FN Archimer Export Format
PT J
TI Three-dimensional modeling of earthquake generated acoustic waves in the ocean in simplified configurations
BT 
AF LECOULANT, Jean
   GUENNOU, Claude
   GUILLON, Laurent
   ROYER, Jean-Yves
AS 1:1,2;2:1,2;3:3;4:1,2;
FF 1:;2:;3:;4:;
C1 Univ Brest, Lab Geosci Ocean, F-29200 Brest, France.
   CNRS, F-29200 Brest, France.
   Ecole Navale, Inst Rech, F-29200 Brest, France.
C2 UBO, FRANCE
   CNRS, FRANCE
   IRENAV, FRANCE
UM LGO
IF 1.78
TC 14
UR https://archimer.ifremer.fr/doc/00637/74914/75768.pdf
   https://archimer.ifremer.fr/doc/00637/74914/75769.pdf
LA English
DT Article
CR OHA-SIS-BIO - OBSERVATOIRE HYDROACOUSTIQUE
AB The low-frequency (4-40 Hz) acoustic waves generated by undersea earthquakes are of great importance to monitor the low-level seismic activity associated with seafloor spreading ridges. To better understand the near-source interaction of seismic waves with the seafloor and the resulting generation of low-frequency acoustic waves, the wave propagation in a solid medium (the Earth's crust) and in the overlaying fluid medium (the ocean) were jointly simulated using a three-dimensional (3D) spectral finite-element code (SPECFEM3D). Due to numerical limitations of 3D simulations, the focus was on simple model configurations with a 1 Hz source located below a Gaussian seamount or ridge. The simulated acoustic waves (0-2.5 Hz) propagate as Rayleigh modes and are affected by modal dispersion; their horizontal speed increases away from the source and reaches the sound speed about 140 km away. The amplitude of the generated acoustic waves is affected by the shape of the seafloor topography above the seismic source, as well as their travel times to hydrophones. Consequently, localization of the acoustic sources by trilateration from arrival times may be biased by 3D-effects, and thus the seismic/acoustic conversion zone may not match the epicenter. 
PY 2019
PD SEP
SO Journal Of The Acoustical Society Of America
SN 0001-4966
PU Acoustical Soc Amer Amer Inst Physics
VL 146
IS 3
UT 000489159400074
BP 2113
EP 2123
DI 10.1121/1.5126009
ID 74914
ER

EF