Physics
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.3429p&link_type=abstract
Geophysical Research Letters, Volume 27, Issue 20, p. 3429-3432
Physics
1
Seismology: Earthquake Ground Motions And Engineering
Scientific paper
A new/modified technique for the separation of source, path and site effects from strong motion records is proposed. To do this we made two extensions of the method developed in [Iwata and Irikura, 1988]. (1) We allow the Q-value to be variable with depth and subregion in a block model of the medium with constant Q in each block. Path lengths within blocks are calculated using ray approximation. (2) To estimate the absolute site effect at reference station (and source effects respectively) we can use the H/V spectral ratio method for the S-wave group to determine the spectral correction at the reference station. Our new method was applied to a set of KNET data in the Tohoku area of Japan. Preliminary results of Q structure inversion show that Q has minor variations with depth, and slightly decreases in the deepest layer. Source effects clearly show the existence of fmax phenomena (fmax=13Hz).
Irikura Kojiro
Petukhin Anatoly
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