Sitka Tsunami Presentation

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Meteorologist Joel Curtis prepared these slides for the Sitka Local Emergency Planning Committee. He went through them on the air during a live call-in on KCAW from 6:35 to 8 p.m., Tuesday, Jan. 15. You can hear the show, here: http://www.kcaw.org/2013/01/14/whats-your-tsunami-story/

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Sitka Tsunami Presentation

  1. 1. Sitka LEPC Joel CurtisWarning Coordination Meteorologist January 10, 2013
  2. 2. Local Tsunami ThreatQuake 20 Seconds OR Difficulty Standing Up: Don’t Wait Around, Get to Higher Ground!
  3. 3. Early Saturday Jan. 5th http://earthquake.usgs.gov/earthquakes/eventpage/usc000ejqv#summary• 7.7M initially > 300 Miles Warning Area• Strike-Slip Fault – needs a landslide• Quake Felt – Widespread• Final 7.5M• Warning 2 Hours• 50 Km moved• 7 to 8 meters• Aftershocks
  4. 4. Dip-slip strike-slip earthquakes earthquakes here have here haveproduced large produced local Pacific wide landslide tsunamis tsunamis
  5. 5. Local Faults = Local Tsunamis Gastineau Channel Tongass Narrows
  6. 6. 1972 Off Sitka
  7. 7. Sitka July 30, 1972 M7.6• Few chimneys fell.• Minor landslides.• Slight damage Hoonah, Juneau, Pelican, & Yakutat.• Fairweather fault 75 kilometers moved• Seiches swimming pools to Seattle.• 19 aftershocks through August 29.• A tsunami of 4 inches at Sitka.
  8. 8. Factors: 1)Earthquake Magnitude 2) slope/submarine stability 3) Solid matter Displacement 4) Depth 5) Your Beach or Estuary
  9. 9. ContactJoel CurtisWarning Coordination MeteorologistNWS Juneau790-6803Joel.curtis@noaa.gov
  10. 10. ContactJoel CurtisWarning Coordination MeteorologistNWS Juneau790-6803Joel.curtis@noaa.gov

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