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A two‐radius circular array method: Inferring phase velocities of Love waves using microtremor records
Author(s) -
Tada Taku,
Cho Ikuo,
Shinozaki Yuzo
Publication year - 2006
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 - 10.1029/2006gl025722
Subject(s) - microtremor , phase velocity , microseism , seismogram , aliasing , geology , love wave , wavelength , rayleigh wave , phase (matter) , seismic noise , radius , geodesy , seismology , dispersion (optics) , surface wave , mode (computer interface) , seismic wave , noise (video) , normal mode , physics , acoustics , optics , wave propagation , longitudinal wave , vibration , mechanical wave , telecommunications , undersampling , computer security , quantum mechanics , artificial intelligence , computer science , image (mathematics) , operating system
We present a new method to estimate phase velocities of Love waves from horizontal‐motion seismograms of microtremors, obtained with seismic sensors placed around two circumferences of different radii, under the assumption that the fundamental mode dominates. We applied our new method to field data acquired at a test site where the shallow underground seismic velocity profile is known, and have confirmed that the phase velocities of the fundamental‐mode Love waves could be inferred with sufficient precision within certain wavelength ranges. Outside the wavelength ranges suitable for analysis, the “spectral ratio,” an intermediary quantity calculated from measurement records prior to phase velocity evaluation, deviated from theoretical expectations. The pattern of deviations could satisfactorily be accounted for by considering three factors theoretically: the presence of higher‐mode surface waves, directional aliasing related to the finite number of sensors, and the presence of incoherent noise.