The Cascadia Earthquake Of 1700

Discussion in 'Earthquake' started by LastOutlaw, Aug 23, 2019.

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  1. LastOutlaw

    LastOutlaw Master Survivalist

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    How Scientists Know When The Last Big Earthquake Happened Here
    by Tullan Spitz OPB Jan. 26, 2015 midnight | Updated: Jan. 27, 2016 7:23 a.m. | Portland

    Neskowin Ghost Forest, 2012.

    Wolfram Burner/Flickr

    At approximately 9 p.m. Pacific Standard Time, Jan. 26, 1700, a magnitude 8 or 9 earthquake occurred on the Cascadia Subduction Zone, a 600-mile stretch between Vancouver Island, British Columbia and Cape Mendocino, California.

    What evidence points to an earthquake in 1700?
    Oral traditions of native people living in the Cascadia region reference numerous events of shaking and flooding in this time period, but those stories can’t be dated to specific calendar years.

    Scientists are well aware of the destructive power of other subduction zone quakes — like the 1960 magnitude 9.5 Chilean quake and the 1964 magnitude 9.5 quake in Alaska — so they were eager to chart the history of plate activity in the Cascadia Subduction Zone.

    In the 1980s and 1990s, scientists conducting fieldwork found evidence that coastal lands in the Northwest dropped suddenly and were inundated by tsunami waves and mud. All along the Oregon and Washington coast, the rapid advance of seawater had buried delicate marsh plants that were still alive and killed Sitka spruce, leaving behind rotting stumps. Rot-resistant western red cedar survived longer and their remnants became known as “ghost forests.”

    These sudden changes in the coastal landscape pointed heavily to an earthquake and tsunami.

    How could scientists know for sure?
    American researchers used carbon dating on the spruce, peat and fossilized plants. Sitka spruce as far apart as southern Washington and Northern California died from the high waters during the same few decades — sometime between 1695 and 1720. Their rings were wide right up through the last ring, proving that a sudden event rather than slow sea level rise was the culprit.

    How do they know the exact hour of the quake?
    “The Orphan Tsunami of 1700” by Brian Atwater.

    University of Washington Press

    After the American scientists published their work, Japan’s Kenji Satake published a letter in the journal “Nature” that summarized meticulous records from multiple locations in Japan describing high waves on Jan. 27 and 28.
    It was called Japan’s “orphan” tsunami because there was no earthquake locally that could have triggered it. There is also no evidence of a large earthquake in South America or Alaska at that time. The signs pointed to a quake from the Cascadia Subduction Zone.

    Satake explained that it would have taken a tsunami about 10 hours to travel from Cascadia to Japan, thus pinpointing the earthquake to about 9 p.m., Jan. 26. Because of the extent of the damage recorded in Japan, Satake estimated that it was approximately a magnitude 9 quake.

    Is there any other evidence?
    In 1997, scientists used dendrochronology — a method of dating trees by comparing ring patterns to samples of known age — on the ghost forest trees. They were able to determine the trees had stopped growing after completing the 1699 growing season, dating their death to somewhere between September 1699 and May 1700, further confirming the date independently of Japanese records.

    More evidence is on the ocean floor. Paleoseismologists have dated core samples of debris from earthquake-induced landslides. This data indicate a large earthquake with a lot of shaking was going on during this period — and that it was happening off the Oregon coast.

    And remember the native stories? Scholarly analysis of nine stories with sufficient details to assign date ranges narrowed the timeline to approximately 1701, remarkably close to the accepted date for the event.

    When is the CSZ likely to act up again?
    Over the last 10,000-years, earthquakes around magnitude 9 have occurred along the length of the Cascadia Subduction Zone 19 times — about every 526 years. The southern section of the CSZ has seen 19 additional quakes of 8 or higher. Here, very close to home, the average recurrence is every 234 years. With the last major event placed at 315 years ago, we’re due.
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  2. LastOutlaw

    LastOutlaw Master Survivalist

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  3. Old Geezer

    Old Geezer Legendary Survivalist

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    That area of America has been very aggressive about flipping God "the bird", so whatever happens to them, happens to them. Let them enter a black eternity absent God's Light.
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  4. Pragmatist

    Pragmatist Master Survivalist

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    Good morning Last Outlaw,

    Real interesting reading.

