Horizontal-to-Vertical Spectral Ratio (HVSR) Soundings in Broome, Chenango, Franklin, Orange, Rensselaer, and Saratoga Counties, New York, and Susquehanna County, Pennsylvania 2010-2019

From 2010 through 2019, the U.S. Geological Survey, in cooperation with the New York State Department of Environmental Conservation, collected horizontal-to-vertical seismic soundings at locations in upstate New York and in Susquehanna County, Pennsylvania to evaluate the technique (control-point measurements) and to support aquifer-mapping projects (Heisig, 2013, 2015). he HVSR technique, commonly referred to as the passive-seismic method, is used to estimate the thickness of unconsolidated sediments and the depth to bedrock (Lane and others, 2008; Fairchild and others, 2013). The passive-seismic method uses a single, broad-band three-component (two horizontal and one vertical) seismometer to record ambient seismic noise. In areas that have a strong acoustic contrast between the bedrock and overlying sediments, the seismic noise induces resonance at frequencies that range from about 0.3 to 40 Hz. The ratio of the average horizontal-to-vertical spectrums produces a spectral-ratio curve with peaks at fundamental and higher-order resonance frequencies. The spectral ratio curve (the ratio of the averaged horizontal-to-vertical component spectrums) is used to determine the fundamental resonance frequency that can be used along with an average shear-wave velocity or a power-law regression equation to estimate sediment thickness and depth to bedrock (Lane and others, 2008; Brown and others, 2013; Fairchild and others, 2013; Chandler and others, 2014; and Johnson and Lane, 2016). he HVSR data presented in this data release were collected at each site for 30 minutes using a Tromino Model TEP-3C three-component seismometer. The data were processed with Grilla 2012 version. 6.2 software to 1) remove anthropogenic noise, 2) convert the time-domain data to frequency domain, 3) compute and plot the spectral ratio curve, and 4) determine the resonance frequency. his data release presents the resonance frequency and H to V ratios of peaks identified from the HVSR measurements. Raw and processed HVSR data for each HVSR measurement are presented in child item data sets. The HVSR data-collection sites are designated by a county sequential numbering system (BMHVSR79, DHVSR1, etc. where the prefix is a one or two letter county abbreviation, as follows: BM, Broome County; CN Chenango County; D, Delaware County; FR, Franklin; O, Orange County; RE, Rensselaer County; SA, Saratoga County).

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