Estimation of Site Dynamic Characteristics from Ambient Noise Measurements Using HVSR Method in Microzonation Study: Senggarang, Batu Pahat, Malaysia

Abstract:

Site dynamic characteristics evaluation of fundamental ground frequency, F_o and amplification factor, A_o in Senggarang region were presented in 2D and 3D contour maps (microzonation maps) based on the ambient noise measurements carried out using Lennartz 1 Hz tri-axial seismometer sensors. Reliability of F_o and A_o determined from the ambient noise technique has become the main key components in seismic hazard analysis, resonance effect assessment, predictions of sedimentary layer and shear wave velocity, through cheaper, non-destructive and quick methodology. 73 points of ambient noise records were analyzed using Horizontal-to-Vertical Spectral Ratio (HVSR) method in the boundary area of 800 m x 800 m with the grid spacing of 100 m x 100 m. Significant peaks of mean HVSR curves were checked against the criterions proposed by the SESAME guideline. Slight difference of the F_o contours pattern between the North-South (NS) and the East-West (EW) directions was observed, but vice versa to the A_o contours between both directions. Significant peaks of F_o values were distributed from 1.61 to 6.35 Hz, whereas the A_o values were found from 3.18 to 9.39. Wide gap between the ranges of F_o and A_o in respective direction have shown to the variation of sediment thicknesses. Meanwhile, dominance shape of significant peak from the HVSR curves may indicate to a large velocity contrast presence underneath the ground surfaces.

• Periodical: Advanced Materials Research (Volumes 931-932)
• Pages: 803-807
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.931-932.803
• Online since: May 2014
• Authors: Ahmad Fahmy Kamarudin*, Mohd Effendi Daud, Zainah Ibrahim, Ibrahim Azmi, Mohamad Khairani Yub, Mohd Alias Mohd Noor
• Keywords: Ambient Noise, Dynamic Characteristic, HVSR, Microzonation Map

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