Sunday
6A      Weekend Edition
9A      Climate One
10A    Word by Word
11A    Sundays M. O'Brien
1P     Crossing Borders
banner101 3
Computer models show a major tsunami pushing ocean water nearly to Guerneville
photo credit: Courtesy: California Geological Survey
A wall of water walloping Doran Spit. Estero Americano changing course, channeling the pacific upstream, nearly to Valley Ford, water lapping at the edges of the Rocky Memorial Dog Park in Petaluma.
The disaster scenario comes courtesy of the California Geological Survey, which Friday released updated tsunami evacuation maps for many counties, including Sonoma. 
 
Nick Graehl is an engineering geologist with the survey.
"The maximum tsunami flood elevation is about 19 to 26 feet." On much of San Francisco Bay, the same event would produce about a five foot rise, Graehl said.
 
 
Caused by certain types of offshore earthquakes displacing huge amounts of water, tsunami's are capable of tremendous devastation. One in 2004 killed a quarter million people, mainly in Asia. 
 
"The most significant tsunami source that could impact the county of Sonoma is from a large magnitude, nine plus, that would originate off the coast of Alaska, and the Aleutian Islands. A Tsunami from this source region, it would take about four hours to arrive in Sonoma, so people would have time to evacuate, if they are prepared."
  
Severe movement on local fault lines, such as one traversing Point Reyes would be significantly weaker, but Graehl said, local residents would have just minutes to react.
  
Interactive maps and tsunami preparedness information can be found on the website of the California Department of Conservation or by clicking here https://www.conservation.ca.gov/cgs/tsunami/maps/sonoma.
  • SoCo Calendar
  • Latest News
  • Right Now
  • Weather
  • Earthquakes
  • First News
 
 
Read More
 
thumbnail FirstNews logoA weekday early morning podcast that offers a first look at the top local news stories and weather forecast you need to start your day.

Sonoma County news stories featuring the latest in breaking news, county government, elections, environment, cultural happenings, and updates on your communities, from Petaluma to Cloverdale, and from Sonoma to Bodega Bay, and everyplace in between.

Subscribe to the Sonoma County First News podcast through our website, the NorCal Mobile App, NPR Podcasts, NPR One, iTunes/Apple Podcasts, or wherever you get your podcasts. 

 
Read More

Northern California
Public Media Newsletter

Get the latest updates on programs and events.