Estimation of very large seismic events from non-homogeneity of Himalayas

New Delhi: Scientists have found that the Himalayas are not homogeneous and they speculate that different directions have different physical and mechanical properties. A property present in crystals is called anisotropy that results in significantly larger seismic events in the Himalayas. Can come.

The North Western region of India, covering Garhwal and Himachal Pradesh, has experienced four destructive earthquakes ranging from medium to large since the early 20th century – the 1905 earthquake in Kangra, the Kinnaur earthquake of 1975, the Uttarkashi earthquake of 1991 and the 1999 Earthquake in Chamoli. These seismic activities reflect large-scale subsurface deformation and weak zones and underscore the need to delve into the present-day deformation below these unstable zones in terms of structure.

Researchers at the Wadia Institute of Himalayan Geology (WIHG) and Indian Institute of Technology Kharagpur (IIT KGP), Dehradun, an autonomous institute under the Department of Science and Technology, Government of India, named Dr. Sushil Kumar, Scientist ‘G’, WIHG; Shubhasmita Biswal, Researcher, WIHG and IIT KGP; William Mohanty, Professor IIT KGP and Mahesh Prasad Parija, former researcher, WIHG, used the WIHG data to demonstrate that the northwestern Himalayan regions exhibit a characteristic feature present in the crystal.

A joint study using seismic waves of 167 earthquakes recorded by 20 broadband seismic centers stationed in the Western Himalayas indicated that the major contribution of anisotropy is mainly due to the Indo-Eurasia collision (which has continued for 50 million years ) Deformation caused by induced pressure and collision is found to be larger in the crust than in the upper cover. It has recently been published in the ‘Lithosphere (GSA)’ journal in 2020.

Inhomogeneity along the Himalayas affects the pressure rate due to changes in the geometry of the Maine Himalayan thrust (MHT) system and it controls the rupture (rupture) size during an earthquake. This lack of similarity in physical and mechanical properties of the Himalayas may help in discovering new possibilities regarding the deformations occurring in the Himalayan-Tibet crustal belt involved in the construction of the Himalayan mountains.

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