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Author Topic: Cascadia Earthquake of 1700, also some important links  (Read 1400 times)


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Cascadia Earthquake of 1700, also some important links
« on: April 14, 2016, 12:40:55 PM »
Yowbarb Note: I started a Topic in the Earth Changes Board called The Cascadia Subduction Zone
Here are two -three links from that topic: Pacific Northwest Seismic Network
A couple of Videos:
Physicist and futurist, Dr. Michio Kaku joins Shepard Smith on FOX NEWS to confirm that the danger is far from overstated. "The Cascadia fault is an earthquake waiting to happen," said Kaku  Michio Kaju - Cascadia   Report: Mega-quake could kill 13,000 in Pacific Northwest

1700 Cascadia earthquake

From Wikipedia, the free encyclopedia

The 1700 Cascadia earthquake occurred along the Cascadia subduction zone on January 26 with an estimated moment magnitude of 8.7–9.2. The megathrust earthquake involved the Juan de Fuca Plate that underlies the Pacific Ocean, from mid-Vancouver Island in British Columbia, Canada, south along the Pacific Northwest coast as far as northern California. The length of the fault rupture was about 1,000 kilometers (620 miles) with an average slip of 20 meters (66 ft).

The earthquake caused a tsunami that struck the coast of Japan, and may also be linked to the Bonneville Slide and the Tseax Cone eruption in British Columbia.


Evidence supporting the occurrence of the 1700 earthquake has been gathered into the 2005 book The Orphan Tsunami of 1700, by Brian Atwater, Kenji Satake, David Yamaguchi, and others.

The evidence suggests that it took place at about 21:00 on January 26, 1700 (NS). Although there were no written records in the region at the time, the earthquake's precise time is nevertheless known from Japanese records of a tsunami that has not been tied to any other Pacific Rim earthquake. The Japanese records exist primarily in the prefecture of Iwate, in communities such as Tsugaruishi, Kuwagasaki and Ōtsuchi.

Scientific research

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 tsunami. This includes both inland stands of trees, such as one on the Copalis River in Washington, and pockets of tree stumps that are now under the ocean surface and become exposed only at low tide.

Sediment layers in these locations also demonstrate a pattern consistent with seismic and tsunami events occurring around this time. Core samples from the ocean floor, as well as debris samples from some earthquake-induced landslides in the Pacific Northwest, also support the timing of the event, and archaeological research in the region has uncovered evidence of several coastal villages having been flooded and abandoned around 1700.

Cultural research

Local Native American and First Nations groups residing in Cascadia did not have a written tradition of record-keeping, so the event is not as well-documented locally as the Japanese tsunami is. However, numerous oral traditions describing a great earthquake and tsunami-like flooding do exist among indigenous coastal peoples all the way from British Columbia to Northern California. These do not specify an exact date, and not all earthquake stories in the region can be definitively isolated as referring to the 1700 quake in particular; however, virtually all of the native peoples in the region have at least one traditional story of an event much stronger and more destructive than any other that their community had ever experienced.

Some of the stories do contain temporal clues — such as an estimate of how many generations had passed since the event — which can be traced back to a date range in the late 1600s or early 1700s, or which concur with the event's timing in other ways. The Huu-ay-aht legend of a large earthquake and ocean wave devastating their settlements at Pachina Bay, for instance, speaks of the event occurring on a winter evening shortly after the village's residents had gone to sleep. Masit was the only community on Pachina Bay not to have been wiped out, as it sat on a mountainside approximately 75 feet above sea level. Nobody else from Pachina Bay survived the event — Anacla aq sop, a young woman who happened to be staying at Kiix?in on the more tsunami-sheltered Barkley Sound at the time of the event, came to be known as the last living member of her community.

Kwakwaka'wakw (Kwakiutl) stories from the north end of Vancouver Island report a nighttime earthquake which caused virtually all houses in their community to collapse; Cowichan stories from Vancouver Island's inner coast speak of a nighttime earthquake, causing a landslide that buried an entire village. Makah stories from Washington speak of a great nighttime earthquake, of which the only survivors were those who fled inland before the tsunami hit. The Quileute people in Washington have a story about a flood so powerful that villagers in their canoes were swept inland all the way to the Hood Canal.

Ethnographic research has focused on a common regional pattern of art and mythology depicting a great battle between a thunderbird and a whale, as well as cultural signifiers such as earthquake-inspired ritual masks and dances


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