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# Frequency of interest
A seismic waveform can encompass integrated information from earthquakes, anthropogenic activities, and meteorological events. Filtering data based on frequencies is highly advantageous for isolating rainfall signals. Multiple studies suggest that rainfall peaks commonly fall within the frequency band of 80-100 Hz. ([Dean, 2018](https://doi.org/10.1071/ASEG2018abP068); [Bakker et al., 2022](https://doi.org/10.1016/j.jhydrol.2022.127812)).
Furthermore, it's worth noting that a geophone includes a spurious frequency of approximately 180 Hz, which could potentially contaminate seismic signals ([Faber & Maxwell, 1996](https://doi.org/10.1190/1.1826773)).
Consequently, we have concluded that implementing a bandpass frequency filter ranging from 80 to 150 Hz to our extracted seismic wave is necessary.
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