After the 2004 tsunami, Andaman became unusually ‘unstable’

After the 2004 tsunami, Andaman became unusually ‘unstable’

A 10-minute-long earthquake is quite unusual. Many prefer it even more, in quick succession. But under the Andaman Sea near Nicobar, the 2004 earthquake and tsunami set a series of intermittent earthquake tremors that also indicate volcanic activity.
Scientists at CSIR-National Institute of Oceanography in Goa on the research ship RV Indus Sankalp experimented a passive ocean floor seismometer in Indian waters for the first time.
They found 141 high-frequency earthquakes and swings (quake bursts with some time lag, from hours to days) in areas where three faults – varieties of the Andaman Nicobar Fault, West Andaman Fault and Great Sumatra Fault – meet. Huh .
In January 2005, March 2014, October 2014, November 2015 and March 2019 – there were major clashes in the Nicobar region in the Andaman Sea over five different periods. His study was published in the Nature Scientific Report this month.
They were really tall. “The March 2014 herd, for example, had lasted 48 hours,” lead author Ashwini KK told TOI. In January 2005 the herd was by far the strongest record globally. Some of the 2014 earthquakes had long-term signs, such as the 600-second signal. “It is rare and suggests that the origin of seismic waves is deep-seated, located at a depth in the subsurface, which is about 30 km below sea level,” said the same author, Kamesh Raju. “At that depth, we expect magma at work.”
So the “tsunamogenic megathrust earthquake” in December 2004 was itself a cause, with active volcanoes in the area also causing some changes.
Does this mean that an explosion can occur in an explosion? “Studies on the submarine volcanic chain that extend from the barren island in the north to the coastal volcanoes of Sumatra will provide insight to answer the above question,” Raju said.

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