Puget Sound Tsunami Sources Workshop

Parameter Estimates Matrix

by Stephen P. Palmer, WA-DNR

Delta Failure Scenario -- Extreme Event

Source Type:   Site-specific source, based on 1964 Valdez submarine landslide dimensions

Parameter Probable Range of Values
(MKS Units)
Confidence in Your Estimate
(On a scale of 0-10)
Probability of Occurrence
(% prob. in N yrs)
Location

Major river deltas in priority areas 1, 3, and 4

line 1 Unknown, if this large a submarine landslide can occur at all in these areas.
Geometry Length:   750 m

Width:   2500 m

Thickness:   40 m

Volume:   75 x 106 m3

3 Geometry of 1964 landslide well defined, but may not be applicable to Puget Sound.
Speed Determined by back
calculation using the 1894
Commencement Bay slide geometry and reported
wave height
5, once analyzed  
Slope Angle 15 degrees (4H:1V) 9  
Aspect Parallel to delta slope fall line 6