Search results
Results from the WOW.Com Content Network
The name "Cascadia" was first applied to the whole geologic region by Bates McKee in his 1972 geology textbook Cascadia; the geologic evolution of the Pacific Northwest. Later the name was adopted by David McCloskey, a Seattle University sociology professor, to describe it as a bioregion. McCloskey describes Cascadia as "a land of falling waters."
In 2004, a study conducted by the Geological Society of America analyzed the potential for land subsidence along the Cascadia subduction zone. It postulated that several towns and cities on the west coast of Vancouver Island, such as Tofino and Ucluelet, are at risk for a sudden, earthquake initiated, 1–2 m subsidence. [23]
Map of the Garibaldi Volcanic Belt centers. The Garibaldi Volcanic Belt in southwestern British Columbia is the northern extension of the Cascade Volcanic Arc in the United States and contains the most explosive young volcanoes in Canada. Like the rest of the arc, it has its origins in the Cascadia subduction zone.
Geology of the Cascade Range-related plate tectonics. See also: Geology of the Pacific Northwest and Cascade Volcanic Arc The Cascade Range is made up of a band of thousands of very small, short-lived volcanoes that have built a platform of lava and volcanic debris.
The arc formed due to subduction along the Cascadia subduction zone. Although taking its name from the Cascade Range, this term is a geologic grouping rather than a geographic one, and the Cascade Volcanoes extend north into the Coast Mountains, past the Fraser River which is the northward limit of the Cascade Range proper.
Cascadia earthquake sources A scenario of a magnitude 9.0 earthquake on the Cascadia subduction zone by the United States Geological Survey. The geological record reveals that great earthquakes with moment magnitude 8 or higher occur in the Cascadia subduction zone about every 500 years on average, often accompanied by tsunamis. There is ...
The last known great earthquake in the northwest was the 1700 Cascadia earthquake. [38] The geological record reveals that "great earthquakes" (those with moment magnitude 8 or higher) occur in the Cascadia subduction zone about every 500 years on average, often accompanied by tsunamis. There is evidence of at least 13 events at intervals from ...
The Puget Sound faults under the heavily populated Puget Sound region (Puget Lowland) of Washington state form a regional complex of interrelated seismogenic (earthquake-causing) geologic faults. These include (from north to south, see map) the: Devils Mountain Fault; Strawberry Point and Utsalady Point faults; Southern Whidbey Island Fault (SWIF)