■wiw
characteristic as outlined for the second stage, assisted interpreter
for discriminating these lava flows from the dam lake. Whitish areas
in the northern part of lake which indicate the presence of accu
mulations of very recent sediments is another criteria for discrimi
nations. Most of the craters of the youngest stage are visible in
Landsat images.
According to radiometric data, this lava is about 25.000 years
old (Ercan et al 1985).
Mapping of the volcanic rocks on Landsat imagery shows approxi
mately the same accuracy as from 1: 35.000 scale aerial photog
raphs of the area.
Metamorphic rocks appears with distinctive morphological impress-
sion which is determined by watersheds and drainage patterns. Ru
ggedness of the unit is much apperant in Band 7.
Soft Neogene formations are mostly seen in whitish tones and
could be mapped by the help of Band 5, and colour composite
image. White tones represent bare slopes consisting of sandy silty,
tuffaous materials which reflect much of the electromagnetic
energy in dry season.
Limestone plateaus which have been formed in Neogene basin
rocks are also distinct terrain features, occur in the north of first
stage basalts. They are easily detectable units with flat topography,
faint signs of internal drainage and site characteristics. These terrain
features have been isolated by scarp zone which is transferred to
badlands.
Badlands occur in the areas where soft Neogene deposits are
capped by limestone or basalt plateous. They appears as stronly dis
sected fine textural drainage network in Landsat imagery. Narrow
straight ravines cause the relief impression. Badland boundries were
not mapped but typical areas were indicated.
The boundry between Neogene soft formations and Quaternary
deposits of Gediz Graben is very clear in Band 5, and especially in
colour composite image. Graben buttom appears in darker tones in
Band 5 and bright red in colour composite, which reflects parcels
of various crops and orchards and makes a distinct contrast with
the white Neogene sediments.
Capital letter M in Band 7, points faint meandering belts of Gediz
River.
2.1 Analysis of lineaments
The following linear features have been analysed on the Landsat
image:
Certain faults; distinct on Landsat imagery and proved by earlier
researches in the field.
Possible faults; clear on Landsat imagery as distinct lineaments
and have been decided possible faults in the field.
Faults; derived from the rows of craters and cones which are vi
sible in Landsat.
Most of the faults can be seen on Landsat images clearly. In add
ition, synoptic view advantage of Landsat imagery has created
fruitful conclusions for the tectonics of the area. It can easily be
recognized that the oldest andesitic eruptions occured in the north
ern part, while relatively younger three basaltic eruptions took
place in the middle and southern part of Landsat image. Even these
three basaltic stages have been arranged in rows which are conti
nuously shift towards south.
According to the rows of cones, the first stage basaltic lavas have
been erupted from roughly E—W trending faults or cracks. The
mam
... *.
■ -
/
f a . , ,1 - , i
M'
’«*,*■*
■ , *• >*
VH-
i* 1 .
' '
Figure 2. M.S.S. Landsat Band 5
5? »*■
". ^. ■ 4-
SSÈ#
¡y ;VU
■yy.. Vt
'( ■ . r-2'
• ft ’
Figure 3. M.S.S. Landsat Band 7
rows of the second stage craters which are situated south of first
stage, imply that they came to the surface by WNW—ESE and
SW—NE trending faults an cracks. The youngest lavas also erupted
by the same trending weak zones as happened in the second stage,
but shifts south, relative to second stage.
At the upper most south of image,a young depression can be seen.
This NW— SE trending graben is recent active formation of south
shifting tectonic activity. In the light of such tectonic pattern, one
can understand that further tectonic studies and earthquake re
searches have to be targeted at the southern part of the area.
654
Graben Buttom
Figure 4. Lam
r»
\
Köprüb
/a
1/2
Figure 5. Land
REFERENCES
Beekman, H.P.
MTA report,.
Bergo, G. 1964
Bircan, A. et a
Gen<j Tektoni
Canet, J. and
Aydin-Kula-
