Abstract. Landslides triggered by strong earthquakes often aj`&ca8
caused most of the global damage and most of all casualties _p*9LsN$L
related to the events, such as shown by the M = 7.7 Peru v8ap"9b
earthquake in 1970, by the M = 7.6 El Salvador earthquake ,/w*sE
in 2001 or by the M = 7.4 Khait (Tajikistan) earthquake .nD#:86M
in 1949. The obvious impact of a landslide on the population 'GJB9i+a^
is directly related to its movement. Yet, prediction of Y6v{eWtSn
future failure potential and hence future risk to population G\gjCp?!
is necessary in order to avoid further catastrophes and involves n)kbQ]
the analyses of the origin of seismic instability. The xG/Q% A
seismic landslide potential is mainly determined by the interaction mU #F>
between the regional seismic hazard and local geological ",b:rgpRp
conditions. At a local scale, seismic factors interfering '3b\d:hN
with geological conditions can produce site-specific ground wD9K\%jIr!
motions. The influence of such Site Effects on instability is ^Gk`n
the principal topic of this paper, which is divided into two 2$M nwxfk
parts, A and B. The present Part A is concerned with the correlation AT"gRCU$4
of field data with observed instability phenomena. v1:.t
Field data were obtained on mainly three landslide sites in Y*c]C ;%=
the Northern Tien Shan Mountains in Kyrgyzstan, Central BD
C DQ
Asia. Geophysical prospecting, earthquake recordings, geological %)lp]Y33
observation, trenching and geotechnical tests were 1tNL)x"w
the main investigation tools. The collected information gives iqDyE*a
an insight in the geological background of the slope failure {U=J>#@G
and allows us to roughly infer failure mechanisms from field %4*c/ c6
evidence. A detailed analysis of the susceptibility of a mechanism QXkA%'@'
to specific geological conditions will be shown in Part ~*iF`T6
B. [KK
|_
1 Introduction
