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The Big One (Earthquake) - will be PNW, not CA

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  • #61
    As current earthquake related thread ...

    Deadly earthquake traveled at 'supersonic' speeds—, why that matters

    A powerful temblor in Indonesia offered a detailed look at supershear, a phenomenon that can create the geologic version of a sonic boom.
    ...
    When the earthquake struck on September 28, 2018, Indonesia's Sulawesi island flowed like water. Currents of mud swallowed anything in their paths, sweeping away entire sections of the city of Palu and crosscutting the region's neat patchwork of crop fields. Minutes after the shaking began, locals were caught unaware by a wall of water that crashed onshore with devastating results.

    As the sun set that evening, thousands were missing. Within days, the smell of corpses permeated the air. The 7.5-magnitude event was 2018's deadliest quake, killing more than 2,000 people.

    In the efforts to understand how this fatal series of events clicked into place, much attention has focused on the surprise tsunami. But a pair of new studies, published February 4 in Nature Geoscience, tackles another remarkable aspect: The earthquake itself was likely an unusual and incredibly fast breed of temblor known as supershear.

    The Palu quake cracked through the earth at nearly 9,200 miles an hour—fast enough to get from LA to New York City in a mere 16 minutes. Such a fast rupture causes earthquake waves to pile up in what's known as a Mach front, similar to the pressure wave from a plane traveling at supersonic speed. This concentrated cone of waves can amplify the quake's destructive power.
    ....
    https://www.nationalgeographic.com/s...eed-indonesia/
    TANSTAAFL = There Ain't No Such Thing As A Free Lunch

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    • #62
      This Earthquake Drowned the Pacific Northwest

      https://www.youtube.com/watch?v=K_sJ0QJ31fc

      Only part of the PNW, but interesting graphics here.
      TANSTAAFL = There Ain't No Such Thing As A Free Lunch

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      • #63
        Silent earthquakes are tied to changes in fluid deep below Cascadia's fault

        https://www.livescience.com/cascadia...und-fluid.html
        TANSTAAFL = There Ain't No Such Thing As A Free Lunch

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