Evidence of structural segmentation of the Uttarakhand Himalaya and its implications for earthquake hazard.

ABSTRACT: The earthquake hazard associated with the Main Himalayan Thrust (MHT) is a critical issue for India and its neighbouring countries in the north. We used data from a dense seismic network in Uttarakhand, India, to model the lateral variations in the depths of MHT (2-6% drop in V_s at 12-21 km depths), Moho (a sharp increase in V_s (by ~ 0.5-0.7 km/s) at 39-50 km depths) and lithosphere (a marked decrease in V_s(~ 1-3%) at 136-178 km depths), across the Himalayan collisional front. Our joint inversion of radial PRFs and group velocity dispersion data of Rayleigh waves detects three NNE trending transverse lithospheric blocks segmenting the lithosphere in Uttarakhand Himalaya, which spatially correlate well with the northward extension of the Delhi -Haridwar Indi

SUBMITTER: Mandal P 

PROVIDER: S-EPMC9902400 | biostudies-literature | 2023 Feb

REPOSITORIES: biostudies-literature