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Bourgeois Tsunami Recurrence Intervals Presentation



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Using tsunami deposits to determine earthquake and tsunami recurrence intervals opportunities and challenges Jody Bourgeois Earth Space Sciences University of Washington Seattle Washington Soldatskaia Bay Kamchatskii Peninsula We can use historic and pre historic deposits from tsunamis to Document tsunami hazard where unknown historically and where prehistoric tsunamis are larger Help produce probabilistic hazard maps Calculate tsunami recurrence intervals typically centuries long Understand tsunami behavior Calibrate test and enhance tsunami runup modeling Educate the public We can use historic and pre historic deposits from tsunamis to Document tsunami hazard where unknown historically and where prehistoric tsunamis are larger Help produce probabilistic hazard maps Calculate tsunami recurrence intervals typically centuries long Understand tsunami behavior Calibrate test and enhance tsunami runup modeling Educate the public QUESTIONS WHERE HOW BIG HOW OFTEN intro QUESTIONS WHERE HOW BIG HOW OFTEN intro Problem Historic records are short and tsunami recurrence intervals are long Oldest catalogued tsunami Mediterranean 4th c B C Japan 7th century China Central South America 16th century Philippines Indonesia 17th century Russian Far East Alaska 18th century North America New Zealand 19th century classified as definite Lander and Gusiakov 1997 and online catalogues How can geology help tell our hi story Copalis deposit mudflat deposits in years after tsunami tsunami deposit grassy field c 300 years ago Copalis River bank Washington State coast Coring at Willapa Bay for the longer tsunami record MaryAnn coring This and other cores tell us that large earthquakes and tsunamis occur on the Washington coast every 100 1000 years average 500 years There are similar records for all of Cascadia and also the Gulf of Alaska Willapa longer record 300 years ago Atwater Carver Clague Darienzo Gilpin Hemphill Haley Hutchinson Kelsey Nelson Peterson Williams Witter Turbidites



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