A new study reveals that an earthquake which has hypocentre 6000 kilometres apart can also have devastating effects on a place. Researchers stated that it can change stress endurance capacity and elastic properties to earth’s crust and these changes may last up to few weeks. Researchers also stated that the cause of any quake may be some other that just occurred at some other place.
Earth is a made up of tectonic plates that always keeps on moving slowly but measurably. If in any case these tectonic plates slides or strikes on any other than a big and series of earthquakes is observed. The tectonic plates are on the lithosphere, the outer and the only visible shell of the earth. There are seven major tectonic plates in mother earth namely, African plate, Antarctic plate, Eurasian plate, Indo-Australian plate, North American plate, Pacific plate and South American plate.
These researchers proved this in an article in the journal Science Advances, in which they stated that the 2012 quake in the coast of North Sumatra in The Indian Ocean, with 8.6 reading on Richter scale was followed by two earthquakes in Japan with a magnitude more than 5.5 on the same.
The research headed by Kevin Chao, a postdoc in Massachusetts Institute of Technology’s Department of Earth, Atmospheric and Planetary Sciences, who is also a member of a research team led by Andrew Delorey at Los Alamos National Laboratory. Chao stated that earthquakes are in the form of waves (known as ‘Seismic waves’) keep on moving to infinity with a decreasing amplitude, starting from the hypocentre. It’s just that the effect of these waves can be observed by a seismograph only up to 6000 kilometres. It takes almost 3 weeks for the earth to recover its elastic properties.
“When surface waves pass through, all of these properties rearrange and change. If a fault with high stress is ready to fail, it will accumulate more stresses in the fault, meaning an earthquake could occur at any time,” Chao said.