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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).
The Portland/Vancouver Basin ecoregion (named for the cities of Portland and Vancouver) is a geological depression at the base of the Portland Hills fault-block. It contains the confluence of the Willamette and Columbia Rivers and is composed of deltaic sands and gravels deposited by Pleistocene floods, notably the Missoula Floods. Elevation ...
Port Hills Fault: South Island, New Zealand: Oblique-thrust: Active: 2011 Christchurch (M6.3) Puente Hills Thrust: 40: San Gabriel Valley, United States: Blind thrust: Active: 1987 Whittier Narrows (M5.9) Queen Charlotte-Fairweather Fault: 800: Canada and Alaska: Dextral: Active: 1949 Graham Island (M8.1), 1958 Lituya Bay (M7.8), 2012 Haida ...
Among them are the Portland Hills Fault on the city's west side, [78] and the East Bank Fault on the east side. [79] According to a 2017 survey, several of these faults were characterized as "probably more of a hazard" than the Cascadia subduction zone due to their proximities to population centers, with the potential of producing magnitude 7 ...
The USGS and the Southern California Earthquake Center in 2005 said that a magnitude 7.5 quake on that fault system, which runs underneath downtown and broad swaths of Southeast L.A. County, the ...
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Then they divide the area into a grid of zones each measuring about 4 square feet. Investigators collect evidence that could include footprints, campfire remains, lighting strike ash or burned ...
The Seattle fault zone is where the forward edge of the slab, coming to the top of the ramp, breaks and slips into the Seattle Basin. In this model the Tacoma fault zone is primarily the result of local adjustments as the slab bends upward at the bottom of the ramp.