Saturday, April 20, 2019
Earthquake

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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
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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
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Massive Bolivian earthquake reveals mountains 660 kilometers below our feet

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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
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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
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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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Drilling deep for clues on earthquakes

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New computer modeling approach could improve understanding of megathrust earthquakes

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Map of the locations and depths of the deep low-frequency (DLF) earthquakes beneath the Laacher See Volcano ("Lake Laach Volcano") in Germany. Brittle earthquakes are marked as circles, DLF events as stars. Credit: Hensch et al.
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Deep low-frequency earthquakes indicate migration of magmatic fluids beneath Laacher See...

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A snapshot of seismic data taken at a single station during the peak of an aftershock sequence
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Q&A: Creating a “Virtual Seismologist”

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Transportable Array station P19K is one of the closest stations to the Iniskin earthquake origin. Solar panels power the station, and the seismometer is buried in a specially drilled borehole to insulate it from surface noise. Photo taken in 2017 during a service site visit by Incorporated Research Institutions for Seismology (IRIS). IRIS manages the Transportable Array station installation and maintenance. Credit: Doug Bloomquist, IRIS
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Alaska earthquakes offer new insight into improving hazard assessment

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Angelenos play below derricks at Huntington Beach pier, c. 1930-40. In the early decades of the twentieth century, LA residents accepted ground subsidence and small earthquakes as the cost of producing oil. But discontent began to rumble in the late 1930s. Rapid exploitation of Wilmington, one of the largest oil fields in California, and the Huntington Beach field caused Long Beach harbor to sink, buckling railway lines and forcing the city to build higher piers. Credit: Orange County Archives
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Oil extraction likely triggered mid-century earthquakes in L.A.

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Christopher DuRoss of the USGS updates maps of the trench walls while sitting on one of the benches excavated across the sackungen. Flags on the wall denote different layers of sediment the team identified that moved during past earthquake events. Credit: Ryan Gold.
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Punctuated earthquakes for New Madrid area: New research uncovers cluster of...

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Ed Garrett of Durham University examines bleached coralline algae related to the the 2016 magnitude 7.6 Chiloé earthquake in Chile. Credit: Martin Brader
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White line of algae deaths marks uplift in 2016 Chilean earthquake

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