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  October 15, 2021

  U.S. West Coast and Alaska Marine Geohazards

  Marine geohazards are sudden and extreme events beneath the ocean that threaten coastal populations. Such underwater hazards include earthquakes, volcanic eruptions, landslides, and tsunamis.

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  Natural Hazards, Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center, 3-D CT Core Imaging Laboratory, Core Preparation and Analysis Laboratory and Sample Repositories

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  October 15, 2021

  U.S. West Coast and Alaska Marine Geohazards

  Marine geohazards are sudden and extreme events beneath the ocean that threaten coastal populations. Such underwater hazards include earthquakes, volcanic eruptions, landslides, and tsunamis.

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• Data
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  December 28, 2017

  Multichannel sparker seismic-reflection data of field activity 2016-656-FA; between Icy Point and Dixon Entrance, Gulf of Alaska from 2016-08-07 to 2016-08-26

  This data release contains high-resolution multichannel seismic (MCS) reflection data collected in August of 2016 along the southeast Alaska continental margin. Structure perpendicular MCS profiles were collected along the Queen Charlotte-Fairweather fault. The data were collected aboard the R/V Norseman using a Delta sparker sound source and recorded on a 64-channel digital streamer. Subbottom ac

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  Natural Hazards, Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center
• Publications
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  May 1, 2018

  Deformation of the Pacific/North America plate boundary at Queen Charlotte Fault: The possible role of rheology

  The Pacific/North America (PA/NA) plate boundary between Vancouver Island and Alaska is similar to the PA/NA boundary in California in its kinematic history and the rate and azimuth of current relative motion, yet their deformation styles are distinct. The California plate boundary shows a broad zone of parallel strike slip and thrust faults and folds, whereas the 49‐mm/yr PA/NA relative plate mot

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  Woods Hole Coastal and Marine Science Center

  January 1, 2018

  Strain partitioning in southeastern Alaska: Is the Chatham Strait Fault active?

  A 1200 km-long transform plate boundary passes through southeastern Alaska and northwestern British Columbia and represents one of the most seismically active, but poorly understood continental margins of North America. Although most of the plate motion is accommodated by the right-lateral Queen Charlotte–Fairweather Fault (QCFF) System, which has produced at least six M > 7 earthquakes since 1920

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  Pacific Coastal and Marine Science Center

  June 19, 2017

  Reducing risk where tectonic plates collide

  Most of the world’s earthquakes, tsunamis, landslides, and volcanic eruptions are caused by the continuous motions of the many tectonic plates that make up the Earth’s outer shell. The most powerful of these natural hazards occur in subduction zones, where two plates collide and one is thrust beneath another. The U.S. Geological Survey’s (USGS) “Reducing Risk Where Tectonic Plates Collide—A USGS P

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  Natural Hazards, Coastal and Marine Hazards and Resources Program, Earthquake Hazards, Earthquake Science Center, Pacific Coastal and Marine Science Center

  June 19, 2017

  Reducing risk where tectonic plates collide—U.S. Geological Survey subduction zone science plan

  The U.S. Geological Survey (USGS) serves the Nation by providing reliable scientific information and tools to build resilience in communities exposed to subduction zone earthquakes, tsunamis, landslides, and volcanic eruptions. Improving the application of USGS science to successfully reduce risk from these events relies on whole community efforts, with continuing partnerships among scientists and

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  Natural Hazards, Coastal and Marine Hazards and Resources Program, Earthquake Hazards, Earthquake Science Center, Geologic Hazards Science Center, Pacific Coastal and Marine Science Center

  January 28, 2016

  A submarine landslide source for the devastating 1964 Chenega tsunami, southern Alaska

  During the 1964 Great Alaska earthquake (Mw 9.2), several fjords, straits, and bays throughout southern Alaska experienced significant tsunami runup of localized, but unexplained origin. Dangerous Passage is a glacimarine fjord in western Prince William Sound, which experienced a tsunami that devastated the village of Chenega where 23 of 75 inhabitants were lost – the highest relative loss of a

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  Natural Hazards, Landslide Hazards, Geologic Hazards Science Center, Pacific Coastal and Marine Science Center

  March 26, 2014

  The 1946 Unimak Tsunami Earthquake Area: revised tectonic structure in reprocessed seismic images and a suspect near field tsunami source

  In 1946 at Unimak Pass, Alaska, a tsunami destroyed the lighthouse at Scotch Cap, Unimak Island, took 159 lives on the Hawaiian Islands, damaged island coastal facilities across the south Pacific, and destroyed a hut in Antarctica. The tsunami magnitude of 9.3 is comparable to the magnitude 9.1 tsunami that devastated the Tohoku coast of Japan in 2011. Both causative earthquake epicenters occurred

  November 1, 2012

  Influence of the Amlia fracture zone on the evolution of the Aleutian Terrace forearc basin, central Aleutian subduction zone

  During Pliocene to Quaternary time, the central Aleutian forearc basin evolved in response to a combination of tectonic and climatic factors. Initially, along-trench transport of sediment and accretion of a frontal prism created the accommodation space to allow forearc basin deposition. Transport of sufficient sediment to overtop the bathymetrically high Amlia fracture zone and reach the central A

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  Pacific Coastal and Marine Science Center

  October 26, 2012

  History of earthquakes and tsunamis along the eastern Aleutian-Alaska megathrust, with implications for tsunami hazards in the California Continental Borderland

  During the past several years, devastating tsunamis were generated along subduction zones in Indonesia, Chile, and most recently Japan. Both the Chile and Japan tsunamis traveled across the Pacific Ocean and caused localized damage at several coastal areas in California. The question remains as to whether coastal California, in particular the California Continental Borderland, is vulnerable to mor

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  Pacific Coastal and Marine Science Center

  May 1, 2012

  Tsunami hazards to U.S. coasts from giant earthquakes in Alaska

  In the aftermath of Japan's devastating 11 March 2011Mw 9.0 Tohoku earthquake and tsunami, scientists are considering whether and how a similar tsunami could be generated along the Alaskan-Aleutian subduction zone (AASZ). A tsunami triggered by an earthquake along the AASZ would cross the Pacific Ocean and cause extensive damage along highly populated U.S. coasts, with ports being particularly vul

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  Pacific Coastal and Marine Science Center
• News
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  September 7, 2018

  USGS-NOAA cruise maps Cascadia subduction zone to assess earthquake hazards

  From July 31 to August 23, a joint USGS-NOAA cruise mapped seafloor depths, texture, and gas seeps in the Cascadia subduction zone offshore of...

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  March 12, 2018

  Laboratory collaboration to study earthquake hazards off southeast Alaska and western Canada

  Studying the Queen Charlotte-Fairweather fault

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  February 16, 2018

  Workshops on subduction-zone science to reduce risk for communities

  The USGS Pacific Coastal and Marine Science Center hosted two back-to-back subduction-zone workshops in Santa Cruz, California, from February 5–8...

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  February 14, 2018

  USGS research featured on the cover of Eos

  USGS research on a big earthquake fault off Alaska and Canada is featured on the cover of Eos, a journal of Earth and space science news published by...

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