The Fault that Caused the Athens September 1999 Ms=5.9 Earthquake: Field Observations

S.B. Pavlides (), G. Papadopoulos and A. Ganas

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2002, vol. 27, issue 1, 84 pages

Abstract: On 7 September 1999 the Athens Metropolitan area (Greece) was hit by a moderate size (Ms=5.9) earthquake. The severely damaged area is localized in the northwestern suburbs of the city, at the foothills of Mt. Parnitha (38.1°N, 23.6°E), about 18 km from the historic centre of Athens. In this paper, we present our results on the surface expression of the seismogenic structure. Methods applied were: field observations, geological mapping, fault geometry and kinematics, evaluation of macroseismic data, interpretation of LANDSAT images, construction of a DEM and application of shading techniques. Aftershock distribution and fault plane solutions were also considered. Our results suggest that the earthquake source is located within the NW-SE trending valley bearing a few outcrops of Neogene-Quaternary sediments across the south foothills of Mt. Parnitha, never known in the past to have been activated by such strong earthquakes. The earthquake occurred along a 10 km long normal fault, striking N110°–133° and dipping 64°–85°SW, extending from the Fili Fort (4th century BC) in the NNW to the Fili town and then to Ano Liossia, to the SSE. Tensional stress field with σ 3 axis almost horizontal striking NNE-NE prevails in the area. The fault strike and the extensional direction (σ 3 ) are compatible with the focal mechanism of the main shock. Copyright Kluwer Academic Publishers 2002

Date: 2002
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DOI: 10.1023/A:1019927302304

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