Item talk:Q227283
From geokb
{
"@context": "http://schema.org/", "@type": "WebPage", "additionalType": "Project", "url": "https://www.usgs.gov/centers/pcmsc/science/cascadia-subduction-zone-marine-geohazards", "headline": "Cascadia Subduction Zone Marine Geohazards", "datePublished": "August 1, 2022", "author": [ { "@type": "Person", "name": "Janet Watt", "url": "https://www.usgs.gov/staff-profiles/janet-watt", "identifier": { "@type": "PropertyValue", "propertyID": "orcid", "value": "0000-0002-4759-3814" } }, { "@type": "Person", "name": "Jenna C Hill", "url": "https://www.usgs.gov/staff-profiles/jenna-c-hill", "identifier": { "@type": "PropertyValue", "propertyID": "orcid", "value": "0000-0002-7475-357X" } }, { "@type": "Person", "name": "Danny Brothers", "url": "https://www.usgs.gov/staff-profiles/danny-brothers", "identifier": { "@type": "PropertyValue", "propertyID": "orcid", "value": "0000-0001-7702-157X" } }, { "@type": "Person", "name": "Nathaniel C Miller, PhD", "url": "https://www.usgs.gov/staff-profiles/nathaniel-c-miller", "identifier": { "@type": "PropertyValue", "propertyID": "orcid", "value": "0000-0003-3271-2929" } } ], "description": [ { "@type": "TextObject", "text": "John Wesley Powell Center for Analysis and Synthesis Working Groups" }, { "@type": "TextObject", "text": "As part of a broader collaborative effort within the USGS (Gomberg and others, 2017) and academia (for example, SZ4D) to advance subduction zone science and improve hazard assessment, we are working with our partners to integrate multi-resolution geophysical imaging and geological sampling to characterize offshore margin morphology, including submarine landslides, sediment delivery systems, seafloor seeps, active faults, and upper plate velocity structure in Cascadia. Because uplift and subsidence associated with megathrust earthquakes often crosses the coastline, coordinated onshore-offshore synthesis is vital to this effort." }, { "@type": "TextObject", "text": "Related news" }, { "@type": "TextObject", "text": "Related USGS Projects" }, { "@type": "TextObject", "text": "\u201cDeciphering Cascadia\u2019s history of mega-earthquakes using MBARI\u2019s unique deep-sea vehicles\u201d\n- MBARI\u2019s 2019 online annual report" }, { "@type": "TextObject", "text": "Academic: University of Washington, Humboldt State University, Oregon State University, Scripps Institution of Oceanography, University of Hawaii, Woods Hole Oceanographic Institution" }, { "@type": "TextObject", "text": "State: California Geological Survey, Washington Department of Natural Resources (DNR)" }, { "@type": "TextObject", "text": "Since 2018, the USGS and its partners have completed several research cruises spanning the entire U.S. Cascadia margin (Fig. 3)." }, { "@type": "TextObject", "text": "Partners/Collaborators" }, { "@type": "TextObject", "text": "Private: MBARI, Ocean Exploration Trust" }, { "@type": "TextObject", "text": "Globally observed correlations between marine forearc morphology and structure and megathrust earthquake slip, magnitude, and rupture length along subduction margins suggest possible correlations between seismic slip behavior and morphotectonic variability. Systematic morpho-tectonic analyses in Cascadia highlight distinct along-strike variations in morphology and structure that may reflect spatial variations in megathrust earthquake behavior (Watt and Brothers, 2020). Identification and regional mapping of active fault structures will enable further investigation of the links between megathrust behavior and upper plate morpho-tectonics. We plan to investigate the relationships between offshore geologic structure, seafloor morphology, seafloor seeps, and sediment dispersal pathways and depocenters. These efforts will help to identify