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 |
![]() |
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 |