Nayak, M and Sitharam, TG (2019) Estimation and spatial mapping of seismicity parameters in western Himalaya, central Himalaya and Indo-Gangetic plain. In: Journal of Earth System Science, 128 (3).
|
PDF
Jou_ear_sys_128-3_2019.pdf - Published Version Download (5MB) | Preview |
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 ∘ N and 72–91 ∘ 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 ∘ × 0.5 ∘ , 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.
| Item Type: | Journal Article |
|---|---|
| Publication: | Journal of Earth System Science |
| Publisher: | Springer |
| Additional Information: | The copyright for this article belongs to the Author(s). |
| Keywords: | earthquake catalogue; earthquake magnitude; estimation method; mapping method; return period; seismic hazard; seismicity; spatial variation, Gangetic Plain |
| Department/Centre: | Division of Mechanical Sciences > Civil Engineering |
| Date Deposited: | 31 Oct 2022 11:05 |
| Last Modified: | 31 Oct 2022 11:05 |
| URI: | https://eprints.iisc.ac.in/id/eprint/77697 |
Actions (login required)
 |
View Item |
