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Ground motion parameters for the 2015 Nepal Earthquake and its aftershocks

Author

Listed:
  • Jahnabi Basu

    (Indian Institute of Technology Madras)

  • Bhargavi Podili

    (Indian Institute of Technology Madras)

  • S. T. G. Raghukanth

    (Indian Institute of Technology Madras)

  • D. Srinagesh

    (CSIR - National Geophysical Research Institute)

Abstract

The 25th April 2015 Nepal earthquake was the first major event in the Himalayan orogeny to provide a relatively well-recorded dataset. This paper presents a comprehensive analysis of the mainshock and its five major aftershocks through 21 well-established ground motion parameters. The analysis is presented for near-field stations of the Kathmandu basin and far-field stations of the Indo-Ganga Plains, including the site response behavior with varying sediment depths. Moreover, Hilbert–Huang Transform is used to study site amplifications associated with sediment depth and soil class, especially at long periods. In addition, a new ground motion model (GMM) is derived for all 21 parameters using moment magnitude, source-to-site distance, site class and sediment depth as predictor variables. Further, to ensure that the developed GMM is not biased, an inter-event and intra-event residual analysis is performed. Furthermore, the GMM is compared with other well-established prediction models applicable to the study region. The efficacy of the current model is further addressed by the evaluation of ranking indices.

Suggested Citation

  • Jahnabi Basu & Bhargavi Podili & S. T. G. Raghukanth & D. Srinagesh, 2023. "Ground motion parameters for the 2015 Nepal Earthquake and its aftershocks," 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. 116(2), pages 2091-2134, March.
    • Handle: RePEc:spr:nathaz:v:116:y:2023:i:2:d:10.1007_s11069-022-05755-4
    DOI: 10.1007/s11069-022-05755-4
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    References listed on IDEAS

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    1. Karma Tempa & Raju Sarkar & Abhirup Dikshit & Biswajeet Pradhan & Armando Lucio Simonelli & Saroj Acharya & Abdullah M. Alamri, 2020. "Parametric Study of Local Site Response for Bedrock Ground Motion to Earthquake in Phuentsholing, Bhutan," Sustainability, MDPI, vol. 12(13), pages 1-22, June.
    2. A. Joshi & Ashvini Kumar & K. Mohan & B. Rastogi, 2013. "Hybrid attenuation model for estimation of peak ground accelerations in the Kutch region, India," 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. 68(2), pages 249-269, September.
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