Seismic Signals in Well Water Observations
Seismic signalsin well water observations– temporal rise or fall in well water level fluctuations induced by earthquakes.
Seismic waves generated during an earthquake cause oscillations and permanent offsets in well water levels. Liu et al. (1989) explained the oscillations in terms of expansion and contraction of pore pressure changes induced by seismic waves. Systematic monitoring of well water levels has led to identification of anomalous pre-, co-, post-, and transient changes in well water levels related to earthquakes (Roeloffs 1996). These signals are believed to reflect pore pressure changes related to the redistribution of stress in the near and far fields of dislocation sources. The co-, post-, and transient seismic changes appear as a step or spikelike anomaly in well water oscillations and recover post-earthquake depending on the transmissivity of the...
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