Harichandran, R. S., and Vanmarcke, E. (1986). "Stochastic variation of
earthquake ground motion in space and time." Journal of Engineering
Mechanics, ASCE, 112(2), 154-174.
Abstract
Consideration of the spatial as well as temporal variation of earthquake
ground motions may be important in the design of structures with
spatially extended foundations and lifeline systems. In this paper, the
ground motion during a specific earthquake event is conceived as the
realization of a space-time random field. Following a brief review of
pertinent results from second-order theory of random fields and a
description of spectral estimators, accelerograms recorded by the
SMART-1 seismograph array in Lotung, Taiwan are examined to determine
the frequency-dependent spatial correlation of earthquake ground
motions. A scheme for processing seismograph array data is proposed, and
similarities and differences in the motions recorded during different
events are noted. Finally, key parameters characterizing the correlation
structures are identified and a preliminary mathematical model is
suggested for the space-time correlations.