678 
and to be confirmed in the field, otherwise 
it will be missleading. 
The disturbance of recent sedimentation 
processes also may indicate the acitivity of 
the mass movement, if other clues, mentioned 
in 2 & 4, exist which indicates .the exista 
nce of the movement. 
6 REPRESENTATION OF MASS MOVEMENT 
After interpretation of mass movement from 
aerial photographs and checking them in the 
field, it is neceessary to represent them on 
engineering geological maps. Different aspe 
cts of mass movement which can be seen from 
aerial photographs are represented on maps 
such as the scarp "crown area", moved mass, 
toe, scar area, ripples, cracks, saturated 
areas and potentiàll area. All these can be 
differentiated in recent and/or active, old 
and/or nonactive "still" forms, from aerial 
photographs and has to be represented by di 
fferent colours, usually red for recent and/ 
or active, black for old and/or nonactive 
"still". 
Such interpreted engineering geological ma 
ps are very important in most engineering wo 
rks, although such maps are not common all 
over the world (Pulinova et. al. 1977). De 
pending on such maps all the potential areas, 
in which movement could be triggered, has to 
be avoided as much as possible. 
Sissakian V. 1982. Applicability of aerial 
photographs and orthophotographs at various 
scale for engineering geological mapping. 
M.Sc. Thesis submited to International In 
stitute For Aerial Survey and Earth Scien 
ces (I.T.C.), Enschede The Netherlands. 
Terzaghi K. 1950. Mechanism of landslides in 
application of geology to engineering pra 
ctice (Berkey Vol.). Geol. Soc. America 
(5-7). 
Vqrnes D.J. 197b. Landslides-causes and eff 
ects. Bull. IAEG No. 14 (205-214). 
Varnes D.J., Harold T.R. & Taliang 1978. Lan- 
dslides-analysis and control. National Ac 
ademy of Sciences. Washington D.C. 
Yague A t G. 1978. Modern methods used in stu 
dy of mass movement Bull. IAEG. No. 17 
(65-71). ' 
Zaruba Q. & Mencl V. 1969. Landslides and 
their control. Czechoslovak Academy of Sc 
iences, Prague. Elsevier. 
7 CONCLUSIONS 
It is very neceessary and recommended to st 
udy aerial photographs of large scale 1:5 000 
and larger to indicate all the mass movement 
and potential areas, in which movements can 
be triggered due to any human activities. 
Because without avoiding the indicated po 
tential areas, large damages in lives and 
properties may take place, keeping in mind 
that such potential areas can net be seen or 
observed easily in the field, without using 
aerial photographs, especially those which 
are recently photographed. 
It is clear from all, above mentioned sub 
jects that all the interpreted informations, 
from aerial photographs has to be checked 
and confirmed in the field. Otherwise the 
interpreted information can not be taken in 
consideration adequately. 
REFERENCES 
Barton M.E. 1977. Landslide along bedding 
plane Bull. IAEG No. 16. 
Cotechia V. 1978. Systematic reconnaissance 
mapping & registration of slope movements. 
Bull. IAEG No. 17 (5-57). 
Gray R.E. & Gardner G.D. 1977. Process of 
colluvial slope development of McMecken, 
West Virginia. Bull IAEG No. 16 (29-32). 
Nemcok A., Pasek J. & Rybar J. (1972). Class 
ification of landslides and other movements. 
Rock mechanics Vol. 4/2 (71-78). 
Nossin J.J. 1973. Use of airphotos in stud 
ies of slope stability in Crati basin(Cala- 
bria, Italy), Geologia, Applicate e Idro 
geologia, Vo. 8, part I. 
Prandini L., Guidicini G., Bottura J.A., Po- 
cano W.L. & Santor A.R., 1977. Vegitation 
in slope stability. A critical review.'Bull, 
IAEG No. 16 (51-55). 
Schuster R.L. 1979. Reservoir induced land 
slides. Bull. IAEG No. 20 (8-15). 
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