Physics – Geophysics
Scientific paper
Sep 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.3401p&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 17, p. 3401-3404
Physics
Geophysics
17
Marine Geology And Geophysics: Marine Seismics, Oceanography: General: Ocean Acoustics, Seismology: Oceanic Crust, Seismology: Theory And Modeling
Scientific paper
The excitation mechanism of oceanic T-waves has been a puzzle for almost fifty years, with refraction from a sloping seafloor and seafloor scattering as two of the most commonly invoked mechanisms. By representing the earthquake source field as a normal mode sum, it can be seen that both mechanisms are very closely related. Strict modal orthogonality prohibits the existence of T-waves in a laterally homogeneous semi-infinite half-space or radially symmetric sphere, as energy cannot be transferred from one mode to another in an homogeneous medium. Deterministic non-planar bathymetry, random boundary roughness, upper crustal heterogeneity, or a combination of these provides a physical mechanism to break the strict orthogonality. We show that modal scattering from the rough seabottom in the epicentral region converts energy from the directly excited ocean crustal/water column modes to the propagating acoustic modes comprising the oceanic T-wave. Submarine earthquake fault orientation also appears to be reflected in the T-wave excitation.
Odom Robert I.
Park Minkyu
Soukup Darin J.
No associations
LandOfFree
Modal scattering: a key to understanding oceanic T-waves does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Modal scattering: a key to understanding oceanic T-waves, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modal scattering: a key to understanding oceanic T-waves will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1490332