Big volcano errupting La Palma in the Canary Islands

Discussion in 'All Things Boats & Boating' started by sdowney717, Sep 19, 2021.

  1. sdowney717
    Joined: Nov 2010
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    Location: Newport News VA

    sdowney717 Senior Member

    LIVE: Volcano erupts on La Palma in the Canary Islands - YouTube
    upload_2021-9-19_18-33-14.png

    Just 3 days ago, raised to yellow alert

    Volcano alert on the Canary Islands' La Palma after almost a THOUSAND earthquakes are detected | Daily Mail Online
    More than 11 million cubic metres (388 million cubic feet)of magma have seeped into Cumbre Vieja in recent days, swelling the peak by around 6 centimetres, the Volcanic Institute of the Canaries said.

    What is of major interest is if the cracked side of the mouintain collapses in the ocean

    "A 2001 research article claimed a change in the eruptive activity of Cumbre Vieja volcano and a fracture on the volcano that formed during the 1949 eruption may be the prelude to a giant ridge collapse.

    Authors Steven N Ward and Simon Day estimated such a collapse could cause tsunamis across the entire North Atlantic and severely impact countries as far away as North America."
     
  2. sdowney717
    Joined: Nov 2010
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    sdowney717 Senior Member

    Could you ride out a mage tsunami on a boat moored along the eastern coast? There will be an 8 hour period to prepare before the tsunami hits, take 8 hours for the wave to get here from there. Wave height would be around 100 feet, so would not have to get too far inland. All the highways would be jammed with people, and maybe impassable, get out immediately if news like that happens. But some people might not be able to flee, could they get on a boat and unslip the lines and survive. My house is about 40 feet above the water, which means could be more than 60 feet over the top of the roof.

    But would the wave be a steady rise or a sudden breaking wave. The tsunami I have seen on videos all seem to be a steady relentless rising water.
     
  3. Mr Efficiency
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    Mr Efficiency Senior Member

    Get out into very deep water would be the way to go.
     

  4. ImaginaryNumber
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    ImaginaryNumber Imaginary Member

    As Mr Efficiency said, just get your boat to deep water. You probably won't even know when the tsunami goes past you.

    How does tsunami energy travel across the ocean and how far can tsunamis waves reach?

    Once a tsunami has been generated, its energy is distributed throughout the water column, regardless of the ocean's depth. A tsunami is made up of a series of very long waves. The waves will travel outward on the surface of the ocean in all directions away from the source area, much like the ripples caused by throwing a rock into a pond. The wavelength of the tsunami waves and their period will depend on the generating mechanism and the dimensions of the source event. If the tsunami is generated from a large earthquake over a large area, its initial wavelength and period will be greater. If the tsunami is caused by a local landslide, both its initial wavelength and period will be shorter. The period of the tsunami waves may range from 5 to 90 minutes. The wave crests of a tsunami can range from a few to a hundred kilometers or more apart as they travel across the ocean. As the waves approach the coast, their wavelength decreases and wave height increases.

    On the open ocean, the wavelength of a tsunami may be as much as two hundred kilometers, many times greater than the ocean depth, which is on the order of a few kilometers. In the deep ocean, the height of the tsunami from trough to crest may be only a few centimeters to a meter or more - again depending on the generating source. Tsunami waves in the deep ocean can travel at high speeds for long periods of time for distances of thousands of kilometers and lose very little energy in the process. The deeper the water, the greater the speed of tsunami waves will be.

    For example, at the deepest ocean depths the tsunami wave speed will be as much as 800 km/h, about the same as that of a jet aircraft. Since the average depth of the Pacific ocean is 4000 m (14,000 feet) , tsunami wave speed will average about 200 m/s or over 700 km/h (500 mph). At such high speeds, a tsunami generated in Aleutian Islands may reach Hawaii in less than four and a half hours. In 1960, great tsunami waves generated in Chile reached Japan, more than 16,800 km away in less than 24 hours, killing hundreds of people.


    Tsunamis slow down but grow in size as they come ashore.
    [​IMG]
     
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