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

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 use...

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Bibliographic Details
Published in:Iranian journal of science and technology. Transactions of civil engineering 2021-12, Vol.45 (4), p.2413-2424
Main Authors: Moghadasi, Naimeh Sadat, Shabani, Elham, Fotouhimehr, Mehrdad, Haghshenas, Ebrahim
Format: Article
Language:English
Subjects:
Arrays
Bedrock
Civil Engineering
Dispersion curve analysis
Earth models
Earth structure
Ellipticity
Engineering
Geophysics
Information processing
Noise
Process parameters
Research Paper
S waves
Signal processing
Subsoils
Underground structures
Velocity
Velocity distribution
Wave velocity
Wavelengths
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Summary: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.
ISSN:2228-6160
2364-1843
DOI:10.1007/s40996-020-00557-9