The Galaxidi earthquake of 18 November 1992: A possible asperity within the normal fault system of the Gulf of Corinth (Greece)

Abstract

The Galaxidi earthquake that occurred in the Gulf of Corinth on 18 November 1992 was not followed by a noticeable aftershock sequence, a fact that was also observed for the 1965 Eratini event in the same area. The temporary network of 35 stations that we installed 5 days after the mainshock did not help to identify a cluster of activity related to the mainshock. In a section across the epicentral zone, the focal mechanism of the mainshock and the distribution of a few aftershocks define a plane dipping north, consistent with the nearby Helike fault. We propose that the Galaxidi earthquake was related to an asperity located between the Helike and Xilokastro faults.