illuminating the cascadia subduction zone
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Searching for Faults From Afar
Researchers are using ocean-bottom and land-based seismometers to record the R/V Marcus Langseth’s soundings from afar, to better understand the potential impacts of large earthquakes in the Cascadia region.
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Collecting More Than Just Seismic Data Along the Cascadia Fault
While researchers search for a megathrust fault off the Pacific Northwest coast, they are also helping to map the seafloor in high resolution and detect underwater methane seeps.
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Looking Out for Marine Mammals
When using sound to search for an undersea fault, researchers must take special precautions to protect dolphins, whales and other vulnerable species.
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Seismic Data on Deck: Sounding for the Cascadia Megathrust Fault
Using sound and a 7.5-mile-long streamer towed behind the boat, scientists can collect a tremendous amount of data from under the seafloor.
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Observations While on Quarantine in Newport, Oregon
Before embarking on a 6-week voyage to scan for Cascadia’s megathrust fault, the research team had to quarantine for two weeks in a hotel.
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Searching for the Megathrust Fault at Cascadia
Researchers have set sail to find and map a fault that causes giant earthquakes in the Pacific Northwest.

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