Seismo-acoustic signatures of crashing ocean waves (surf)

Résumé fourni par la source

Surf infrasound has been recorded for decades on a variety of global seismo-acoustic networks and is a well-known noise source primarily in the band 0.5–5 Hz. We conducted a series of field experiments designed to study seismo-acoustic surf signals in Santa Barbara, California. Our data included one continuously running infrasound sensor (COPR, September 2022 to July 2023) and several short-duration (∼1–6 days) field campaigns involving multiple infrasound arrays, co-located seismometers, and time-synchronized video recordings (Francoeur et al. 2025). Our results demonstrate that seismo-acoustic signals from surf are composed of repetitive transient events, which can be detected and characterized using template matching. We record the repetitive surf infrasound waveforms at COPR throughout varied oceanographic and atmospheric conditions over the course of the ∼11 month deployment; the amplitudes of detected infrasound signals correlate with offshore significant wave height and local wind speed. Here we present an overview of the observations (Francoeur et al. 2025) and compare strategies for source localization of the surf infrasound transients. Francoeur, J.W., R.S. Matoza, H.D. Ortiz, R. De Negri (2025), Identification of transient seismo-acoustic signals from crashing ocean waves: Template matching and location of discrete surf events, Geophys. J. Int., 243, 2, ggaf317, doi:10.1093/gji/ggaf317.

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