FN Archimer Export Format
PT J
TI Polarized Earth's ambient microseismic noise
BT 
AF SCHIMMEL, M.
   STUTZMANN, E.
   ARDHUIN, Fabrice
   GALLART, J.
AS 1:1;2:2;3:3;4:1;
FF 1:;2:;3:PDG-ODE-LOS;4:;
C1 CSIC, Inst Earth Sci Jaume Almera, E-08028 Barcelona, Spain
   Inst Phys Globe, CNRS, PRES Sorbonne Paris Cite, UMR 7154, F-75005 Paris, France
   IFREMER, Lab Oceanog Spatiale, F-29280 Plouzane, France
C2 CSIC, SPAIN
   IPGP, FRANCE
   IFREMER, FRANCE
SI BREST
SE PDG-ODE-LOS
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-europe
IF 3.021
TC 73
UR https://archimer.ifremer.fr/doc/00041/15219/12713.pdf
LA English
DT Article
DE ;microseismic noise;polarization;primary and secondary microseisms;seismology
AB We quantify, analyze, and characterize the frequency-dependent microseismic noise recorded by worldwide distributed seismic stations. Microseismic noise is generated through the interaction of ocean waves. It is the strongest ambient noise, and it is observed everywhere on Earth. We introduce a new approach which permits us to detect polarized signals in the time-frequency domain and which we use to characterize the microseismic noise. We analyze 7 years of continuous seismograms from the global GEOSCOPE network. Microseisms are dominated by Rayleigh waves, and we therefore focus on elliptically polarized signals. The polarized signals are detected in the time-frequency domain through a degree of polarization measure. We design polarization spectra and show that microseismic noise is more strongly polarized than noise in other frequency bands. This property is used to measure the directions of the polarized noise at individual stations as a function of time and frequency. Seasonal variations are found for the back azimuths and for the number of polarized signals at many stations. We show that the back azimuth directions are robust measurements that point toward the source areas computed from ocean wave models.
PY 2011
PD JUN
SO Geochemistry Geophysics Geosystems
SN 1525-2027
PU Amer Geophysical Union
VL 12
IS Q07014
UT 000293094400004
DI 10.1029/2011GC003661
ID 15219
ER

EF