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Article Dans Une Revue Geophysical Research Letters Année : 2015

Observation of deep water microseisms in the North Atlantic Ocean using tide modulations

Résumé

Key Points: • Tide modulations of the microseismic energy are observed at shoreline stations • Coastal and open-sea microseismic sources coexist in different frequency ranges • Most of the 2–5 s period microseisms on the Atlantic coast come from deep ocean Abstract Ocean activity produces continuous and ubiquitous seismic energy mostly in the 2–20 s period band, known as microseismic noise. Between 2 and 10 s period, secondary microseisms (SM) are generated by swell reflections close to the shores and/or by opposing swells in the deep ocean. However, unique conditions are required in order for surface waves generated by deep-ocean microseisms to be observed on land. By comparing short-duration power spectral densities at both Atlantic shoreline and inland seismic stations, we show that ocean tides strongly modulate the seismic energy in a wide period band except between 2.5 and 5 s. This tidal proxy reveals the existence of an ex situ short-period contribution of the SM peak. Comparison with swell spectra at surrounding buoys suggests that the largest part of this extra energy comes from deep ocean-generated microseisms. The energy modulation might be also used in numerical models of microseismic generation to constrain coastal reflection coefficients.
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Dates et versions

hal-01277085 , version 1 (04-01-2022)

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Éric Beucler, A. Mocquet, Martin Schimmel, Sébastien Chevrot, Olivier Quillard, et al.. Observation of deep water microseisms in the North Atlantic Ocean using tide modulations. Geophysical Research Letters, 2015, ⟨10.1002/2014GL062347⟩. ⟨hal-01277085⟩
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