Open AccessHigher Modes of Seismic Surface Waves—Relations to Channel Waves
Author(s) -
Bãth Markus,
Crampin Stuart
Publication year - 1965
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1965.tb03889.x
Subject(s) - rayleigh wave , dispersion (optics) , love wave , amplitude , mechanical wave , surface wave , longitudinal wave , channel (broadcasting) , wave propagation , physics , geology , dispersion relation , dispersive body waves , mechanics , optics , telecommunications , computer science
Summary Measurements of the amplitude at every crest of the higher mode wave trains give “dynamic dispersion curves” which show the higher modes having increases of amplitude at the velocities of the channel waves. These increases are not associated with maxima or minima of the corresponding group velocity dispersion curves. Most observations of higher modes at Uppsala are of the second Rayleigh mode which show channel waves in their dynamic dispersion, although when other modes are present they also show channel waves. The channel waves of the second Rayleigh mode have retrograde elliptic motion whereas previous observations of channel waves have found them to have predominantly transverse horizontal motion.