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Rayleigh and Love wave anisotropy in Southern California using seismic noise
Author(s) -
Riahi Nima,
Saenger Erik H.
Publication year - 2014
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 - 10.1002/2013gl058518
Subject(s) - anisotropy , rayleigh wave , seismic noise , rayleigh scattering , geology , seismology , noise (video) , surface wave , ambient noise level , microseism , range (aeronautics) , sensitivity (control systems) , seismic wave , acoustics , optics , physics , oceanography , materials science , sound (geography) , computer science , engineering , composite material , artificial intelligence , electronic engineering , image (mathematics)
We study surface wave anisotropy using three‐component frequency‐wave number analysis of 1 year (2012) of ambient seismic noise measured by the Southern California Seismic Network. Significant 2 θ and 4 θ Rayleigh wave anisotropy is observed over most of the frequency range 15 to 100 mHz (Millihertz). The wide Rayleigh wave illumination and large data volume allow for relatively high precision and sensitivity: the estimation variability above 35 mHz as well as the magnitude of the weakest significant detections is about 0.1%. The estimates are consistent with previous anisotropy studies of the region. We also show preliminary results for Love waves, but ambient Love wave illumination in Southern California may not be sufficient for the approach.