Fundamental Frequency Detection

Python code to detect the fundamental frequency in harmonic tremor, as used in the publication "Characteristics of current-induced harmonic tremor signals in ocean bottom seismometer records" by David Essing, Vera Schlindwein, Mechita C. Schmidt-Aursch, Celine Hadziioannou, Simon C. Stähler; in Seismologcal Research Letters, 2021