FN Archimer Export Format
PT J
TI Ocean wave sources of seismic noise
BT 
AF ARDHUIN, Fabrice
   STUTZMANN, Eleonore
   SCHIMMEL, Martin
   MANGENEY, Anne
AS 1:1;2:2;3:3;4:2;
FF 1:PDG-ODE-LOS;2:;3:;4:;
C1 Inst Francais Rech Exploitat Mer, Ctr Brest, Lab Oceanog Spatiale, F-29280 Plouzane, France Univ Paris 07, Inst Phys Globe Paris, Dept Sismol, F-75005 Paris, France
   Univ Paris 07, Inst Phys Globe Paris, Dept Sismol, F-75005 Paris, France
   CSIC, Inst Earth Sci Jaume Almera, Dept Struct & Dynam Earth, E-08028 Barcelona, Spain
C2 IFREMER, FRANCE
   UNIV PARIS 07, FRANCE
   CSIC, SPAIN
SI BREST
SE PDG-ODE-LOS
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-europe
   copubli-univ-france
IF 3.021
TC 204
UR https://archimer.ifremer.fr/doc/00044/15531/12926.pdf
LA English
DT Article
AB Noise with periods 3 to 10 s, ubiquitous in seismic records, is expected to be mostly generated by pairs of ocean wave trains of opposing propagation directions with half the seismic frequency. Here we present the first comprehensive numerical model of microseismic generation by random ocean waves, including ocean wave reflections. Synthetic and observed seismic spectra are well correlated (r > 0.85). On the basis of the model results, noise generation events can be clustered in three broad classes: wind waves with a broad directional spectrum (class I), sea states with a significant contribution of coastal reflections (class II), and the interaction of two independent wave systems (class III). At seismic stations close to western coasts, noise generated by class II sources generally dominates, but it is intermittently outshined by the intense class III sources, limiting the reliability of seismic data as a proxy for storm climates. The modeled seismic noise critically depends on the damping of seismic waves. At some mid-ocean island stations, low seismic damping is necessary to reproduce the observed high level and smoothness of noise time series that result from a spatial integration of sources over thousands of kilometers. In contrast, some coastal stations are only sensitive to noise within a few hundreds of kilometers. This revelation of noise source patterns worldwide provides a wealth of information for seismic studies, wave climate applications, and new constraints on the possible directional distribution of wave energy.
PY 2011
PD SEP
SO Journal of Geophysical Research ( JGR ) - Oceans
SN 0148-0227
PU American Geophysical Union
VL 116
IS C09004
UT 000294804000002
DI 10.1029/2011JC006952
ID 15531
ER

EF