File:Juan-de-fuca-plate.PNG

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Description
English: Map showing the seismic record of the northwestern United States and southern British Columbia from 1870 to 2001(?). The green dots and circles represent shallow earthquakes within the continental crust of the North American Plate. Red dots and circles represent shallow to deep earthquakes within the oceanic crust of the Juan de Fuca, Explorer and Gorda Plates including the downgoing slab beneath the North American plate. The size of a symbol (small dot, larger dot, small circle, larger circle) corresponds to the magnitude of the earthquake it stands for. The triangles represent active volcanoes. The stippled lines paralleling the deformation front are isobaths of the downgoing slab, indicating that beneath Washington the dip angle of the slab is less steep than beneath Oregon and British Columbia. The white arrow points to the epicentre of the so-called Nisqually earthquake of 28 February 2001 (M 6.8) which was one of the heaviest earthquakes in the history of Washington state.
Deutsch: Karte der seismischen Aktivität im Nordwesten der USA und im Süden British Columbias in den Jahren 1870 bis 2001(?). Die grünen Punkte und Kreise repräsentieren Flachherdbeben in der kontinentalen Kruste der Nordamerikanischen Platte. Die roten Punkte und Kreise repräsentieren Flach- und Tiefherdbeben in der ozeanischen Kruste der Juan-de-Fuca-, Explorer-, und Gorda-Platte, einschließlich des subduzierenden Teils der Platte („slab“). Die Größe eines Symbols (kleiner Punkt, großer Punkt, kleiner Kreis, großer Kreis) entspricht der Stärke des Erdbebens, das es markiert. Die Dreiecke symbolisieren aktive Vulkane. Die gestrichelten Linien parallel zur Deformationsfront sind Isobathen des subduzierenden Teils der Platte, die zeigen, dass unter Washington der Abtauchwinkel des Slabs weniger steil ist als unter Oregon und British Columbia. Der weiße Pfeil zeigt auf das Epizentrum des sogenannten Nisqually-Bebens vom 28. Februar 2001 (M 6.8), eines der schwersten Erdebeben in der Geschichte des US-Bundesstaates Washington.
Date probably 2001
Source USGS website: Cascadia earthquake graphics: Cascadia seismicity, including February 28, 2001 magnitude 6.8 earthquake
Author unknown; 1870 to 1990 record compiled from maps figured in Craig S. Weaver, Kaye M. Shedlock (1996): Estimates of seismic source regions from considerations of the earthquake distribution and regional tectonics in the Pacific Northwest. USGS Open-File Report 91-441-R (online)

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Public domain
This image is in the public domain in the United States because it only contains materials that originally came from the United States Geological Survey, an agency of the United States Department of the Interior. For more information, see the official USGS copyright policy.

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Date/TimeThumbnailDimensionsUserComment
current11:30, 14 July 2015Thumbnail for version as of 11:30, 14 July 2015536 × 652 (46 KB)RokerHRO (talk | contribs)optipng -o7 -i0 → 15.00% decrease
19:55, 23 March 2006Thumbnail for version as of 19:55, 23 March 2006536 × 652 (54 KB)H-stt (talk | contribs)illustration of the juan-de-fuca-plate at the pacific coast from the website of the USGS at: http://wrgis.wr.usgs.gov/wgmt/pacnw/pacnweq/casceq.html {{PD-USGov-Interior-USGS}} Category:Seismology

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