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[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]
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]
The Rocky Butte jail, completed in 1947, [40] served as the major facility for male prisoners in Multnomah County, with a courtyard and recreation field. [40] According to Rubin (1973), the Rocky Butte jail housed 320 inmates, [41] but Houston, Gibbons, and Jones (1988) claimed that it often exceeded this limit. [40]
To map the subduction zone, researchers at sea performed active source seismic imaging, a technique that sends sound to the ocean floor and then processes the echoes that return. The method is ...
The East Buttes are made up of several extinct volcanoes in and around Gresham, Oregon, United States, which are part of the Boring Lava Field. The Boring Lava Field became active at least 2.7 million years ago, and has been extinct for about 300,000 years.
With a variable topography, the Portland area ranges from river valley floors to terraces reaching elevations of 400 feet (120 m). [17] The Willamette Valley is marked by hills reaching heights of more than 1,000 feet (300 m), [18] and it is also physically separated from the lower Columbia River valley. [17]
Portion of Umpqua County which lay east of the Coast Range summit: Named for senator Stephen A. Douglas, a supporter of Oregon's admission to the union. 112,435: 5,037 sq mi (13,046 km 2) Gilliam County: 021: Condon: 1885: Eastern third of Wasco County: Named for Oregon pioneer Cornelius Gilliam (1798–1848). 2,026: 1,204 sq mi (3,118 km 2 ...
Kelly Butte Natural Area is a city park of about 23 acres (9.3 ha) in southeast Portland in the U.S. state of Oregon, just east of Interstate 205. The park is named after pioneer Clinton Kelly, who settled the area east of the Willamette River in 1848. [ 2 ]