the colour composites, while some parts were made on digital pro- 
cessing images. The images used were obtained by the satellites 
Landsat-1 and Landsat-2 in different times and in different orbites 
which made possible an analysis of the area on stereo model. The 
intention of such an analysis was to obtain more geomorphological- 
tectonic elements and to evaluate their practical value. 
Numerous geomorphological and tectonic data have been 
registered among which a great number has not been known before. 
The faults and faulty zones and morphological elements of ring form 
are the most important identified data. 
The registered data on the Landsat images were compared 
to the selected geological - geophysical data obtained by terres- 
trial explorations. The comparation was done in order to find out 
a possible relation between them. It was made by means of the data 
on seismic activity geothermal occurences and ore layers. 
EXPLORATION OF SEISMIC ACTIVITY 
In the north-western part of Balkan peninsula the seis- 
mic activity was presented by the earthquake epicentres. Conside- 
red were all stronger earthquakes magnitude M = 4,0, and Io= VII 
MSC respectively covering the period of 1801 to 1900 and rather re- 
liable historic data about destructive earthquakes, intensity 
Io & VIII and IX” MSC respectively for a period 361 to 1800. The 
general characteristic of extent arrangement of seismic activities 
18 a rather pronounced concentration of earthquake epicentres in 
the coastal part of the Adriatic and partially in its submarine 
part. Going to the interior the number of earthquake epicentres is 
rapidly reduced until the Pannonian basin edges, where it is being 
increased again. Going to the Alpes the seismic activity increases 
too. 
The localities with the most frequent and the strongest 
earthquakes are shown in the table 1 along with their basic data. 
The concentration of earthquake epicentres in particular 
areas forms the zones of the increased seismic activity, which ha- 
ve a definite extending direction. At the Adriatic coast, from 
Ilirska Bistrica ove Rijeka to Senj, then around Zadar and from 
Sing over Imotski to Albania there is a zone with a greater frequ- 
ency of earhtquakes (Fig 1). In this area we have the strongest 
earthquakes, magnitude M about 7, intensity up to X° MSC scale (es- 
pecially between Dubrovnik and Uleing). 
The zones with more pronounced seismic activity may be 
also distinguished in the interior part. That is Baranja - Dilj go- 
ra - Banja Luka the area of Zumberak - Zagreb and the surroundings 
of Ljubljana. The maximum earthquake magnitudes SM) in these areas 
are about 6,5, and earthquake intensity up to IX" MSC. 
The focus depth of earthquakes probably doesn’t exceed 
the level of Moho discontinuity. The most frequent are between 10 
and 20 km, and the biggest depths are in the south areas from Zag- 
reb (38 km), surrounding of Zadar (40 km) and the south Adriatic 
(about 45 km). 
568 
  
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