Joseph P. Vantassel, The University of Texas at Austin
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.
Currently hvsrpy is able to easily (i.e., no coding required) process miniSEED files which conform to the SEED standard. These can either be single 3-component files (i.e., all three components are in a single file) or three 1-component files. There are plans to extend this functionality to other common data formats in the near future. If you would like to see support for a particular format please read and comment on this open issue.
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.