Joseph P. Vantassel
I am interested in learning more about the horizontal-to-vertical spectral ratio method. What resources would you recommend?
An excellent starting reference for HVSR method is the SESAME Guidelines (SESAME 2004). The guidelines thoroughly documents field acquisition, processing, and interpretation of HVSR data. The citation is below:
SESAME. (2004). Guidelines for the Implementation of the H/V Spectral Ratio Technique on Ambient Vibrations Measurements, Processing, and Interpretation. European Commission - Research General Directorate, 62.
The effect of the processing settings will vary on a case-by-case basis. Some simple examples showing how the processing settings affect a single time window are shown in the README. For most sites the default/recommended settings (as detailed in the Jupyter notebook) should be sufficient. Refer to the literature including Cox et al. (2020) and the SESAME Guidelines (2004) specifically for more information.
With the release of v2.0.0, hvsrpy support a broad range of microtremor and earthquake data formats including: miniSEED, SAF, MiniShark, SAC, GCF, and PEER.
In general, good quality ambient noise data (i.e., the sensor was allowed to record undisturbed for the full record length) does not need to be pre-processed, and can be used directly. However, hvsrpy offers an extensive set of preprocessing settings that can be used including: sensor rotation, time domain filtering, demean/detrend, and windowing.