• Estimation and spatial mapping of seismicity parameters in western Himalaya, central Himalaya and Indo-Gangetic plain

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    • Keywords


      Himalayan region; Indo-Gangetic plain; seismicity parameters; maximum likelihood estimation; return period.

    • Abstract


      The present study attempts to assess the seismic hazard parameters (a, b and $M_{c}$) and their spatial variation in western Himalaya, central Himalaya and Indo-Gangetic plain areas (19–38$^{\circ }$N and 72–91$^{\circ }$E). The earthquake catalogue is prepared from different available sources, within a region of 500 km surrounding the study area, in moment magnitude scale. The maximum likelihood estimation method is used for spatial variation of seismicity parameters. The study area is disaggregated into small grids of 0.5$^{\circ }$ $\times$ 0.5$^{\circ }$, and the spatial variation of seismicity parameters is analysed for the complete catalogue period. A significant variation in seismicity parameters is observed while moving from west to east along the Himalayan belt within the study area. Due to significant variations in seismicity parameters, instead of assigning a lumped value of seismic hazard parameter to the entire region, distributed seismic hazard parameter is assigned by dividing the entire area into five zones, of similar level of seismicity. The estimated seismicity parameter a for these zones varies from 4.28 to 6.18, and for b, it varies from 0.80 to 1.03. Using these Gutenberg–Richter parameters a and b, the present study estimated the return periods and probability of different magnitudes of earthquake for each zone.

    • Author Affiliations


      Monalisha Nayak1 Sitharam T G1

      1. Department of Civil Engineering, Indian Institute of Science, Bengaluru 560 012, India.
    • Dates

  • Journal of Earth System Science | News

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      Posted on July 25, 2019

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