National Oceanic and
Atmospheric Administration
United States Department of Commerce


FY 1997

West coast tides during Cascadia Subduction Zone tsunamis

Mofjeld, H.O., M.G.G. Foreman, and A. Ruffman

Geophys. Res. Lett., 24(17), 2215–2218, doi: 10.1029/97GL02060 (1997)

Low, neap tides occurred along the West Coast of the United States and Canada around 0500 UT January 27, 1700, a time for the last major Cascadia earthquake/tsunami based on teletsunami arrival times in Japan [Satake et al., 1996]. However, high-range perigean spring tides occurred only a week later, illustrating how accurately occurrence times must be known to constrain the region's background water levels during such events. The ranges of background water levels increase northward from 3 m at Monterey to 8.5 m at Queen Charlotte, as estimated from the amplitudes of perigean spring tides and subtidal winter fluctuations.

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