Earthquake sources retrieved from intensities: six successes in Greece

Our source inversion technique (KF) gives an answer to an important hazard issue: the lack of knowledge of most fault-sources of earthquakes of the pre-instrumental epoch, because we retrieve the sources only from intensity. (KF was validated by comparing the sources we found with those known from instrumental measurements). Our cost function is the sum of the squared residuals (field intensities-minus-computed ones) and a genetic algorithm is used to find its minimum. Our inversions are automatic, do not use starting models nor constraints. The macroseismic patterns of 9 earthquakes of the Hellenic area were inverted, in the Marie Curie Project TOK-DEV at ITSAK, with the purpose of validating KF also in Greece. In seven cases, the found sources were close to the instrumental ones: Stivos (M6.5, 06.20.1978) and its foreshock (M5.8, 05.23.1978); Kozani (M5.5, 10.25.1984), Kalamata (M6.0, 09.13.1986), Almyros, (M6.5, 09.07.1980), Aeghio (M6.5, 06.15.1995), Sophades (M7 04.30.1954).