FN Archimer Export Format PT J TI Modelling secondary microseismic noise by normal mode summation BT AF GUALTIERI, L. STUTZMANN, E. CAPDEVILLE, Y. ARDHUIN, Fabrice SCHIMMEL, M. MANGENEY, A. MORELLI, A. AS 1:1,2;2:1;3:3;4:4;5:5;6:6;7:7; FF 1:;2:;3:;4:PDG-ODE-LOS;5:;6:;7:; C1 CNRS, IPGP, UMR 7154, F-75005 Paris, France. Univ Bologna, Dipartimento Fis & Astron, Settore Geofis, Bologna, Italy. CNRS, Lab Planetol & Geodynam Nantes, Nantes, France. IFREMER, Lab Oceanog Spatiale, Brest, France. CSIC, Inst Earth Sci Jaume Almera, Barcelona, Spain. Univ Paris Diderot, Inst Phys Globe Paris, UMR 7154, CNRS, F-75005 Paris, France. INGV, Bologna, Italy. C2 CNRS, FRANCE UNIV BOLOGNA, ITALY UNIV NANTES, FRANCE IFREMER, FRANCE CSIC, SPAIN UNIV PARIS 07, FRANCE INGV, ITALY SI BREST SE PDG-ODE-LOS IN WOS Ifremer jusqu'en 2018 copubli-france copubli-europe copubli-univ-france IF 2.724 TC 66 UR https://archimer.ifremer.fr/doc/00146/25703/24020.pdf LA English DT Article DE ;Surface waves and free oscillations;Seismic attenuation;Theoretical seismology;Wave propagation AB Secondary microseisms recorded by seismic stations are generated in the ocean by the interaction of ocean gravity waves. We present here the theory for modelling secondary microseismic noise by normal mode summation. We show that the noise sources can be modelled by vertical forces and how to derive them from a realistic ocean wave model. We then show how to compute bathymetry excitation effect in a realistic earth model by using normal modes and a comparison with Longuet-Higgins approach. The strongest excitation areas in the oceans depends on the bathymetry and period and are different for each seismic mode. Seismic noise is then modelled by normal mode summation considering varying bathymetry. We derive an attenuation model that enables to fit well the vertical component spectra whatever the station location. We show that the fundamental mode of Rayleigh waves is the dominant signal in seismic noise. There is a discrepancy between real and synthetic spectra on the horizontal components that enables to estimate the amount of Love waves for which a different source mechanism is needed. Finally, we investigate noise generated in all the oceans around Africa and show that most of noise recorded in Algeria (TAM station) is generated in the Northern Atlantic and that there is a seasonal variability of the contribution of each ocean and sea. PY 2013 PD JUL SO Geophysical Journal International SN 0956-540X PU Oxford Univ Press VL 193 IS 3 UT 000319482100045 BP 1732 EP 1745 DI 10.1093/gji/ggt090 ID 25703 ER EF