Analysis of RayDec Parameters in Extracting Ellipticity Curve to Retrieve Shear Wave Velocity Profile: A Case Study in the South of Tehran

Springer Science and Business Media LLC - Tập 45 - Trang 2413-2424 - 2021
Naimeh Sadat Moghadasi1, Elham Shabani1, Mehrdad Fotouhimehr1, Ebrahim Haghshenas2
1Department of Seismology, Institute of Geophysics, University of Tehran, Tehran, Iran
2International Institute of Earthquake Engineering and Seismology, Tehran, Iran

Tóm tắt

Seismic ambient noise is nowadays widely used in geophysics to characterize the subsoil structure. They are convenient, practical, and low-cost tool to provide reliable information about the underground structure especially in urbanized area. In this paper, seismic ambient noise measurements are used to study the subsoil properties at a site in the south of Tehran. Single station RayDec (Random Decrement method) and three-component F–K (frequency–wavenumber) array methods are considered. RayDec is scrutinized more precisely through applying different signal processing parameters. In this regard, a set of synthetic seismic ambient noise is produced for a 1-D earth structure very similar to what already is known in the south of Tehran, near to the place of seismic ambient noise measurements in an array of stations. The effects of applying different filters and triggering conditions on ellipticity curves are studied. Then, resultant ellipticity curves are compared to the theoretical curve obtained from known earth model to find the suitable parameters. The resultant ellipticity curve plus the dispersion curve obtained from F–K are used as targets in the inversion process. The shear wave velocity and the depth of bedrock at the site in the south of Tehran are estimated about 2200 ± 200 m/s and 700 ± 70 m, respectively. They show agreement with geological evidences and also the previous studies in this site.

Tài liệu tham khảo

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