الفهرس 
GEOLOGICAL SITTING OF KALABSHA REGIONOnly 14 pages are availabe for public view
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Abstract
INTRODlJC:TJON
The relation hct\Veen the tluctuations of water level in the
reservoirs and the occurrence of earthquakes in their vicinity area is the
discussion point bet\Vccn the seismologist and geologist over the world.
where there are two opinions: one relates the seismic activity to the
tectonic movements in the area. while the other believes on induced
seismicity due to impounding the water in the artificial reservoir.
For the seismic activity around the Aswan High Dam Reservoir,
the first opinion believe that the Aswan seismicity related to the tectonic
movements from the Red Sea plat tectonic area through the extended of
Red Sea faults in the land. While the other opinion represent the Aswan
seismicity as induced case, where there is no recorded earthquakes
before the construction of the dam and artificial reservoir, wherever the
seismic activity began in the vicinity of the dam sites after the dam
established and impounding the water.
Overview of induced seismicity in the world, pointed to the
similar induced cases like in the Mead Lake area, which erected in the
upstream of Hoover Dam on the Colorado River in the United State of
America. where the tilling of this lake began in 1935. Before the filling
started, there was no historical record of earthquakes and the area was
considered as non-seismic area (Simon. 1972). from 1937 to 1939.
about I 00 earthquakes were felt in the Mead Lake area, when the lake
reached the peak load of the year. In 1939 the main shock occurred with
magnitude of 5.0. It was the first mention over the world that earthquake
occur due to impounding water level in an artificial Reservoir.
Similarly, The Kariba Reservoir. which lies in the border of ZambiaZimbabwe
in Middle of Africa. considered as one of the four reservoirs
had induced seismicity with magnitude> 6.0. It forms one of the longest
artificial reservoirs in the world. Snow ( 1974) reported that no
earthquakes occurred prior to the impoundment of the lake, however the
seismic activity from 1959 to 1962 seems to be associated with the
fluctuation of the water level in the lake. In September 1963, main
shock earthquake of magnitude 6.0 occurred when the reservoir water
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