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From Hawaii to the bend in the Hawaiian-Emperor chain is about 4000 km. If the Pacific plate is moving 8.0 cm a year, estimate how long ago the direction of plate motion changed. (The San Andreas Fault in southern California became active at about the same time!)

Does anyone have an answer?

  • Astronomy -

    This sounds more like geology (or planetary studies) than astronomy.
    Presumably the direction of plate motion changed where there is a bend in the chain. So..
    Divide 4000*10^3 m by 0.08 m/year.

    You get 50 million years.

  • Astronomy -

    Thank you!

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