Ground motion Fourier and response spectra from Utah earthquakes, 2010--2020

Records from strong motion stations were downloaded from FDSN and CESMD data centers with a search radius of approximately 220 km from Salt Lake City. Waveforms were processed to deconvolve instrument response and for baseline corrections. Signal was separated from noise using an automated P-wave picker. The signal was then windowed to include the mean plus two standard deviations of the signal. After windowing, the signal-to-noise ratio (SNR) was calculated by transforming both signal and noise into the frequency domain to be smoothed using the Konno-Ohmachi method with the bandwidth parameter set to 189.0. Highpass and lowpass filters were applied by dynamically selecting corner frequencies where the passband SNR exceeded 3.0. Quality assurance tests were done to identify data that did not have SNR greater than 3.0 from 0.2Hz to 5.0Hz or did not meet the minimum sampling rate requirement of 20Hz. Pseudospectral Accelerations (SA) and Fourier Amplitude Spectra (FAS) were calculated for periods of 0.01s, 0.02s, 0.03s, 0.05s, 0.075s, 0.1s, 0.15s, 0.2s, 0.25s, 0.3s, 0.4s, 0.5s, 0.75s, 1.0s, 1.5s, 2.0s, 3.0s, 4.0s, 5.0s, 7.5s, and 10.0s.