Modal scattering: a key to understanding oceanic T-waves SCIE SCOPUS

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Title
Modal scattering: a key to understanding oceanic T-waves
Author(s)
Park, M; Odom, RI; Soukup, DJ
Publication Year
2001-09-01
Abstract
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.
ISSN
0094-8276
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/5854
DOI
10.1029/2001GL013472
Bibliographic Citation
GEOPHYSICAL RESEARCH LETTERS, v.28, no.17, pp.3401 - 3404, 2001
Publisher
AMER GEOPHYSICAL UNION
Type
Article
Language
English
Document Type
Article
Publisher
AMER GEOPHYSICAL UNION
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