Physics
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pepi...38..162n&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 38, Issue 2-3, p. 162-173.
Physics
1
Scientific paper
Spatial coherence of digitally recorded acceleration time histories across five elements of the El Centro Differential Array recorded during the October 15, 1979 Imperial Valley, California, earthquake is studied. Recorded within a total spacing of 214 m, the three-component time histories at five stations of this linear array provide a unique set of free-field data at sites of similar geology in the near field of a strong earthquake. The observed peak ground accelerations vary by as much as 43, 13 and 40% on the E-W, N-S and vertical components. It is shown that the incoherence of high frequency waves brought about by wave scattering near the receiver is partially responsible for the observed variation. This is evident from the frequency dependent reduction of the peak cross-correlation amplitudes of the strong phase of ground shaking. The observed reductions increase from ~ 1% below 1 Hz to 20-30% in the 1-10 Hz band and to nearly 80% above 10 Hz. Investigation of the polarization angle of P-wave coda indicates that high frequency waves (> 10 Hz) approach the recording station randomly from nearly all directions. The peak cross-correlation of the polarization angle in general is lower than that of amplitudes. The successive sampling of this angle in the low frequency band suggest a northwestward propagation of the source during the faulting process.
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