• Modelling of strong motion generation areas for a great earthquake in central seismic gap region of Himalayas using the modified semi-empirical approach

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      https://www.ias.ac.in/article/fulltext/jess/128/04/0100

    • Keywords

       

      Central seismic gap; semi-empirical; SMGA; 1991 Uttarkashi earthquake.

    • Abstract

       

      Over the past decades, strong motion generation areas (SMGAs) have received significant attention in the modelling of high-frequency records. Herein, we propose the source model for a scenario earthquake ($M_{\rm{w}}$ 8.5) in the central seismic gap region of Himalayas. On the rupture plane, three SMGAs have been identified. Further, SMGA parameters are evaluated using available empirical relations. The spatiotemporal distribution of aftershocks is utilised to locate these SMGAs on the rupture plane. Further, the modified semi-empirical technique (MSET) is used to simulate the strong motion records. It has been observed that the study area can expect peak ground acceleration of >100 cm/s$^{2}$ and its distribution is mainly affected by the location of nucleation point in the rupture plane. Furthermore, the estimated peak ground acceleration (PGA) values are comparable with the earlier studies in the region. This confirms the robustness of generated rupture model with three SMGAs and the reliability of MSET to simulate high-frequency records.

    • Author Affiliations

       

      Sandeep 1 Joshi A2 Sah S K1 Parveen Kumar3 Sohan Lal2 Kamal 2

      1. Department of Geophysics, Banaras Hindu University, Varanasi, India.
      2. Department of Earth Sciences, Indian Institute of Technology Roorkee, Roorkee, India.
      3. Wadia Institute of Himalayan Geology, Dehradun, India.
    • Dates

       
  • Journal of Earth System Science | News

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