This article examines the reliability of tsunami recordings from tidal wells. Mareograms of tides, storm surges, and tsunamis recorded in tidal wells are introduced to determine their usefulness for observing variations in recorded sea levels and vertical speeds. A dynamic model is presented to discover whether the sea level near the coast can be well detected even in a tidal well. The sea level's vertical speed is affected by the structure of the well and by frequency characteristics of the sea level variations just outside it.
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