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How water in the deep Earth triggers earthquakes and tsunamis

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Credit: Geological Society
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New tsunami risk identified in Indonesia

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Japan's risk of giant tsunamis may have grown when the angle of a down-going slab of ocean crust declined. Top: ocean crust (right) slides under continental crust at a steep angle, causing faulting (red lines) in seafloor sediments piled up behind. Bottom: as the angle shallows, stress is transferred to sediments piled onto the continental crust, and faults develop there. Blue dots indicate resulting earthquakes. At left in both images, the change in angle also shifts the region where magma fueling volcanoes is generated, pushing eruptions further inland. Credit: Adapted from Oryan and Buck, Nature Geoscience 2020
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Shifts in deep geologic structure may have magnified great 2011 Japan...

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Scientists used the model to calculate seismic risk in the L.A. Basin
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Source of Indonesian earthquakes and tsunamis located

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Anak Krakatoa eruption
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Tsunami unleashed by Anak Krakatoa eruption was at least 100m high

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The shallow water buoy can detect small movements and changes in the Earth's seafloor that are often a precursor to deadly natural hazards, like earthquakes, volcanoes and tsunamis. Credit: University of South Florida
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New technology developed to improve forecasting of Earthquakes, Tsunamis

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Klaus Reicherter from the University of Aachen examines a boulder that the tsunami carried onto the cliffs. Credit: Gösta Hoffmann/Uni Bonn
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Oman tsunami : Huge tsunami hit Oman 1,000 years ago

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Visualization of the modelled coupled earthquake and tsunami across Palu Bay, from Ulrich et al., 2019: Left: Seismic waves being generated while the earthquake propagates southward in a ‘superfast’ manner. Warm colours denote higher movements across the geological faults and higher ground shaking (snapshot after 15 seconds of earthquake simulation time). Right: The movements of the earthquake beneath the bathtub shaped Palu Bay generate a ‘surprise’ tsunami (snapshot of the water waves aftee 20s of simulation time of the tsunami scenario). Image credit: LMU.
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Role of earthquake motions in triggering a ‘surprise’ tsunami

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Ancient Tsunamis: Deducing the scale of tsunamis from the ’roundness’ of...

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The calving front of Bowdoin Glacier in northwestern Greenland, where icebergs are discharged and ice under the water melts.
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Tsunami signals to measure glacier calving in Greenland

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Image showing landslide failures around Orcas Island. The red line marks the newly discovered Skipjack fault zone. Credit: H. Gary Greene
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Salish seafloor mapping identifies earthquake and tsunami risks

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A recent study led by UMass Amherst looked at risk in southeast Japan after the devastating 2011 quake and tsunami.
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Modeling future earthquake and tsunami risk in southeast Japan

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An example of coastal boulder deposits on Inishmaan, Aran Islands. The cliffs are about 20 m high, and the boulders are piled 32-42 m inland from the cliff edge.
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Storm waves can move boulders we thought only tsunamis had the...

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The Cascadia Subduction Zone is capable of generating powerful earthquakes.
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Seafloor sediments appear to enhance Earthquake and Tsunami danger in Pacific...

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This is the cranium of a person who lived in what's now Papua New Guinea, 6,000 years ago.
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6,000-year-old skull could be from the world’s earliest known tsunami victim

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Risk of tsunamis in Mediterranean Sea has been overstated

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Geologists determine the breadth and depth of erosion from an ancient...

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High Tsunami Danger Under Alaska according to Seafloor Images

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Sea cave preserves 5,000-year snapshot of tsunamis

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Forgotten archives reveal street-level impact of 1918 Puerto Rico earthquake and...

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