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Author Topic: The Cascadia Subduction Zone  (Read 10830 times)

Yowbarb

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Re: The Cascadia Subduction Zone
« Reply #15 on: January 22, 2016, 02:35:43 PM »
Quote
I’m just wondering if Jim Farmer or Linda may have posted anything on this, connecting the dots.

Nothing significant from me, but I remember a headline about an article expressing serious concern about possible earthquakes in that region. -- Jim

Thanks, Jim...
We will keep an eye on it...

Yowbarb

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Re: The Cascadia Subduction Zone
« Reply #16 on: January 22, 2016, 05:38:49 PM »
This is the latest one, as of the time of the screen shot. About 5:30 PM PST.
On the bottom edge of the subduction zone.

The next image is the largest quake recently 4.5 on the 19th.

http://pnsn.org/earthquakes/recent

Yowbarb

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Re: The Cascadia Subduction Zone
« Reply #17 on: January 22, 2016, 06:12:07 PM »
https://en.wikipedia.org/wiki/1700_Cascadia_earthquake

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,[3] and may also be linked to the Bonneville Slide and the Tseax Cone eruption in British Columbia.

Evidence

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.[8] 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,[7] and archaeological research in the region has uncovered evidence of several coastal villages having been flooded and abandoned around 1700.

Cultural research[edit]

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.[6][10] 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.[12] 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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« Last Edit: January 22, 2016, 06:24:41 PM by Yowbarb »

Yowbarb

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Re: The Cascadia Subduction Zone
« Reply #18 on: January 24, 2016, 04:45:22 PM »
Sent to me by Global Moderator Ruth: This is the name of the video which corresponds to the link she sent:

Yellowstone Supervolcano Report Buffalo and Earthquakes Thank you mtech.edu
Published on Jan 21, 2016
www.marygreeley.com
...

Has references to the 6.6 quake off west coast of Mexico and shows it connects to the Juan de Fuca fault line which goes up to Pacific NW.

https://www.youtube.com/watch?v=o5uZY1Mw0Ao
« Last Edit: January 24, 2016, 06:39:58 PM by Yowbarb »

Yowbarb

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Re: The Cascadia Subduction Zone
« Reply #19 on: January 26, 2016, 02:29:29 PM »
Small quake in WA state, latest one in the PSNC map. 1.0 08:49 AM PST today...
...

http://pnsn.org/earthquakes/recent#

Yowbarb

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Re: The Cascadia Subduction Zone
« Reply #20 on: March 19, 2016, 11:57:14 PM »
Here's just a quick excerpt from Dutchsince,
...
http://dutchsinse.com/

...Clearly things are on the move below the Pacific plate.  The deep earthquakes over the past several days are another sign of the new unrest event spreading out across the whole region.

The activity around the Pacific plate has been building over the past several days.

Over the past week, multiple deep M4.0+ earthquakes built into several M5.0+ earthquakes (up to March 18).  As the earthquakes grew in magnitude, they spread out across the region – giving away the fact that a new unrest event was (is) brewing in certain regions of the West + North Pacific.

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Re: The Cascadia Subduction Zone
« Reply #21 on: March 20, 2016, 12:11:42 AM »
Note: Go to the page to stay informed. Washington, Oregon, and neighboring regions.
...
https://pnsn.org/  PNSN  Pacific Northwest Seismic Network

https://pnsn.org/earthquakes/recent 

Big events are mapped within minutes, smaller events may take half a day to show up.

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Re: The Cascadia Subduction Zone
« Reply #22 on: March 30, 2016, 02:31:53 PM »
Note: A 5.5 in the Cascadia Subduction Zone, the 18th.

The quake shown in red on screen shot: M4.6 - 257km WNW of Ferndale, California  2016-03-30 15:47:45 (UTC-04:00) EST
...

PNSN  Pacific Northwest Seismic Network   http://pnsn.org/

Recent Events:
http://pnsn.org/earthquakes/recent

Yowbarb

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Re: The Cascadia Subduction Zone
« Reply #23 on: March 30, 2016, 03:06:08 PM »
Yowbarb Note: See at this page how the quake this morning, offshore from Ferndale, CA connects to the Juan de Fuca Ridge.
...

http://earthquake.usgs.gov/earthquakes/eventpage/us20005dh8#general_map

http://pnsn.org/earthquakes/recent   2016-03-30 15:47:45 UTC (8 AM PDT)

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Re: The Cascadia Subduction Zone
« Reply #24 on: April 03, 2016, 02:48:03 AM »

Yowbarb

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Re: The Cascadia Subduction Zone
« Reply #25 on: April 04, 2016, 02:55:13 AM »

Yowbarb

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Re: The Cascadia Subduction Zone
« Reply #26 on: April 20, 2016, 07:39:15 PM »

Yowbarb

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Re: The Cascadia Subduction Zone
« Reply #27 on: October 22, 2016, 12:51:09 AM »
Yowbarb Note: On this page you click Recent EQ List to view latest quakes.
...

https://pnsn.org/earthquakes/

Recent map, as of 12:45 AM PDT Oct 22, 2016

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Re: The Cascadia Subduction Zone
« Reply #28 on: October 23, 2016, 12:05:56 AM »
Pacific Northwest Seismic Zone & area, 0250 AM EDT, Oct 23, 2016

Yowbarb

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Re: The Cascadia Subduction Zone
« Reply #29 on: December 29, 2016, 01:18:34 AM »
https://www.pnsn.org/earthquakes/recent/list  Recent Earthquakes List

https://www.pnsn.org/earthquakes/recent  Earthquakes PNSN Recent Events

 

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