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Thread: Largest and hottest shield volcano on Earth -- NOT Mauna Loa, but still Hawaiian

  1. #1
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    Largest and hottest shield volcano on Earth -- NOT Mauna Loa, but still Hawaiian

    Two islands form the top of the largest shield volcano on Earth, in Hawaii.

    QUOTE: A new study published in the Earth and Planetary Science Letters journal establishes that Pūhāhonu is the largest shield volcano in the world, taking Mauna Loa's title.
    Scientists surveyed the ocean floor and used quantitative modeling to determine that the volcano, which is about 171 miles long and 56 miles wide, is twice the size of Mauna Loa.

    https://www.cnn.com/2020/05/25/us/pu...scn/index.html
    Do good work. —Virgil Ivan "Gus" Grissom

  2. #2
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    One of the interesting factors in determining the volume of a mountain is estimating how much the overlying mass has depressed the crust, and determining the uncertainties involved. Also, none of these Hawaiian volcanoes erupted in isolation - they did so in concert with neighboring volcanoes. Deciding where to draw the dividing line between one volcano and the adjacent volcano further involves uncertainties. The method is laid out better in the source document:

    https://www.sciencedirect.com/scienc...12821X20302399

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    What about the "hottest" descriptor? I may have skimmed the story too quickly, but I don't recall seeing where that is addressed.

    CJSF
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    Quote Originally Posted by CJSF View Post
    What about the "hottest" descriptor? I may have skimmed the story too quickly, but I don't recall seeing where that is addressed.

    CJSF
    It's discussed in the source article. Briefly, they determine the mineral composition of the subject volcano to have a higher melting temperature than any other in the Hawaiian chain.

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    Quote Originally Posted by geonuc View Post
    It's discussed in the source article. Briefly, they determine the mineral composition of the subject volcano to have a higher melting temperature than any other in the Hawaiian chain.
    So not currently the hottest, but hottest when active?

    CJSF
    "Off went his rocket at the speed of light
    Flying so fast there was no day or night
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    He knows who's guilty 'fore there's even a crime

    Davy, Davy Crockett
    The buckskin astronaut
    Davy, Davy Crockett
    There's more than we were taught"

    -They Might Be Giants, "The Ballad Of Davy Crockett (In Outer Space)"


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  6. #6
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    Quote Originally Posted by CJSF View Post
    So not currently the hottest, but hottest when active?

    CJSF
    It seems so. Certainly, it's not real hot now. This characterization of the 'hotness' of a volcano is maybe a bit misleading. It refers to the melt temperature of the particular flavor of magma feeding (or fed) the volcano, not the actual temperature of the rock right now. Geologists will be very interested in the melt temperature, of course, but I'm not sure it's the kind of thing that would capture the interest of the general public. Unlike the size of the volcano. People like to know which of anything is the biggest.

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