FN Archimer Export Format
PT J
TI Modelling long-term seismic noise in various environments
BT 
AF STUTZMANN, E.
   ARDHUIN, Fabrice
   SCHIMMEL, M.
   MANGENEY, A.
   PATAU, G.
AS 1:1;2:2;3:3;4:1;5:;
FF 1:;2:PDG-ODE-LOS;3:;4:;5:;
C1 Univ Paris Diderot, Inst Phys Globe Paris, Paris, France.
   IFREMER, Lab Oceanog Spatiale, Plouzane, France.
   CSIC, Inst Earth Sci Jaume Almera, Barcelona, Spain.
C2 UNIV PARIS 07, FRANCE
   IFREMER, FRANCE
   CSIC, SPAIN
SI BREST
SE PDG-ODE-LOS
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-europe
   copubli-univ-france
IF 2.85
TC 85
UR https://archimer.ifremer.fr/doc/00107/21839/19436.pdf
LA English
DT Article
DE ;Surface waves and free oscillations;Theoretical seismology;Wave propagation
AB The strongest seismic noise, called secondary microseisms, is generated by ocean wave interactions and we model this noise using the theory of Longuet-Higgins generalized to random ocean gravity waves. Noise sources are computed with an ocean wave model that takes into account coastal reflections. Variations of the source locations are consistent with seasonal variations of seismic noise spectra. Noise spectra are modelled over many years for stations representative of various environments such as continent, island and polar area to constrain, for each environment, the parameters involved in the modelling. For each station, we quantify the trade-off between ocean wave coastal reflection and seismic wave attenuation that both affect the amplitude of the seismic spectrum. We show their adjustment and the need, at some stations, for an extra parameter representing the three-dimensional (3-D) seismic wave propagation effects. The long-term analysis demonstrates the stability of the fitted parameters which can be used in future noise studies. The modelling enables to reproduce the frequency content and amplitude of the different noise peaks of seismic spectra. The strongest peaks are generated by deep ocean sources whereas coastal reflections generate numerous smaller sources that contribute to the background noise level. Coastal reflection effects can be neglected only for the Pacific island station PPT. The modelling also reproduces the peculiar noise spectrum variation in Antarctica (station DRV) which is related to the presence of sea ice around the stations.
PY 2012
PD NOV
SO Geophysical Journal International
SN 0956-540X
PU Wiley-blackwell
VL 191
IS 2
UT 000309753800026
BP 707
EP 722
DI 10.1111/j.1365-246X.2012.05638.x
ID 21839
ER

EF