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Deep-Sea Drilling Uncovers Hidden Cause of Japan's 2011 Tsunami

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Deep-Sea Drilling Uncovers Hidden Cause of Japan's 2011 Tsunami

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The Gist

“A record-breaking ocean drilling project has identified a slippery layer of ancient clay as the primary factor behind the devastating scale of the 2011 Tōhoku earthquake.”

New scientific findings from record-breaking ocean drilling have shed light on the geological mechanics that made Japan’s 2011 earthquake and tsunami so catastrophic. By penetrating deeper into the seafloor than any previous expedition, researchers identified a critical structural weakness located beneath the Pacific Ocean.

The Role of Ancient Clay

The study reveals the presence of a thin, exceptionally slippery layer of ancient clay within the fault zone. This material acted as a lubricant, allowing the massive seismic rupture to propagate rapidly and unimpeded all the way to the ocean floor. This extreme movement displaced a massive volume of seawater, resulting in the powerful tsunami that devastated the Japanese coastline.

Advancing Seismic Understanding

This discovery provides a clear explanation for why the seafloor moved so violently during the event. Understanding the presence and distribution of these clay layers is essential for geologists to better assess the risks of future tsunamis in similar subduction zones around the world.

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