Abstract
Published information (l2) on the aftershocks and foreshocks of many principal shallow earthquakes occurred in the area of Greece between 1911 and 1973 constitutes a more or less homogeneous and complete sample of data in respect to some properties of these seismic sequences. These data have been used to determine certain parameters of these sequences. The value of the decay parameter p, in the time distribution law of aftershocks, is independent of the magnitude range and varies between 0.7 and 1.9 in this area. The smallest value was found for the aftershock sequence of an earthquake believed to be associated with the Kremasta artificial lake, while the largest value was found for the aftershock sequence of an earthquake occurred in the volcanic part of the Hellenic arc. The probability, N, that the largest aftershock will occur Tl days after the main shock or later is given by a relation of the form N = c — k log Tl. Representative values of the parameter b, in the frequency-magnitude relation, have been found for the foreshocks as well as for the aftershocks of the same main shocks, by a proper grouping of the data. This value is equal to 0.67 for foresliocks and equal to 0.92 for the corresponding aftershocks. The difference in magnitude between the main shock and the largest aftershock is almost independent of the magnitude of the main shock. The relation M0 — = 1.1 holds on an average.
Highlights
Research on several properties of seismic sequences has been carried out for several decades but this research has been much intensified during the last two decades
The interest of seismologists in such a kind of research is due to the fact t h a t statistical and other properties of the seismic sequences are related to several important seismological problems
The first attempt to investigate properties of the seismic sequences in Greece and the surrounding area has been made by the present author and his colleagues (°)
Summary
SUMMARY. — Published information (l2) on the aftershocks and foreshocks of m a n y principal shallow earthquakes occurred in t h e area of Greece between 1911 and 1973 constitutes a more or less homogeneous and complete sample of d a t a in respect to some properties of these seismic sequences. — Published information (l2) on the aftershocks and foreshocks of m a n y principal shallow earthquakes occurred in t h e area of Greece between 1911 and 1973 constitutes a more or less homogeneous and complete sample of d a t a in respect to some properties of these seismic sequences. These d a t a have been used to determine certain parameters of these sequences.
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