Abstract. Landslides triggered by strong earthquakes often b 5NPG N
caused most of the global damage and most of all casualties v y&q7EX<i
related to the events, such as shown by the M = 7.7 Peru y(!J8( yA
earthquake in 1970, by the M = 7.6 El Salvador earthquake
:.u[^_
in 2001 or by the M = 7.4 Khait (Tajikistan) earthquake anxZ|DE
in 1949. The obvious impact of a landslide on the population t|XQ Fb@}
is directly related to its movement. Yet, prediction of pH!e<m
future failure potential and hence future risk to population 0@cc XF E
is necessary in order to avoid further catastrophes and involves ]w*w@:Zk
the analyses of the origin of seismic instability. The w&VM b&<
seismic landslide potential is mainly determined by the interaction ti%uyXfja
between the regional seismic hazard and local geological O{@m , uY
conditions. At a local scale, seismic factors interfering C5k\RS9
with geological conditions can produce site-specific ground l.gt+e
motions. The influence of such Site Effects on instability is Tp-<!^o4
the principal topic of this paper, which is divided into two lyZ[t P S
parts, A and B. The present Part A is concerned with the correlation $w%n\t>B
of field data with observed instability phenomena. TX/Ng+v S
Field data were obtained on mainly three landslide sites in |1M+FBT$w
the Northern Tien Shan Mountains in Kyrgyzstan, Central J)yNp,V
Asia. Geophysical prospecting, earthquake recordings, geological =\u QGH
observation, trenching and geotechnical tests were O Z,%T9vP
the main investigation tools. The collected information gives )}`3haG
an insight in the geological background of the slope failure `GGACH3# s
and allows us to roughly infer failure mechanisms from field N i\*<:_
evidence. A detailed analysis of the susceptibility of a mechanism {t qLH2cO
to specific geological conditions will be shown in Part (rDB|kc^7
B. 6< E4?<O%
1 Introduction