potential tsunamigenic faults, offshore areas prone to strong shaking, portions of the slope susceptible to landslides, and/or optimal environment(s) for marine paleoseismology studies. Together, this information will provide information fundamental to improving regional hazard assessments and our ability to prepare for future events." }, { "@type": "TextObject", "text": "The Pacific Northwest is home to the Cascadia Subduction Zone, a 1,300 km-long tectonic boundary between the Juan de Fuca and Gorda oceanic plates to the west and the North America continental plate to the east (Fig. 1). The denser oceanic plates are converging with North America and subducting beneath the western edge of the continent. The interface between upper and lower plates is defined by a large fault, called a megathrust, as well as numerous smaller faults that cut through the surrounding crust (Fig. 2). Over time, frictional stresses accumulate along these faults, building slowly until they exceed the fault\u2019s strength, resulting in an earthquake. Subduction zone earthquakes are the largest on Earth, reaching magnitudes in excess of magnitude M9, and are known to generate large tsunamis." }, { "@type": "TextObject", "text": "Federal: NOAA, BOEM, NSF, EXPRESS, U.S. National Park Service, and scientists from multiple USGS Mission Areas (Natural Hazards, Ecosystems, Core Science Systems, Energy and Minerals)" }, { "@type": "TextObject", "text": "Societal Issue: Uncertainty related to rupture extent, slip distribution, and recurrence of past subduction megathrust earthquakes in the Pacific Northwest (northern CA, OR, WA, and southern BC) leads to ambiguity in earthquake and tsunami hazard assessments and hinders our ability to prepare for future events." } ], "funder": { "@type": "Organization", "name": "Pacific Coastal and Marine Science Center", "url": "https://www.usgs.gov/centers/pcmsc" }, "about": [ { "@type": "Thing", "name": "Cascadia" }, { "@type": "Thing", "name": "Earthquakes" }, { "@type": "Thing", "name": "Science Technology" }, { "@type": "Thing", "name": "Cascadia Margin" }, { "@type": "Thing", "name": "Marine cores" }, { "@type": "Thing", "name": "Information Systems" }, { "@type": "Thing", "name": "Geologic History" }, { "@type": "Thing", "name": "Seafloor Mapping" }, { "@type": "Thing", "name": "Marine Geologic Hazards" }, { "@type": "Thing", "name": "Maps and Mapping" }, { "@type": "Thing", "name": "Ocean" }, { "@type": "Thing", "name": "Energy" }, { "@type": "Thing", "name": "Paleotsunamis" }, { "@type": "Thing", "name": "subduction zone science" }, { "@type": "Thing", "name": "Landslides" }, { "@type": "Thing", "name": "Environmental Health" }, { "@type": "Thing", "name": "earthquakes" }, { "@type": "Thing", "name": "Coastal and Marine Hazards" }, { "@type": "Thing", "name": "Submarine landslides" }, { "@type": "Thing", "name": "Cascadia subduction zone" }, { "@type": "Thing", "name": "Subduction Zones" }, { "@type": "Thing", "name": "Water" }, { "@type": "Thing", "name": "Mapping" }, { "@type": "Thing", "name": "Subduction Zone" }, { "@type": "Thing", "name": "Coastal and Marine Hazards and Resources" }, { "@type": "Thing", "name": "Earthquakes and faults" }, { "@type": "Thing", "name": "Sediments" }, { "@type": "Thing", "name": "Natural Hazards" }, { "@type": "Thing", "name": "tsunamis" }, { "@type": "Thing", "name": "Sediment Cores" }, { "@type": "Thing", "name": "Paleotsunami" }, { "@type": "Thing", "name": "Methods and Analysis" }, { "@type": "Thing", "name": "Tsunamis" }, { "@type": "Thing", "name": "Geology" }, { "@type": "Thing", "name": "Submarine Landslides" }, { "@type": "Thing", "name": "Earthquakes and Faults" }, { "@type": "Thing", "name": "Sediment cores" }, { "@type": "Thing", "name": "Hazards" } ]
}
