It is demonstrated that routine computer relocations of early epicentres in Iran seldom result in new positions which are much more reliable than the original ISS locations. This is because the early arrival data are generally of such poor accuracy and azimuthal distribution that the epicentre can be resolved only to the average limits given by the input data; the resolution of focal depth is even worse. It appears that the only reliable method for improving or confirming early instrumental epicentres in areas such as Iran is to attempt to find correlations with macroseismic data.
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N. N. Ambraseys (1978) studied this question.
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