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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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Next figure-- Previous figure-- Table of Contents-- Pacific Northwest Earthquakes

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