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Seismic waves bounced off Earth’s core and shifted Japan after massive 2011 earthquake
When massive 9.0 magnitude earthquake shook Japan on March 11, 2011, the ground also made a more lasting move. About 15 minutes after the event began at 2:46 p.m. local time, nearly the entire country shifted eastward, according to GPS station measurements.
The lurch was small â 5 to 6 millimeters, or 0.20 to 0.24 inches â but permanent and at the time went largely unnoticed or was passed off as a data glitch. However, University of Chicago geophysicist Sunyoung Park felt the recorded signals that indicated a shift pointed to something tangible. In fact, the ground movement reflected an âextraordinaryâ and previously undocumented seismic phenomenon, according to a new study.
An earthquake hit Japan so hard it made the entire country move
Japan’s 2011 earthquake was so powerful that it shifted the entire country’s location
This “extraordinary” event was likely caused by seismic waves bouncing off Earth’s core, researchers found
Japan’s catastrophic Tohoku-Oki earthquake in 2011 was so strong that it caused the entire country to “slip,” in some areas by as much as five or six millimeters, according to new research.
This “extraordinary observation,” as it is described in a new study published today in Science, was likely triggered by seismic waves bouncing off Earth’s core in the wake of the magnitude 9.0 quake. This never-before-seen event could present a previously unknown hazard associated with earthquakes, says Sunyoung Park, the study’s lead author and an assistant professor of geophysics at the University of Chicago.
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A 2011 earthquake bounced a seismic wave off Earth’s core, nudging Japan east
The deep-diving wave set off the first fault slip ever tied to such an event
An earthquake that struck Japan on March 11, 2011, caused widespread devastation. It also triggered a seismic wave that bounced off Earth’s core and moved the whole country a few millimeters east.
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Not long after a powerful earthquake rocked Japan, the whole country moved a few millimeters east. The cause, researchers report June 18 in Science, was a seismic wave that plunged to Earth’s core and back, causing faults to slip — the first recorded case of a core-reflected wave setting a fault in motion.
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