Abstract
The quality of GNSS data is very significant for determining the locations and kinematic structures of the station points. Therefore, the quality of the measurements needs to be high as well as the geological stratigraphy and the continuity of tectonic mechanism in subsurface of the point where the GNSS station is built should be investigated in detail. For this purpose in this study, the geophysical studies realized in the GNSS station are presented for interpreting the kinematic origin of the results of GNSS measurements which were obtained in Izmir (Turkey). In this scope, the GNSS data processing results and gravity changes were evaluated of the GNSS station wherein obtained GNSS and microgravity data for 3 years. In the results of 3 years measurements, it was pointed out that this GNSS station presented different movements relative to other GNSS stations. Therefore, it is requested to investigate whether the tectonic mechanism or the soil causes these differences. In this way, the soil dynamic analysis was realized by using the S velocity and density values obtained from the multichannel analysis of surface waves (MASW) method and gravity measurements realized in the GNSS station and its surrounding. Consequently, it is pointed out that the soil of GNSS station wherein seismically active region is also affected by the active environment. Therefore, all physical conditions needs to be taken account while interpreting the tectonic features of the findings obtained from this type of GNSS station.
Highlights
The campaign GNSS measurements were realized in The Scientific and Technological Research Council of Turkey (TUBITAK) Project (No:108Y285) for monitoring the stress increases, velocity changes and horizontal motions in the blocks which controlled the tectonism of Izmir and its surrounding (Figure 1)
It is needed to be analyzed the features such as the location, the degree of dissociation and discontinuities conditions of early Miocene Kocadağ volcanites which overlay the DEU5 GNSS station region and the interpretations should be done on the profiles by controlling the geological findings with geophysical data (MASW and gravity) and the profiles should be prepared in larger scales
The soil of GNSS station is affected by these effects due to the years
Summary
The campaign GNSS measurements were realized in The Scientific and Technological Research Council of Turkey (TUBITAK) Project (No:108Y285) for monitoring the stress increases, velocity changes and horizontal motions in the blocks which controlled the tectonism of Izmir and its surrounding (Figure 1). In the detailed field observation, it was found that there was a basin which holds water in the western side as well as there were geothermal natural hot water outlets in the southern fault block of this station point. In this study, the detailed geophysical studies were realized for investigating the kinematic mechanism of the dissimilarities of DEU5 and clarifying its soil behaviour. In this scope, MASW and gravity measurements were obtained in DEU5 and its surrounding. The geological structure features of DEU5 were investigated in detail
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