The powerful earthquake shook all of Japan.

When the devastating 9-magnitude earthquake shook Japan on March 11, 2011, the ground in the country also shifted.

The 2011 earthquake in Japan triggered a tsunami that struck the coastal city of Miyako in the north of the country.

Photo: AFP

Approximately 15 minutes after the earthquake began at 2:26 p.m. on March 11, 2011 (local time), almost all of Japan's landmass shifted eastward, according to CNN, citing GPS data.

This shift was insignificant, only about 5-6 mm, but it was permanent and at the time went largely unnoticed as it was considered a data error.

However, geophysicist Sunyoung Park of the University of Chicago (USA) felt that the recorded signals reflected something real. And according to a new study published by Park's team, this movement reflects an "extraordinary" seismic phenomenon that has never been recorded before.

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"What's unusual about this movement is that the entire territory of Japan shifted almost simultaneously," reporting team leader Park pointed out.

She said the movement affected the entire mainland of Japan, stretching 3,000 km from Hokkaido to Kyushu, and did not coincide with the main earthquake and preceded strong aftershocks.

After years of analyzing GPS and seismic data, Park's team discovered that seismic waves from the earthquake had traveled down to the Earth's core and bounced back into the crust, causing four major tectonic plates to shift.

While seismologists know that waves from large earthquakes can travel through the Earth and bounce back to its outer core, which is made of liquid metal, they believe that the energy dissipates along the way before returning to the Earth's crust.

"A type of deep-penetrating wave that triggers certain types of seismic phenomena like this is completely new, and this event is extremely unusual, on an extremely large scale," Park explained.

Earthquakes can cause powerful geological shifts, such as tearing the ground apart with large fissures or shifting large areas by tens of centimeters.

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However, these effects typically occur locally and do not affect almost the entire country, as Park and her research team discovered.

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Source: https://thanhnien.vn/tran-dong-dat-manh-dich-chuyen-ca-nhat-ban-185260625143710009.htm