ESTIMATION OF SPATIO-TEMPORAL SOURCE PARAMETERS FOR THE 1988 SPITAK, ARMENIA, EARTHQUAKE FROM BROADBAND SURFACE WAVE RECORDSB. G. Bukchin, A. L. Levshin, L. I. Ratnikova, B. Dost, and G. Nolet.
The seismic moment and source mechanism have been determined for the Spitak earthquake using long-period spectra of surface waves. Graphical presentation of the results illustrates the discriminative value of vector orientation for compression and dilatation. An analysis of surface waves in the range of shorter periods yields integral estimates for source time function duration, source geometry, and rupture propagation. We discuss the quality of these estimates.