With introduction of GPS, measurement techniques changed. 
The Figure 1 shows the location of measurements performed so 
far. Some networks were measured only by classical means, 
some with GPS-technology. It is important to stress that for the 
future use, all data should be put together in a common format 
to be used in the future as the starting point for regular 
measurement campaigns. 
2.2 Geodesy and geodynamics in Croatia 
Croatia has several zones of strong seismic activity: along the 
coast, especially in the regions around Dubrovnik and Rijeka, 
and Mount Medvednica in proximity of Croatian capitol Zagreb 
(Figure 2). 
  
  
  
  
  
  
  
  
  
Figure 2: Earthquakes in Croatia, Slovenia and Bosnia and 
Herzegovina. 
  
  
  
  
  
Geodynamic Network of the City of Zagreb with 
major faults in the area. 
Figure 3: 
The efforts of geodesists to establish the detailed picture of 
tectonic movements in Croatia started with the GPS-usage in 
1994. Croatia actively participated in establishing European 
reference frame project (EUREF), and together with Slovenia 
organized large geodynamical project called CRODYN. 
256 
Measurements on a large number of points on the Adriatic coast 
were repeated in 1996 and 1998. In that manner, a lot of 
valuable data was acquired and interdisciplinary analyses were 
made possible. For evaluation of results of first two campaigns, 
see (Altiner 1999) 
In addition to CRODYN, in 1997, the first series of precise 
GPS- measurements were conducted on 40 points of 
Geodynamic Network of the City of Zagreb (Fig. 3). 
Monuments with excellent stabilization represent the best 
geodynamic network in central Europe. In 2001 the campaign 
has been repeated and re-processed with usage of GAMIT 
scientific GPS-processing software from Massachusetts Institute 
of Technology - an open source product. The results were 
excellent other disciplines recognized the geodesy as an 
important data provider for their research (Medak and 
Pribicevic, 20012). 
2.3 Future trends - CERGOP-2 
The first phase of Central Europe Regional Geodynamics 
Project officially lasted from 1995 to 1998, supported by EU 
Copernicus Programme (Reinhardt and Becker 1998). The 
second phase (CERGOP-2) finally passed as Fifth framework 
programme project in 2003. The full name of the project is "A 
Multipurpose and  Interdisciplinary Sensor Array for 
Environmental Research in Central Europe". One of the goals of 
the project is to provide a reliable 3D tectonic velocity field 
covering the Central European Region and integrate it into 
hierarchically higher level (i.e. global) tectonic models. The 
CEGRN campaigns are performed on a yearly basis from 1994 
onwards and a lot of data is collected. 
The area of great importance is the National park Plitvice 
Lakes, UNESCO World Heritage, which is proclaimed as 
international geodynamic test area and taken as special study 
area within CERGOP project (Medak and Pribicevi¢, 2001b; 
Pribicevi¢ and Medak, 2001). 
3. SPATIO-TEMPORAL DATABASE OF TECTONIC 
MOVEMENTS : 
Repeated satellite measurements within the projects like 
Croatian. geodynamic network (CRODYN), Central Europe 
Regional Geodynamics Project (CERGOP), Geodynamic 
network of the City of Zagreb and several local geodynamical 
projects in Slovenia yielded a huge amount of observations and 
derived results. Especially CERGOP has integrated a 
considerable part of geodynamic research in Central Europe. 
Thus, a need for a reliable on-line service providing all kinds of 
data one could use for scientific research should be established. 
The importance of such information system was recognized by 
international geodetic institutions such as IAG (Beutler et al. 
2003). IAG formed IGGOS, which stands for Integrated Global 
Geodetic Observing System. System should be understood as 
the basis on which the future advances in geosciences can be 
built. By considering the Earth system as a whole (including 
solid Earth, atmosphere, ocean, hydrosphere, ice, liquid 
core...), monitoring it by geodetic techniques and by studying it 
from the geodetic point of view, the geodetic community can 
provide the global geosciences community with a powerful tool 
consisting mainly of high quality services, standards and 
references, and theoretical and observational innovations. The 
IAG community wants to implement IGGOS as its first priority 
for the next future (Beutler et al. 2003). 
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