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Verification of HVSR method at Minyak Beku outcrop bedrock in Johor, Peninsular Malaysia

Kamarudin, Ahmad Fahmy and Daud, Mohd Effendi and Ibrahim, Zainah and Ibrahim, Azmi (2015) Verification of HVSR method at Minyak Beku outcrop bedrock in Johor, Peninsular Malaysia. In: 2nd International Conference of Agriculture, Biotechnology, Science and Engineering, 28-29 August 2015, Ho Chi Minh City, Vietnam.

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QTS or Horizontal to Vertical Spectral Ratio [HVSR) method was introduced by Nakamura [I] to simple estimate the dynamic characteristics of surface ground such as natural frequency and amplification factor, .from microtremor to ground motion input motion. Application and implication of this technique were further discussed by various authors in many researches previously. In this study, ambient vibration or microtremor measurements have been carried out at Minyak Beku, Batu Pahat outcrop bedrock to evaluate the reliability of two assumptions consist in HVSR theory which are, the equivalence of horizontal and vertical spectral and unity HVSR ratio at a wide range on the base rock. The discussions of this paper comprise of microtremor fieldwork, definition of HVSR theory, processing procedure and validation of the finding against both assumptions used in HVSR method. Minyak Beku rock outcrop is vertically cut with approximate 20 meter height and 150 meter away from the sea line. Two seismometer sensors simultaneously placed on the bottom and top of the cliff for ten minutes of ambient vibration recordings. The recorded microtremor data were processed and analyzed into three components of North-South (NS), East-West (Ew and Vertical Fourier Amplitude Spectra (FAS) which then computed into HVSR ratio, by using free open-source software of GEOPSY developed by the SESAME group. Verification result made has successfully agreed to both assumptions of HVSR theory, although the sensors were separated at a distance. Perturbation of microseism effect from sea waves was clearly observed from the FAS and HVSR spectral curves.

Item Type: Conference or Workshop Item (Paper)
Subjects: G Geography. Anthropology. Recreation > GB Physical geography
Divisions: Faculty of Civil and Environmental Engineering > Department of Structural and Material Engineering
Depositing User: Normajihan Abd. Rahman
Date Deposited: 21 Sep 2015 08:34
Last Modified: 21 Sep 2015 08:34
URI: http://eprints.uthm.edu.my/id/eprint/7249
Statistic Details: View Download Statistic

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