Ocean bottom seismometer (OBS) noise reduction from horizontal and vertical components using harmonic–percussive separation algorithms

Abstract. Records from ocean bottom seismometers (OBSs) are highly contaminated by noise, which is much stronger compared to data most land stations, especially on the horizontal components. As a consequence, high energy of oceanic noise at frequencies below 1 Hz considerably complicates analysis teleseismic earthquake signals recorded OBSs. Previous studies suggested different approaches remove low-frequency noises OBS recordings but mainly focused vertical component. The records components, crucial for application many methods in passive seismological body and surface waves, could not be improved frequency band. Here we introduce reduction method, derived harmonic–percussive separation algorithms used Zali et al. (2021), order separate long-lasting narrowband broadband transients signal. This leads significant both components increases signal-to-noise ratio (SNR) without distortion waveforms. demonstrated through tests with synthetic data. Both SNR cross-correlation coefficients showed improvements realistic realizations. denoised wave receiver functions discussed real