Study of earthquakes in Arunachal Himalaya reveals low to moderate earthquakes at depth 2 cortical | India Education, India Education News, Education News

Himalayan digging and growth is a continuous process that mostly results from inverse errors as the rocks move on the lower surface to a level of error under relatively fixed rocks on the upper surface, a process called peeling off the Indian plate under its Eurasian counterpart. This process continues to modify drainage patterns and ground shapes and is the pivotal cause of a tremendous seismic risk in the Himalayas belt and adjacent areas, which requires assessment and characterization of earthquakes in terms of cause, depth and intensity before the start of construction activities.

The Tuting-Tidding sewing area (TTSZ) is a major part of the eastern Himalayas, where the Himalayas take a steep curve south and connect to the Indo-Burma range. This part of the Arunachal Himalaya has gained great importance recently due to the increasing need for road construction and hydroelectric projects, which makes the need to understand the pattern of earthquakes in this region crucial.

A study by Wadia Institute of Himalayan Geology (WIHG), an independent institute for the Department of Science and Technology (DST), Government of India, explored the elastic properties of rocks and earthquakes in this eastern part of India that the region generates moderate earthquakes at two different depths. Low-volume earthquakes focus on a depth of 1-15 km, and earthquakes with a strength greater than 4.0 degrees are generated from a depth of 25-35 km. Medium depth is earthquake-free and coincides with the fluid / partial melting area.

The thickness of the earth’s crust ranges in this region from 46.7 km under the Brahmaputra Valley to about 55 km in the upper heights of Arunachal, with a marginal lift to the contact that defines the boundary between the crust and a mantle technically called moho.

This, in turn, reveals the flipping mechanism of the Indian plate in the Tuting-Tidding sewing area. A very high rate of Poisson was obtained in the upper parts of the Loch Valley, indicating liquid or partial melting in crustal depths. This detailed assessment of earthquakes in this area will help plan any large-scale construction in this area in the future.

The team of scientists led by Dr. Devajit Hazarika installed 11 broadband seismic stations along the valley of the Lohit River in Arunachal Himalaya to understand the elastic properties of rocks and earthquakes in this eastern part of India, a study published in the “ Journal of Asian Earth Sciences.

In the present study, the WIHG team used both seismic data (earthquakes occurring more than 1,000 km from the measurement site) and local seismic data with the help of seismometers that have a flat speed response to a frequency range of 0.004-35 Hz. Data was continuously recorded at 20 samples per second, and GPS receivers were used for time synchronization. The study that used seismic and local seismic data obtained from January 2007 to June 2008 helped to undermine mapping in this eastern part of the country and could not only help in building planning, but also improve earthquake preparedness in the region.

(Publication link:

https://doi.org/10.1016/j.jseaes.2019.104099)

the shape. Spatial distribution of earthquakes in and around the Tidding Suture Zone based on the earthquakes recorded by 11 broadband seismic stations (red triangles) during the period 2007-2008 and data obtained from the revised catalog from the International Seismic Center (ISC) for the period 1950-2016 ( http://www.isc.ac.uk). The depth distribution of earthquakes appears near the features of the study characterizing rectangular areas on both sides of the AB profile in (B). The main tectonic features identified in the profile are Mishmi Thrust (MT), Main Central Orientation (MCT), Tidding Thrust (TT), Lohit Thrust (LT), and Walong Thrust (WT).

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