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Acoustic emission (AE) recordings were made at the San Francisco Presidio during the times of the Lake Elsmanearthquake and its largest aftershock, the Loma Prieta earthquake aftershocks, and a small earthquake on the Hayward fault. Each earthquake generated abrupt increases in AE production at the time of arrival of the seismic waves that were clearly above the background rates. Sensitivity of AE to tidal strains was checked by comparison of the 30 kHz barkground AE and the strain recorded by one of the USGS strainmeters. At this site tidal strains are water than thermoelastic strains at semi-diurnal periods. A weak correlation between the rate of AE production and the observed strain is observed at these near-diurnal and semidiurnal periods. This suggests that AE production occurs at strain levels and strain rates even lower than those estimated to be caused by passage of seismic waves from the 1989 earthquakes

Low strain level acoustic emission due to seismic waves and tidal/thermoelastic strains observed at the San Francisco Presidio, California