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Selection of ground motion attenuation model for Peninsular Malaysia due to far-field Sumatra earthquakes

Author

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  • Tze Van
  • Tze Lau
  • Chai Mok

Abstract

Establishment of quality seismic hazard assessment is governed by capability of an attenuation model to produce closest predictions to the actual ground motion. Therefore, a robust ground motion attenuation model must be selected to feed a logic tree. The scarcity of historical strong ground motion data hinders the development of attenuation model for the low-seismicity area such as Peninsular Malaysia. This paper aims to determine an appropriate ground motion attenuation model for Peninsular Malaysia out of 28 pre-selected ground motion attenuation models. Evaluation of pre-selected models respective to actual weak ground motion records in Peninsular Malaysia resulted from Sumatra earthquakes was conducted. A total of 327 seismic records from 44 distant subduction and strike-slip Sumatra earthquakes with moment magnitude ranging from 5.2 to 9.1 spanning in a distance range of 284–1292 km were obtained from 19 seismic stations operated by Malaysian Meteorological Department. The multi-channel analysis of surface waves was conducted on all seismic stations to characterise the sites. Based on graphs plotting and calculation of quantification measure, the best fitting model for distant subduction earthquakes is Nabilah and Balendra ( 2012 ) with RMSE value as low as 0.182 and 0.107 for interface and intraslab events, respectively. Si and Midorikawa ( 2000 ) and Somerville et al. ( 2009 ) models give closest prediction to distant strike-slip earthquakes. Copyright Springer Science+Business Media Dordrecht 2016

Suggested Citation

  • Tze Van & Tze Lau & Chai Mok, 2016. "Selection of ground motion attenuation model for Peninsular Malaysia due to far-field Sumatra earthquakes," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 80(3), pages 1865-1889, February.
    • Handle: RePEc:spr:nathaz:v:80:y:2016:i:3:p:1865-1889
    DOI: 10.1007/s11069-015-2036-8
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