GEODYNAMICAL HAZARDS ASSOCIATED WITH LARGE DAMS

and the global methodology for the reassessment of existing
dams developed with the French authorities in charge of the
safety regulations. Examples of seismic analyses performed
on the dams at greatest risk (arch or gravity dams) are
presented. The different levels of analyses which can be
carried out are discussed and the need for improvements and
research in this field pointed out.
COMPREHENSIVE EVALUATION OF ZEYA DAM
SEISMIC RESISTANCE Savitch A.I., Bronshtein V.I.,
Groshev M.E., Strom A.L., Doudchenko L.N.
Geodynamic Research Centre, Zeya HEP, Russia
The Zeya multipurpose hydroelectric scheme is intended for
flood control in the valleys of the Zeya River and middle
reaches of the Amour River, as well as for electric power
sup-ply to the southern regions of the Far East.
The HES consists of concrete dam, power house located at
the tow of the dam, 220 and 500 kV switchyards. The power
house contains 6 generating units with aggregate capacity of
1290 MW and generation of 4.91 TWh/year. The dam is of
gravity-buttress type with a crest length of 714 m and
maximum structural height of 115.5 m.
The Zeya hydroelectric scheme, put into service over 20
years ago, is located in a seismically hazardous area featuring
complex geology and rather poorly studied seismotectonic
framework. When working on the design, the background
regional seismicity was taken equal to intensity 6, while the
project main structures were designed for an earthquake of
intensity 7.
INDUCING EARTHQUAKES AND ENVIRONMENT:
CASE OF RESERVOIR INDUCED SEISMICITY AT
ASWAN / EGYPT
A.L Hussein, A.A. Gharib
Abstract: Some of man's engineering activities influence the
way crustal stress are released in earthquake (Induced
Earthquakes). The problem of earthquake induced by water
reservoirs has attracted considerable attention of
seismologists since the devastating earthquake of 1 979 in the
region of the Koyna big water reservoir in India (M= 6.3).