Examination of continuous water-level hydrographs from two artesian observation wells in the Piedmont near Newark, Delaware reveals water-level fluctuations caused by earthquakes and by earth tides. The effects of 14 distant earthquakes with MS (surface wave) magnitudes between 6.7 and 8.0 and MB (body wave) magnitudes between 5.9 and 7.0 (National Earthquake Information Service, 1975-1977) have been recorded over a two-year and ten-month period.
Please give proper credit to the Delaware Geological Survey.
Talley, J.H., 1980, Effects of Earthquakes and Earth Tides on Water Levels in Selected Wells in the Piedmont of Delaware: Delaware Geological Survey Open File Report R1
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