The Juan de Fuca plate is separated into three semi-independent segments, two of which are shown in Fig. Locate the volcano closest to you by visiting the map on our home page.Seven Cascade volcanoes have erupted since the beginning of the eighteenth century. The Juan de Fuca plate extends for about 600 miles (965km) from Vancouver Island in Canada, down to Cape Mendocino. The probable explanation lies in the rate of convergence between the Juan de Fuca and North American Plates. The Juan de Fuca microplate system of the Pacific Northwest in the United States (U.S.) and southern British Columbia is an interesting area of study for the field of tectonic geology.
These four diagrams illustrate the shrinking of the formerly very large Farallon Plate, as it was progressively consumed beneath the North American and Caribbean Plates, leaving only the present-day Juan de Fuca, Rivera, and Cocos Plates as small remnants (see text). The probable explanation lies in the rate of convergence between the Juan de Fuca and North American Plates. There are numerous other faults (or fault zones) in the Puget Lowland, and around its edges, sketchily studied and largely unnamed. The subduction of the Juan de Fuca plate beneath North America changes markedly along the length of the subduction zone, notably in the angle of subduction, distribution of earthquakes, volcanism, geologic and seismic structure of the upper plate, and regional horizontal stress.
During the past 4,000 years, periods of eruptive activity at various Cascade volcanoes have lasted for a few to tens of years per century. Volcanism occurs at Mount Hood and other Cascades arc volcanoes because of the subduction of the Juan de Fuca Plate off the western coast of North America. Mount Hood is a long-lived volcanic center that has erupted recurrently during the past 500,000 years, and geologic evidence records eruptions from a similar volcano at about the same site back to more than one million years ago. To investigate these characteristics, we conducted detailed density modeling experiments of the crust and mantle along … The Cascadia trench, which marks the subduction zone of all three segments, is less than 100 miles from the coastline. Locate the volcano closest to you by visiting the map on our home page.Seven Cascade volcanoes have erupted since the beginning of the eighteenth century. The Juan de Fuca plate is separated into three semi-independent segments, two of which are shown in Fig. Three features under the array were imaged: one high-velocity … The Juan de Fuca plate is converging at a rate of approximately 40 mm/yr with the North American plate in the direction N50E (Swanson et al., 1989). Other faults Actual. It separates the Juan de Fuca and North America plates. P wave travel time residuals from a 366-km-long seismic array operated in southern Oregon in 1982 are inverted. The map provided by the U.S. Geological Survey highlights 11 recent earthquakes, all occurring on the seabed of the Juan de Fuca tectonic plate, approximately 6 miles below the surface.
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