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Earthquakes-Rattling the Earth's Plumbing System

Water-level fluctuations caused by the 1964 magnitude(M) 8.5 Alaska earthquake were recorded in 716 wells in the United States (Vorhis, 1966); the earthquake also was registered on water-level recorders in many other countries. Responses of water levels in wells to earthquakes are influenced by such factors as the magnitude and depth of the earthquake, distance from the epicenter, and the hydrogeologic environment, which may be consolidated rock, unconsolidated sediment, karst, or hydrothermally altered. The depth of the well, whether the aquifer is confined or unconfined, and well construction also influence the degree of water-level fluctuations in wells in response to seismic waves. Some aquifers may act as resonators, which may amplify the response.