    Ref: "evidence on the ocean floor";

    My first job in the oil industry was with company that participated in Operation Moho, the research about the Mohorovicic Discontinuity, the area in the Earth where the crust and mantle merge. The mentioned paleoseismologists actually were pro-oil industry, at least at the time.

    If there's a natural sedative in our nation, it's got to be Cannon Beach, Oregon. The US northwest is currently under enemy occupation.

    If this Cascadic Zone is due for an earthquake, the area's 54 forty or negotiate mob can copy California's residential earth quake insurance program.

    Meanwhile, if there's a quake, we can bring 'em some FEMA tarps and Army Corps of Engineers Blue Roofs. We lost a beautiful area to the trash running the governments out there.
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  5. LastOutlaw

    LastOutlaw Master Survivalist

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    Most of that trash you mention is in the cities just like New York . There are a lot of Conservative people living elsewhere in the liberal states. Texas is headed in the same direction as more and more liberals move into Austin, Houston, Dallas, Fort Worth and San Antonio from California.
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  6. Old Geezer

    Old Geezer Legendary Survivalist

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    Catch the wave

    And ....

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  7. LastOutlaw

    LastOutlaw Master Survivalist

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    ESA Detects New Asteroid With Great Chance Of Hitting Earth
    By Inigo Monzon
    10/09/19 AT 5:30 AM

    Current Time?0:08
    Fly-by radar imaging shows tiny asteroid

    The European Space Agency (ESA) recently added a new asteroid into its Risk List due to the space rock’s chances of hitting Earth in the future. Based on the data collected by the ESA, the dangerous asteroid could collide with the planet in less than 70 years from now.

    According to the ESA, the asteroid has been identified as 2019 SU3. It is currently listed as the fourth most dangerous asteroid in the agency’s Risk List, which catalogs all space rocks with non-zero Earth impact probabilities.

    Aside from the Risk List, 2019 SU3 is also in the agency’s Priority List, which means the ESA is keeping a close eye on the asteroid’s trajectory.

    As of this writing, 2019 SU3 has only been in the ESA’s Risk List for only 12 days. According to the agency, the asteroid’s chances of hitting Earth are one out of 152.

    The ESA noted that the asteroid’s potential Earth impact might take place on Sept. 16, 2084. During this time, the asteroid is expected to approach Earth from a distance of only 0.00079 astronomical units or roughly 73,435 miles away.

    Given this short distance, a slight nudge on the asteroid could easily send it crashing to Earth. This can happen if the asteroid gets affected by the gravitational pull of nearby planets. According to the ESA, 2019 SU3 is an Apollo asteroid with a very wide orbit around the Earth and Sun. Occasionally, the asteroid’s orbit intersects with that of Earth.

    As 2019 SU3 completes its orbit, it sometimes passes near other planets including Venus, Mercury and Mars. The gravitational pull from any of these planets can easily alter the asteroid’s trajectory. By the time it reaches Earth’s vicinity, it might already be on a direct collision course with the planet.

    Fortunately, the asteroid is not big enough to cause a major impact event in case it collides with Earth. As indicated in ESA’s database, 2019 SU3 has an estimated diameter of about 46 feet. Due to its small size, the asteroid will most likely burn up in Earth’s atmosphere instead of hitting the ground.

    54d10bf720bccf5ae33b9cf1fa62564c.jpeg Over 17,000 near-Earth asteroids remain undetected in our solar neighborhood. Pictured; an artistic illustration of an asteroid flying by Earth. Photo: NASA
    poltiregist and TMT Tactical like this.
  8. Caribou

    Caribou Master Survivalist

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