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The 1993 Scotts Mills earthquake, also known as the "Spring break quake", occurred in the U.S. state of Oregon on March 25 at 5:34 AM Pacific Standard Time. With a moment magnitude of 5.6 and a maximum perceived intensity of VII ( Very strong) on the Mercalli intensity scale, it was the largest earthquake in the Pacific Northwest since the Elk ...
The tremors during the September 1993 Klamath Falls earthquakes were some of the strongest felt in Oregon's history over the past 50 years. The first shock was only 4.2 M w. The two major quakes, which measured 5.9 and 6.0, were, up to that point in Oregon's history, the strongest recorded earthquakes and resulted in the most damage.
The 2001 Nisqually earthquake occurred at 10:54:32 local time on February 28, 2001, and lasted nearly a minute. [5] The intraslab earthquake had a moment magnitude of 6.8 and a maximum Mercalli intensity of VIII ( Severe ). The epicenter was in the southern Puget Sound, northeast of Olympia, but the shock was felt in Oregon, British Columbia ...
The Cascadia subduction zone is a 960 km (600 mi) fault at a convergent plate boundary, about 100–200 km (70–100 mi) off the Pacific coast, that stretches from northern Vancouver Island in Canada to Northern California in the United States. It is capable of producing 9.0+ magnitude earthquakes and tsunamis that could reach 30 m (98 ft).
Of particular concern are signals of massive earthquakes in the region’s geologic history. Many researchers have chased clues of the last “big one”: an 8.7-magnitude earthquake in 1700.
The 1700 Cascadia earthquake occurred along the Cascadia subduction zone on January 26, 1700, with an estimated moment magnitude of 8.7–9.2. The megathrust earthquake involved the Juan de Fuca Plate from mid- Vancouver Island, south along the Pacific Northwest coast as far as northern California. The plate slipped an average of 20 meters (66 ...
Earthquakes (6.0+ M w) between 1900 and 2017 Earthquakes are caused by movements within the Earth's crust and uppermost mantle.They range from weak events detectable only by seismometers, to sudden and violent events lasting many minutes which have caused some of the greatest disasters in human history.
The construction of dams, like The Dalles Dam, was central to the power supply of the region. The history of Oregon, a U.S. state, may be considered in five eras: geologic history, inhabitation by native peoples, early exploration by Europeans (primarily fur traders ), settlement by pioneers, and modern development. The term "Oregon" may refer to: