Friday, December 3

Scientists detect the deepest earthquake in history | Digital Trends Spanish

Earthquakes are classified into three groups, based on their depth: shallow, intermediate, and deep. The deep ones are those in whose origin (or hypocenter) is more than 300 kilometers -186 miles- deep and in that category the deepest earthquake detected in history is framed.

The discovery was carried out by a group of scientists from the University of Arizona and indicates the earthquake in question was an aftershock of a 7.9-magnitude earthquake that occurred in 2015 near the Bonin Islands, located 1,000 kilometers (or 621 miles) south of Japan.

But this aftershock was not felt on the surface. The scientists found it using Japan’s earthquake detection system, one of the most advanced in the world, and the 4D images obtained revealed that the hypocenter of the earthquake occurred in the lower mantle of the Earth, which in theory begins at 660 kilometers ( 410 miles) deep.

Getty Images

However, this discovery raises some doubts about the inner limits of the planet, suggesting that they are perhaps more diffuse than previously believed. According to the researcher Heidi houston, which was not involved in the original study, the Bonin Islands are “a complicated place” because it is not known exactly where the lower mantle begins and where the upper mantle ends.

And to the above is added the fact that, at such depths, the minerals in the interior have a strange behavior and different from that expected at a lower depth. Therefore, the origin of earthquakes in the lower mantle of the Earth would be given by factors that until now were believed, at least from theory, impossible to happen.

However, the original study (whose authors are Eric Kiser, Haiyang kehoe, Min Chen and Amanda Hughes) has to be validated by other scientists. However, researchers consulted by Live Science believe that the methodology used is correct, as are the results obtained.

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