. The obtained shear wave velocity from the inversion of H/V curve through DFA approach provides evidence of the complex nature of the subsurface geological structures. Identifying six characteristic 2D cross-sections of the entire area, we attain prevalence of a low-velocity intermediate layer with velocity ranging from 128–192 m/s. On the contrary, a relatively high-velocity layer is also obtained (279–471 m/s) which can be treated as sedimentary deposits (may be for some sites as basin basement). The attained results, when extended to a 3D shear wave profile, tally excellently with estimated frequency distribution and its corresponding links with depth wise strata, accompanied by a topographical profile of the surveyed locations. All findings are comprehensively analyzed and interpreted as a proof of concept of implementation of DFA approach towards retrieving subsurface information.

中文翻译：

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利用地震环境噪声基于扩散场理论概念的城市地下结构成像

运动模式下的单站环境噪声测量最近在地球科学家中广受欢迎。在此，我们展示了在人口稠密的城市地区执行的环境振动分析结果，涵盖了 47 个调查点。共振频率估计范围从 0.5 到 3 Hz，如从 H/V 中发现的。以 H/V 曲线作为检索地下信息的输入，我们部署了漫射场假设 (DFA) 理论。通过 DFA 方法从 H/V 曲线反演获得的横波速度提供了地下地质结构复杂性质的证据。识别整个区域的六个特征二维横截面，我们获得了速度范围为 128-192 m/s 的低速中间层的普遍存在。相反，还获得了一个相对高速的层（279-471 m/s），可以作为沉积物处理（​​对于某些地点可能作为盆地基底）。所获得的结果，当扩展到 3D 横波剖面时，与估计的频率分布及其与深度方向地层的相应联系非常吻合，并附有调查位置的地形剖面。所有发现都经过全面分析和解释，作为实施 DFA 方法检索地下信息的概念证明。附有调查地点的地形剖面图。所有发现都经过全面分析和解释，作为实施 DFA 方法检索地下信息的概念证明。附有调查地点的地形剖面图。所有发现都经过全面分析和解释，作为实施 DFA 方法检索地下信息的概念证明。