Abstract. Landslides triggered by strong earthquakes often z4%uN |V
caused most of the global damage and most of all casualties yF}OfK?0f
related to the events, such as shown by the M = 7.7 Peru ))kF<A_MK
earthquake in 1970, by the M = 7.6 El Salvador earthquake _9 .(a
in 2001 or by the M = 7.4 Khait (Tajikistan) earthquake r|Z3$J{^"
in 1949. The obvious impact of a landslide on the population \W5O&G-C
is directly related to its movement. Yet, prediction of S^@S%Eg
future failure potential and hence future risk to population E51 dV:l
is necessary in order to avoid further catastrophes and involves +d}E&=p_
the analyses of the origin of seismic instability. The VZr>U*J[:
seismic landslide potential is mainly determined by the interaction `_I@i]i^
between the regional seismic hazard and local geological ]B"'}%>ez
conditions. At a local scale, seismic factors interfering z}QwP~Z
with geological conditions can produce site-specific ground "xI"
motions. The influence of such Site Effects on instability is 2"P 99$"
the principal topic of this paper, which is divided into two P9Yy9_a|x
parts, A and B. The present Part A is concerned with the correlation } "vW4
of field data with observed instability phenomena. lz#GbX n.
Field data were obtained on mainly three landslide sites in V]Om fPve
the Northern Tien Shan Mountains in Kyrgyzstan, Central u- D dq~;|
Asia. Geophysical prospecting, earthquake recordings, geological >2$5e I
observation, trenching and geotechnical tests were C
(n+SY^
the main investigation tools. The collected information gives M v 544>:
an insight in the geological background of the slope failure RoA?p;]<
and allows us to roughly infer failure mechanisms from field K;?,FlH
evidence. A detailed analysis of the susceptibility of a mechanism c .3ZXqpI;
to specific geological conditions will be shown in Part ,u }XW V
B. oBQ#eW aY
1 Introduction
