Tuesday, June 18, 2019
Earthquake

Earthquake

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Earthquake mangled track
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Scientists take a ‘metamaterials’ approach to earthquake damage

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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
Earthquake

Salish seafloor mapping identifies earthquake and tsunami risks

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Seismic activity
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Scientists identify almost two million previously ‘hidden’ earthquakes

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Tibetan Plateau
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Folding faults and seismic risk in the Kunlun range, Northwest Tibet

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Everest
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Nepal expedition to remeasure height of Everest

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hydraulic fracturing for shale gas
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Damaging Sichuan earthquakes linked to fracking operations

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earthquake monitoring
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Crowdsourcing speeds up earthquake monitoring

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San Andreas Fault
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California’s current earthquake hiatus is an unlikely pause

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San Andreas Fault
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Signs of 1906 earthquake revealed in mapping of offshore northern San...

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Deep below the Earth in the Tonga-Fiji region of the South Pacific, one enormous earthquake triggered another.
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Massive earthquakes provide new insight into deep Earth

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The Washington coast is geologically complex.
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Hundreds of bubble streams link biology, seismology off Washington’s coast

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A map of Japan showing locations for the epicenter of the 2011 Tohoku earthquake (✩),Kamioka (K), Matsushiro (M) and seismic survey instruments used (△ and ●). Credit: 2019 Kimura Masaya
Earthquake

A new way to sense earthquakes could help improve early warning...

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Scientists used the model to calculate seismic risk in the L.A. Basin
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Fast, simple new assessment of earthquake hazard

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Roman monuments, including the Colosseum
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Seemingly dormant geologic fault damaged famous Roman buildings 1,500 years ago

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Graphic showing the Transition Zone inside the Earth Princeton seismologist Jessica Irving worked with then-graduate student Wenbo Wu and another collaborator to determine the roughness at the top and bottom of the transition zone, a layer within the mantle, using scattered earthquake waves. They found that the top of the transition zone, a layer located 410 kilometers down, is mostly smooth, but the base of the transition zone, 660 km down, in some places is much rougher than the global surface average. “In other words, stronger topography than the Rocky Mountains or the Appalachians is present at the 660-km boundary,” said Wu. NOTE: This graphic is not to scale. Credit: Kyle McKernan, Office of Communications
Earthquake

Massive Bolivian earthquake reveals mountains 660 kilometers below our feet

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Earthquake

Indonesia’s devastating 2018 earthquake was a rare supershear, UCLA study finds

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On the area map on the left, the colored background is the ground displacement induced by the Palu earthquake and the thin black line is the fault, both derived from satellite radar images. The black dot is the city of Palu. The circles are spots that radiated waves during the earthquake; their color indicates time (blue at the beginning, red at the end). The right figure shows the timing and position of these earthquake radiators. Their alignment indicates a steady earthquake speed of about 4.1 km/s Credit: © Han Bao et al., Nature Geoscience
Earthquake

Earthquake with magnitude 7.5 in Indonesia—an unusual and steady speed

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Floating seismometers dubbed MERMAIDs -- Mobile Earthquake Recording in Marine Areas by Independent Divers -- reveal that Galapagos volcanoes are fed by a mantle plume reaching 1,900 km deep. By letting their nine MERMAIDs float freely for two years, an international team of researchers created an artificial network of oceanic seismometers that could fill in one of the blank areas on the global geologic map, where otherwise no seismic information is available. Drifting a mile below the surface, MERMAIDs cover a large area. The red circles show where a MERMAID picked up a seismic signal. Credit: Courtesy of the researchers
Earthquake

MERMAIDs reveal secrets from below the ocean floor

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Where plates collide: The main frontal thrust (red line) extends over the entire length of the Himalayas. Credit: NASA Earth Observatory
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Waiting for the complete rupture

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Earthquake

Drilling deep for clues on earthquakes

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