2024-03-28T18:24:36Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1308462020-08-11T11:00:27Zcom_10261_82com_10261_8col_10261_461
DIGITAL.CSIC
author
Beucler, E.
author
Mocquet, A.
author
Schimmel, Martin
author
Chevrot, S.
author
Vergne, Jérôme
author
Sylvander, Matthieu
2016-04-07T10:26:34Z
2016-04-07T10:26:34Z
2015-12-14
AGU Fall Meeting 2015 , San Francisco 14-18 december, 2015 , S31C-06
http://hdl.handle.net/10261/130846
The ocean activity produces continuous and ubiquitous seismic energy mostly in the 2-20 s period band, also known as microseismic noise. The secondary microseisms (2-10 s period) 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. Since both type of secondary microseisms (coastal or deep-ocean) can occur simultaneously at different places and are continuously evolving in terms of frequency, it is very difficult to discriminate them usgin seismic stations 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 secondary microseismic peak. Comparison with swell spectra at surrounding buoys suggests that the largest part of this extra energy comes from deep-ocean-generated microseisms. Focusing on two different storms which occurred in the North Atlantic Ocean, we show that both deep-ocean and coastal microseisms coexist.
eng
closedAccess
Discrimination of Secondary Microseism Origins Using Ocean Tide Modulation
comunicación de congreso
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URL
https://digital.csic.es/bitstream/10261/130846/1/accesoRestringido.pdf
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accesoRestringido.pdf
URL
https://digital.csic.es/bitstream/10261/130846/5/accesoRestringido.pdf.txt
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accesoRestringido.pdf.txt