title: T-wave generation and propagation: a comparison between data and spectral element modeling.
abstract: T-waves are underwater acoustic waves generated by earthquakes. Modeling of their generation and propagation is a challenging problem. Using a spectral element code-SPECFEM2D, this paper presents the first realistic simulations of T-waves taking into account major aspects of this phenomenon: The radiation pattern of the source, the propagation of seismic waves in the crust, the seismic to acoustic conversion on a non-planar seafloor, and the propagation of acoustic waves in the water column. The simulated signals are compared with data from the mid-Atlantic Ridge recorded by an array of hydrophones. The crust/water interface is defined by the seafloor bathymetry. Different combinations of water sound-speed profiles and sub-seafloor seismic velocities, and frequency content of the source are tested. The relative amplitudes, main arrival-times, and durations of simulated T-phases are in good agreement with the observed data; differences in the spectrograms and early arrivals are likely due to too simplistic source signals and environmental model. These examples demonstrate the abilities of the SPECFEM2D code for modeling earthquake generated T-waves.
authors.affiliation: Université de Brest, Laboratoire Domaines Océaniques (UMR6538), Institut Universitaire Européen de la Mer, Place Nicolas Copernic, 29280 Plouzané, France.
authors.forename: Guillaume
authors.initials: G
authors.lastname: Jamet
authors.forename: Claude
authors.initials: C
authors.lastname: Guennou
authors.forename: Laurent
authors.initials: L
authors.lastname: Guillon
authors.forename: Camille
authors.initials: C
authors.lastname: Mazoyer
authors.forename: Jean-Yves
authors.initials: JY
authors.lastname: Royer
mesh_terms: D000162:Acoustics / Q000295:instrumentation; D003198:Computer Simulation; D055866:Earthquakes; D004867:Equipment Design; D008962:Models, Theoretical; D009038:Motion; D009716:Numerical Analysis, Computer-Assisted; D009791:Oceanography / Q000295:instrumentation / Q000379:methods*; D009792:Oceans and Seas; D015203:Reproducibility of Results; D012623:Seawater; D012815:Signal Processing, Computer-Assisted; D013016:Sound; D013018:Sound Spectrography; D013997:Time Factors; D014159:Transducers