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Pacific Northwest Earthquakes
Figure 23.
Tide gage records showing tsunami waves from the March 27, 1964
, Alaska earthquake
(magnitude 8.3) as recorded at four sites in the Pacific Northwe
st. Superimposed on the normal tide fluctuations having a period
of about 12 hours (see predicted curve at Friday Harbor) are mo
re rapid oscillations that have periods of about 1/2 hour that w
ere caused by tsunami waves. Note the differences in
tsunami wave amplitudes at different sites. (Modified from Spaet
h and Berkman, 1972.)
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