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    Aftershock sequences of some large earthquakes in the region of Greece

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    Deformation characteristics, magnitude and time distribution<br />of the aftershocks of the large earthquakes, occurred in the region<br />of Greece from 1926 till 1964 are investigated. An approximate relation<br />between the number of aftershocks and the magnitude and focal depth<br />of the main shock has been found. Also, an approximate relation has been<br />derived between the magnitude of the largest aftershock and the magnitude<br />and focal depth of the main sliok. The largest aftershock occurs within<br />fourteen days after the main shock. In many cases large " late aftershocks "<br />occur one or more months after the main shock. One or more foreshocks<br />of magnitude larger than 3.5 occurred in forty per cent of the cases. The probability for an earthquake to be preceded l>y a large foreshoek not much<br />smaller than the main shock is 10%. It is shown that some properties of<br />the Earth's material in the aftershock region can be derived by studying the<br />magnitude distribution and deformation characteristics of the aftershocks
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