Seismotectonic characteristics of the area of Western Attica derived from the study of the September 7, 1999 Athens earthquake aftershock sequence

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Published: Jan 1, 2001
DOI: https://doi.org/10.12681/bgsg.17274
Keywords:
focal mechanisms principal parameters method eigenvalues eigenvectors Attica seismotectonic regime
N. VOULGARIS
University of Athens, Faculty of Geology, Department of Geophysics-Geothermics
M. PIRLI
University of Athens, Faculty of Geology, Department of Geophysics-Geothermics
P. PAPADIMITRIOU
University of Athens, Faculty of Geology, Department of Geophysics-Geothermics
J. KASSARAS
University of Athens, Faculty of Geology, Department of Geophysics-Geothermics
K. MAKROPOULOS
University of Athens, Faculty of Geology, Department of Geophysics-Geothermics
Abstract

A detailed analysis of the aftershock sequence of the September 7, 1999 Athens earthquake was performed in order to define the fault planes activated during this sequence and study the tectonic regime of the area. Calculated fault plane solutions were verified by the composite solutions and the application of the principal parameters method. The combined results indicate a uniform tectonic status in the western part of the aftershock area, with normal faulting of WNW-ESE trend and an average dip of 60Ί and a more complex one in the eastern part, where the azimuths of the activated fault planes vary and a transverse antithetic fault is also active. This variation could possibly imply a variation of the local stress field.

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  • Section
  • Seismology
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References
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