Saturday, January 23, 2021
Earthquake

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Seismogram
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Superheated rocks deep underground help explain earthquake patterns

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San Andreas Fault
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Deep underground forces explain quakes on San Andreas Fault

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Surface displacement mapped using InSAR satellite imaging data. Along the fault, the ground was either raised (southeast) or collapsed (northwest). The star designates the epicentre. Credit: Jean-François RITZ et al
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The Le Teil earthquake provides new insights on seismic risk in...

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seismogram
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Machine learning unearths signature of slow-slip quake origins in seismic data

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The Romanche fracture zone
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Rare ‘boomerang’ earthquake observed along Atlantic Ocean fault line

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Fracking
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What factors influence the likelihood of fracking-related seismicity in Oklahoma?

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268 seismometers (red) in 117 countries detected a drop on seismic noise. “Global quieting of high-frequency seismic noise due to COVID-19 pandemic lockdown measures” by Thomas Lecocq et al., published Thursday 23 July 2020 in Science Credits:Photo of seismometer: Stephen Hicks/Imperial College London
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COVID-19 lockdown caused 50 percent global reduction in human-linked Earth vibrations

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False color satellite image of the Taimali catchment area in southeastern Taiwan in August 2009 after typhoon Morakot. Red: vegetated surface, grey: barren surface (Image: LANDSAT-7 / NASA, JPL).
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Typhoon changed earthquake patterns

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How water in the deep Earth triggers earthquakes and tsunamis

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Illustration of the natural fluid injection process that triggered the Cahuilla swarm.
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Natural fluid injections triggered Cahuilla earthquake swarm

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Subduction zones occur where one tectonic plate dives under another. New computer modeling by Magali Billen, professor of earth and planetary sciences at UC Davis, shows why earthquakes on these sinking plates cluster at certain depths and could give insight into processes deep in the Earth. (U.S. Geological Survey)
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New clues to deep earthquake mystery

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New model to accurately date historic earthquakes

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Fault
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New study finds connection between fault roughness and the magnitude of...

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The ash plume from the Kilauea volcano on the big island of Hawaii was pictured May 12, 2018, from the International Space Station. Credit: NASA
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New NASA radar looks to monitor volcanoes and earthquakes from space

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A seismogram of 2011 Tōhoku earthquake and tsunami recorded at Weston Observatory in Massachusetts, USA. Credit: Image from Wikimedia Commons.
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Sediments may control location, magnitude of megaquakes

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The grey line in the rock, running from the foreground away under the boulder towards the mountains, is one of the shear zones from the study area. Credit: Lucy Campbell
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‘Fossil earthquakes’ offer new insight into seismic activity deep below Earth’s...

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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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The SHIRE project, which contributed resources to this research, is investigating seamounts within the Hikurangi Trench, to learn how they generate or dampen earthquakes at different stages of subduction. This seismic image shows a seamount known as Puke Seamount, colliding with New Zealand. Image: SHIRE/Andrew Gase.
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Sinking sea mountains make and muffle earthquakes

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Research suggest that rocks colliding inside fault zones, like this one in Maine, may contribute to damaging high-frequency earthquake vibrations. Credit: Julia Carr
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Researchers develop new explanation for destructive earthquake vibrations

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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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