subduction :

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  • n  a geological process in which one edge of a crustal plate is forced sideways and downward into the mantle below another plate

  • In the subduction volcano, the magma is composed largely of andesite, which is a melt relatively rich in silica, water vapor and other gases.
  • Christiansen and others suspect that magma is produced in the subduction zone, the border between the diving plate and the lower mantle.
  • Because the ocean floor moves like a conveyor belt, rising to form ridges and diving back into the earth in a process called subduction, Hagstrum says, "half of the ocean floor has .
News & Articles

  • New 'embryonic' subduction zone found
    A new subduction zone forming off the coast of Portugal heralds the beginning of a cycle that will see the Atlantic Ocean close as continental Europe moves closer to America.
    June 17, 2013 - Science Daily
  • Past megaquakes left mark on Canadian coast
    By Becky OskinLiveScienceThanks to decades of geologic detective work, scientists know that on Jan. 26, 1700, at 9 p.m., a massive earthquake and tsunami hit the Pacific Northwest.Born from the Cascadia Subduction Zone, the earthquake may have cleaved the 620-mile-long (1,000 kilometers) offshore fault from Northern California to Canada. Researchers don't yet know; they must play connect the ...
    June 17, 2013 - NBC NEWS
  • New Subduction Zone Forming Off Spain's Coast
    A budding subduction zone offshore of Spain heralds the start of a new cycle that will one day pull the Atlantic Ocean seafloor into the bowels of the Earth, a new study suggests.
    June 14, 2013 - via Yahoo! News

  • Jay Inslee in Seattle Times
    Citing the parallels between that area's geological vulnerability and a large fault off Washington state, Inslee said, "The Cascadia subduction zone is the evil twin of the Indonesian fault zone, where that disaster happened."

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