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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]
The network is also affiliated with the University of Oregon Department of Geology. [6] It is the second largest of the regional seismic networks in the ANSS (Advanced National Seismic System) and has produced more data than the networks in the states of Alaska, Utah, Nevada, Hawaii and the New Madrid, Missouri-Tennessee-Kentucky-Arkansas area.
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 ...
Studies of past earthquake traces on both the northern San Andreas Fault and the southern Cascadia subduction zone indicate a correlation in time which may be evidence that quakes on the Cascadia subduction zone may have triggered most of the major quakes on the northern San Andreas during at least the past 3,000 years or so. The evidence also ...
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 ...
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 ...
A 6.1 magnitude earthquake occurred approximately 173 miles off the coast of Bandon, Ore. at approximately 1:15 p.m. Wednesday, according to the U.S. Geological Survey.
Portland (/ ˈ p ɔːr t l ə n d / PORT-lənd) is the most populous city in the U.S. state of Oregon, located in the Pacific Northwest region. Situated close to northwest Oregon at the confluence of the Willamette and Columbia rivers, it is the county seat of Multnomah County, Oregon's most populous county.