Tsunami: Emergency Survival ProgramYou can’t surf these waves! Contrary to popular belief, a tsunami isn’t one giant wave. It is a series of waves most commonly generated by great earthquakes below the ocean floor. Underwater landslides also can cause tsunamis.Tsunamis can travel at speeds up to 500 miles per hour in the open sea and reach heights of up to 100 feet in shallow coastal waters. Usually, however, tsunamis that reach California average 10 feet in height and peak in the 20-40 foot range. The first tsunami wave is seldom the highest or the last. Waves will continue to arrive for several hours, spaced minutes to hours apart. In fact, hundreds and perhaps thousands of people in the affected south Asian nations died in the catastrophic 2004 tsunami when they went to the ocean to see the impacts of the first waves and were swept to their deaths when subsequent waves struck. The time it takes for tsunami waves to reach the coast depends on where the earthquake or underwater landslide occurs. A tsunami caused by an earthquake a few miles off the coast is called a “locally generated” tsunami. It will arrive within minutes of the quake. Residents of coastal communities probably will feel such an earthquake. The earthquake may be the only warning of an approaching tsunami so it is important to respond quickly. Before the Next Tsunami or Tsunami Warning
During and After the Tsunami or Tsunami Watch
Extracted and adapted from “Tsunami! How to Survive This Hazard on California’s North Coast,” Humboldt Earthquake Education Center, Humboldt State University. Other sources included the FEMA publication “Are You Ready? Your guide to disaster preparedness,” and from information provided by the Governor’s Office of Emergency Services, Earthquake and Tsunami Program.
Child Friendly Video: "Tsunami Know What To Do": http://www.sdcounty.ca.gov/oes/ready/ (Susan Asturias) Detailed San Diego County Tsunami Inundation Map (State of California): |
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