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ADCP observations of edge waves off Oahu in the wake of the November 2006 Kuril Islands tsunami
Author(s) -
Bricker Jeremy D.,
Munger Sophie,
Pequignet Christine,
Wells Judith R.,
Pawlak Geno,
Cheung Kwok Fai
Publication year - 2007
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2007gl032015
Subject(s) - geology , shore , submarine pipeline , seismology , enhanced data rates for gsm evolution , geodesy , geophysics , oceanography , telecommunications , computer science
During the 2006 Kuril Islands tsunami, edge waves propagating along Oahu's south shore were observed via depth‐averaged ADCP velocity and pressure data acquired in real‐time by a coastal observatory at 12 m depth and 400 m offshore. Time‐varying rotary‐component velocity spectra obtained via wavelet analysis agree with the phase lag observed between pressure and each Cartesian velocity component, in indicating the directions of rotation and travel of progressive edge waves. Furthermore, the theoretical ratios between power in the free surface elevation and in each velocity component of edge waves, agree with those observed, and a nonlinear shallow‐water model shows edge waves of various modes propagating along the shore near our observation location. Importantly, the maximum surge in sea level occurred at a time when edge waves of all constituent frequencies were superposed.