Left Menu
Development News Edition

Foreshocks, swarms caused recent earthquakes in India: Expert By Sudipto Chowdhury

Dr Sandip Som, the deputy director general of GSI, also said that foreshocks -- mild tremor preceding earthquakes -- or swarm activities -- series of earthquakes -- indicate release of tectonic stress and strain during the continuous deformation process, and a detailed study of these jolts could help predict if a significant seismic event is in store. "These minor earthquakes are mainly clustered in the north-eastern and north-western Himalayan region, around the Delhi-National Capital Territory (NCT), western Gujarat and Western Maharashtra areas which have been demarcated as seismic zones IV and V," the geologist told PTI on Sunday.

PTI | Kolkata | Updated: 04-10-2020 16:44 IST | Created: 04-10-2020 16:44 IST
Foreshocks, swarms caused recent earthquakes in India: Expert 	By Sudipto Chowdhury

The recent earthquakes in different parts of India, albeit of small magnitudes, have occurred due to foreshocks and swarms, a top official of the Geological Survey of India (GSI) said, warning that frequent tremors were a matter of concern in the subcontinent, where several areas are prone to major seismic activities. Dr Sandip Som, the deputy director general of GSI, also said that foreshocks -- mild tremor preceding earthquakes -- or swarm activities -- series of earthquakes -- indicate release of tectonic stress and strain during the continuous deformation process, and a detailed study of these jolts could help predict if a significant seismic event is in store.

"These minor earthquakes are mainly clustered in the north-eastern and north-western Himalayan region, around the Delhi-National Capital Territory (NCT), western Gujarat and Western Maharashtra areas which have been demarcated as seismic zones IV and V," the geologist told PTI on Sunday. In the past, too, low-magnitude earthquakes have been recorded in these regions, he said.

According to the GSI scientist, earthquakes in the north-eastern and north-western Himalayas occur along the plate convergence zones -- between India and Eurasia. "In the Delhi-NCT region, the spatial distribution of seismicity shows seismic activity-concentration mainly in three places -- west of Delhi (near Sonipat), along the Mahendragarh-Dehradun subsurface fault and Delhi Subsurface Ridge," he said.

"Similarly, in Western Gujarat, the seismic concentration is located near the intersection between Rajkot-Lathi lineament and neo-tectonic Kutch mainland fault. There is an east-west flexure of Indian lithosphere in the Western Ghat Escarpment," Dr Som said.

Explaining the reason behind the frequent tremors, the geologist said any earthquake depends on the strain and stress build-up of an area. "Main strain and stress build-up areas have been noted along the convergence zone between Indian and Eurasian plates.

Due to continuous plate movement, stresses build up in this area. Moreover, there are around 30 water reservoirs along the WGE. Enhanced water load in the reservoirs increases pore pressure and stress, triggering earthquakes," he said. Incidentally, the GSI has deployed 30 permanent GPS stations across the country to monitor tectonic plate movements and develop a strain map to identify potential hazardous zones.

"Work is under progress and likely to be completed its first phase very soon. We will also carry out seismic microzonation (process of sub division of region) and active fault studies to evaluate potential geological vulnerable seismic sites," he said..


TRENDING

OPINION / BLOG / INTERVIEW

Turbulence surrounding tobacco control in Ghana

... ...

Smart healthcare: IoT redefining the way healthcare is delivered

As the world is embracing the new wave of digitalization triggered by the pandemic and the arrival of 5G, the adoption of IoT devices will further boom. With adoption set to soar, IoT security issues and other challenges cant be ignored any...

Refugee compassion and response: Ideas to mitigate disasters now and in their future

Their homeland becomes a forbidden territory for them and more likely than not, their journey to foreign soil is no less traumatizing, not to say deadly. It is crucial to help refugees live a life of dignity and purpose....

Inadequate water infrastructure causes a tidal wave of coronavirus in rural Alaska

... ...

Videos

Latest News

China announces eradication of extreme poverty in last poor counties

China has removed the last remaining counties from a list of poor regions, in what officials described as achieving President Xi Jinpings longstanding political goal of eliminating extreme poverty by the end of this year. The milestone was ...

TRS promises 20k litres free water for Hyderabad residents, BJP terms manifesto as 'recycled document'

Chief Minister of Telangana Kalvakuntla Chandrashekar Rao yesterday released the Telangana Rashtra Samithi TRS manifesto for the upcoming Greater Hyderabad Municipal Corporation GHMC elections scheduled to be held on December 1, where the p...

Thanksgiving could be make-or-break in US virus response

In Pennsylvania, if youre having friends over to socialize, youre supposed to wear a mask and so are your friends. Thats the rule, but Barb Chestnut has no intention of following it. No one is going to tell me what I can or not do in my ow...

WBBL: Sophie Devine named 'Player of the Tournament'

Perth Scorchers all-rounder and captain Sophie Devine was on Tuesday named Player of the Womens Big Bash League WBBL 2020. Emerging Adelaide Strikers fast-bowler Darcie Brown was named the Young Gun for WBBL06.In her first season with the S...

Give Feedback