 The 1700 Cascadia Earthquake was a magnitude 8.7 – 9.2 megathrust earthquake in 1700. The earthquake involved the Juan de Fuca Plate in the Pacific ocean, from mid-Vancouver Island of southwest Canada off British Columbia to northern California, off what is now known as the Pacific Northwest of the United States. Download high resolution version (502x739, 29 KB) Cascadia subduction zone. ...
The moment magnitude scale was introduced in 1979 by Tom Hanks and Hiroo Kanamori as a successor to the Richter scale and is used by seismologists to compare the energy released by earthquakes. ...
A megathrust earthquake is an interplate earthquake where one tectonic plate slips beneath (subducts) another. ...
An earthquake is a phenomenon that results from and is powered by the sudden release of stored energy that radiates seismic waves. ...
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Vancouver Island is separated from mainland British Columbia by the Strait of Georgia and the Queen Charlotte Strait, and from Washington by the Juan De Fuca Strait. ...
Motto: Splendor Sine Occasu (Latin: Splendour without diminishment) Official languages none stated in law; English is de facto Flower Pacific dogwood Capital Victoria Largest city Vancouver Lieutenant-Governor Iona Campagnolo Premier Gordon Campbell (BC Liberal) Parliamentary representation - House seat - Senate seats 36 6 Area Total - Land - Water (% of total) Ranked...
Official language(s) English Capital Sacramento Largest city Los Angeles Area Ranked 3rd - Total 158,302 sq mi (410,000 km²) - Width 250 miles (400 km) - Length 770 miles (1,240 km) - % water 4. ...
Darker red states are always considered part of the Pacific Northwest. ...
The fault slipped along about 1000 kilometers — around 600 miles.
It took place at about 9:00 in the evening of January 26, 1700. Although there were no written records in the region at the time, the earthquake's precise date is nevertheless known from Japanese records of a tsunami that has not been tied to any other Pacific Rim earthquake. 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 redcedar trees 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 tsunami. Oral traditions also exist among the region's original inhabitants, although these do not specify the date. January 26 is the 26th day of the year in the Gregorian calendar. ...
Events January 1 - Russia accepts Julian calendar. ...
The tsunami that struck Malé in the Maldives on December 26, 2004. ...
Pinus taeda Cross section showing annual rings, Cheraw, South Carolina Pine stump showing growth rings Dendrochronology or tree-ring dating is the method of scientific dating based on the analysis of tree ring patterns. ...
Binomial name Thuja plicata Donn ex D.Don Thuja plicata (Western Redcedar) is a species of thuja, an evergreen coniferous tree in the cypress family Cupressaceae, native to the northwestern United States and southwestern Canada, from southern Alaska and British Columbia south to northwest California and inland to western Montana. ...
Oral tradition or oral culture is a way of transmitting history, literature or law from one generation to the next in a civilization without a writing system. ...
Evidence supporting the occurrence of the 1700 earthquake has been gathered into the 2005 book, "The Orphan Tsunami of 1700," by geologist Brian Atwater and others. A geologist is a contributor to the science of geology, studying the physical structure and processes of the Earth. ...
// Overview Brian Franklin Atwater is a geologist who works for the United States Geological Survey and is also a research professor at the University of Washington. ...
The Cascadia Earthquake may be linked to the Bonneville slide. The Cascadia Earthquake Got from [1], a US government site that links to [2] on image rights. ...
The Bonneville Slide was a large landslide that took place in the Pacific Northwest of the United States, blocking the Columbia River. ...
Future threats
The geological record strongly indicates that "great earthquakes" (those with magnitude 8 or higher) occur in the Cascadia subduction zone about every 500 years on average, often accompanied by tsunamis. There is evidence for at least 13 events at intervals of from 300 to 900 years, with an average of 590 years. Previous earthquakes are estimated to have occurred in 1310, 810 and 170 BC. The moment magnitude scale (a successor to the Richter Scale), was introduced in 1979 by Tom Hanks and Hiroo Kanamori and is used by seismologists to compare the energy released by earthquakes. ...
Structure of the Cascadia subduction zone Area of the Cascadia subduction zone The Cascadia subduction zone is a very long sloping fault that stretches from mid-Vancouver Island to northern California. ...
The tsunami that struck Malé in the Maldives on December 26, 2004. ...
As the subduction zone ruptured, it would unleash a magnitude 9.0 earthquake and a tsunami headed for the coast. The shaking would last for about 4 or more minutes leaving many cities in ruins. Then the tsunami would hit land, destroying many remaining structures on the coast. After it was finished, the earthquake would probably be the strongest one to ever hit the Contiguous United States. The continental United States refers (except sometimes in U.S. federal law and regulations) to the largest part of the U.S. that is delimited by a continuous border. ...
As displayed in the 2004 Indian Ocean Earthquake, great damage can come from subduction zone tsunamis. In the case of a future Cascadia Earthquake, however, most of the damage would probably be from the earthquake itself due to the immense numbers of urban areas inluding three major cities and large quantity of vulnerable structures like brick buildings and highrises in the Cascadia region. The Cascadia coast is also armed with various tsunami alerts and escape routes. The tsunami caused by the December 26, 2004 earthquake strikes Ao Nang, Thailand. ...
Other subduction zones usually have such earthquakes every 100–200 years; the longer interval here may indicate unusually large stress buildup and subsequent unusually large earthquake slip.
The rate of convergence between the Juan de Fuca Plate and the North American Plate is 40 mm/yr. [1] hi ...
The North American plate is shown in brown on this map The North American Plate is a continental tectonic plate covering most of North America, extending eastward to the Mid-Atlantic Ridge and westward to the Cherskiy Range in East Siberia. ...
A millimetre (American spelling: millimeter, symbol mm) is an SI unit of length that is equal to one thousandth of a metre. ...
A year is the time between two recurrences of an event related to the orbit of the Earth around the Sun. ...
Similar megathrust earthquakes Other megathrust earthquakes are the slightly more powerful 1964 Alaskan Good Friday Earthquake measured at magnitude 9.2, the 1960 Great Chilean Earthquake measured at 9.5, and the 2004 Indian Ocean earthquake at a minimum of 9.0. Epicenter Fourth Avenue, Anchorage Turnagain Heights landslide Seward waterfront, mid-1964 The power of the tsunami is shown by its ability to impale this tire with a piece of wood. ...
The moment magnitude scale (a successor to the Richter Scale), was introduced in 1979 by Tom Hanks and Hiroo Kanamori and is used by seismologists to compare the energy released by earthquakes. ...
The Great Chilean Earthquake or Valdivia Earthquake (Terremoto de Valdivia in spanish) of May 22, 1960 is the largest magnitude earthquake recorded since seismographic monitoring began. ...
See also New Madrid Earthquake, which is estimated to have measured 8.0 or higher on the modern Richter Scale. The New Madrid Earthquake, the largest earthquake ever recorded in the continental United States, occurred on February 7, 1812. ...
The Richter magnitude test scale (or more correctly local magnitude ML scale) assigns a single number to quantify the size of an earthquake. ...
See also The following is a list of major earthquakes. ...
One of the many proposed flags of Cascadia, a blue-white-green tricolor with a Douglas fir in the center Cascadia is a geological, ecological and climatic region of North America. ...
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