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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 ...
Another notable intraslab earthquake in the Puget Sound region was the magnitude 6.8 2001 Nisqually earthquake. Intraslab earthquakes in Cascadia occur in areas where the subducting plate has high curvature. [13] Much of the seismicity that occurs off the coast of northern California is due to intraplate deformation within the Gorda plate.
UTC time: 2001-02-28 18:54:32: ISC event: 1780664: USGS-ANSSComCat: Local date: February 28, 2001 (): Local time: 10:54:32 a.m. [1] Magnitude: 6.8 M w [1]: Depth: 57 km (35 mi) [1] Epicenter: 1]: Type: Normal [2]: Areas affected: Pacific Northwest: Total damage: $1–4 billion [3]: Max. intensity: MMI VIII (Severe) [4]: Peak acceleration: 0.3 g [4]: Tsunami: No: Casualties: 1 dead (heart ...
A fault off the Pacific coast could devastate Washington, Oregon and Northern California with a major earthquake and tsunami. Researchers mapped it comprehensively for the first time.
Why does Oregon practice earthquake drills? Based on past findings, scientists project that another large Cascadia quake is imminent. "We expect that sometime, possibly in our lifetime, there will ...
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]
"Basic Earthquake Emergency Communication Nodes" are locations in Portland where people can go to access emergency communications services if telephone service is down after an earthquake, or to report severe damage or injury. [5] Knott City Park is Parkrose Heights's designated Basic Earthquake Emergency Communication Node. [6]
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 ...