Seismically-induced fluctuations of the water level in the Nunn-Bush well in Milwaukee

Expanded time-scale recordings of the water level in a well in Milwaukee, Wisconsin, show many of the familiar seismic phases, including Love waves which in theory have no associated dilatation. Comparison of seismograms from distant earthquakes recorded by the well seismograph at Milwaukee and by conventional inertial instruments at Palisades demonstrates the superior response of the well, relatively, to waves of long periods.