Abstract. Landslides triggered by strong earthquakes often M<m64{m1
caused most of the global damage and most of all casualties VCtiZ4
related to the events, such as shown by the M = 7.7 Peru tf7 9Gb>
earthquake in 1970, by the M = 7.6 El Salvador earthquake fw};.M
in 2001 or by the M = 7.4 Khait (Tajikistan) earthquake *B}R4Y|g
in 1949. The obvious impact of a landslide on the population sO-R+G/^7
is directly related to its movement. Yet, prediction of 3n)iT SU3
future failure potential and hence future risk to population %,q#f#
is necessary in order to avoid further catastrophes and involves C x'=2Y 7
the analyses of the origin of seismic instability. The uM<+2 S
seismic landslide potential is mainly determined by the interaction 0x/V1?gm
between the regional seismic hazard and local geological &WU*cfJn)A
conditions. At a local scale, seismic factors interfering gUtbCqDS
with geological conditions can produce site-specific ground I}A#* iD
motions. The influence of such Site Effects on instability is |OT%,QT|
the principal topic of this paper, which is divided into two eh(]'%![/
parts, A and B. The present Part A is concerned with the correlation SLB iQd.
of field data with observed instability phenomena. OHvzK8
Field data were obtained on mainly three landslide sites in z2zp c^i
the Northern Tien Shan Mountains in Kyrgyzstan, Central ` 7n, (
Asia. Geophysical prospecting, earthquake recordings, geological u"| nu!p`
observation, trenching and geotechnical tests were gbZ X'D
the main investigation tools. The collected information gives $iJ
#%&D
an insight in the geological background of the slope failure g*AqFY7 |
and allows us to roughly infer failure mechanisms from field Wf w9cxGkf
evidence. A detailed analysis of the susceptibility of a mechanism "G)?
E|
to specific geological conditions will be shown in Part e(5R8u d
B. FMr$cKvE]W
1 Introduction
