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Seismicity of the Lake Aswan area, Egypt, between 1991-1999

Hassoup A., Hasseb G., Dahy S.

Acta Geophysica Polonica

2002

Vol. 50, nr 3

361-372

The data described here form a part of continuous observations of the earthquake activity and water level variation in Lake Aswan area in Egypt. The earthquake hypocenters from the 1991-1999 period are distributed in four seismic zones (A, B, C and D), trending in the E-W and N-S directions. The hypocenters concentrate within the shallow part of the crust. The number of deeper events, with focal depths between 10 and 30 km, is small. The temporal distribution of seismicity in the 1991-1999 period correlates with water level changes in the lake. This well observed correlation indicates that the water level variation is effective in the Lake Aswam area, and suggests that the 1991-1999 earthquake activity may be classified as reservoir-triggered seismicity. The composite fault plane solution is considered for the earthquakes of magnitude greater than 2. Nine solution were obtained, representing the four epicentral zones. The strike-slip and strike-slip with normal component focal mechanism are dominant in the study area. This result is consistent with the interpretation of tectonics in the Aswan region. The focal mechanism with normal component is found only in zone C. This observation may be related to an effect produced either from the change in water load due to the water level variation or from tectonic characteristics of zone C.