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Portland Hills Fault using data from USGS and OpenStreetMap. Made using QGIS. The Portland Hills fault zone is the largest shallow fault that cuts beneath Portland, Oregon. [1] It stretches from Oregon City to Scappoose, and has a zone of deformation that extends at least 1,300 feet (400 m). [2]
[7] [4] [5] Seafloor core evidence indicates that there have been forty-one subduction zone earthquakes on the Cascadia subduction zone in the past 10,000 years, suggesting a general average earthquake recurrence interval of only 243 years. [2] Of these 41, nineteen have produced a "full margin rupture", wherein the entire fault opens up. [7]
Damaging earthquakes are well known in the Pacific Northwest, including several larger than magnitude 7, most notably the M9 1700 Cascadia earthquake and the M7.0–7.3 earthquake in about 900AD on the Seattle Fault. The M6.5 1965 Puget Sound earthquake shook the Seattle, Washington, area, causing substantial damage and seven deaths. This event ...
The team completed a detailed map of more than 550 miles of the subduction zone, down to the Oregon-California border. ... Earthquake and tsunami modelers are beginning to assess how the new data ...
A similar line aligns with the termination of the WRZ, SHZ, and Gales Creek Fault Zone (northwest of Portland), with faulting along the upper Nehalem River on the Oregon coast, [211] and a topographical contrast at the coast (between Neahkahnie Mountain and the lower Nehalem River valley) distinct enough to be seen on the seismicity map above ...
The most important clue linking the tsunami in Japan and the earthquake in the Pacific Northwest comes from studies of tree rings (dendrochronology), which show that several "ghost forests" of red cedar trees in Oregon and Washington, killed by lowering of coastal forests into the tidal zone by the earthquake, have outermost growth rings that formed in 1699, the last growing season before the ...
English: This map shows the seismic hazard zones in the United States. It also shows the states which are at a higher risk of receiving earthquakes. Date: 3 April 2012:
Short title: FINALWIKI1; Software used: Adobe Illustrator CS5: Date and time of digitizing: 06:53, 3 April 2012: File change date and time: 06:53, 3 April 2012