Horizontal-to-Vertical Spectral Ratio (HVSR) Passive Seismic at the Callahan Mine Superfund Site in Brooksville, Maine: October 2016 to July 2018
The horizontal-to-vertical spectral ratio (HVSR) method is a passive seismic technique that uses a three-component seismometer to measure the vertical and horizontal components of ambient seismic noise. Seismic noise in the range of ~0.1 to 1 Hertz (Hz) is caused by ocean waves, large regional storms, and tectonic …