Abstract
Abstract. Strain analysis is one of the methods for the kinematic analysis of the repeated geodetic measurements. In order to derive strain accumulation in Marmara Region, different institutions carried out several Global Positioning System (GPS) campaigns in 1999 and 2006. The GPS campaigns were performed on the geodetic network which cover the provinces: Kirklareli, Tekirdag, Bursa, Bilecik and Adapazari. Then, the displacements of the network stations were estimated by means of analysing the GPS space geodetic measurements. For the assessment of the datum differences between 1999 and 2006 on the station coordinates, 3-D Helmert transformation was applied to the coordinates of each 1999 and 2006 datum. Then, a global test was introduced to determine the significant deformation which occurred in the geodetic GPS network. Strain accumulation with a finite element model was then computed. First, triangles were constructed for the whole network with the Delaunay method. Hereafter, strain parameters were calculated for each triangle. Maximum values of strain accumulation were found around the surroundings of Marmara Ereglisi and Izmit, whereas minimum values are around Istanbul.
Highlights
After the Izmit and Duzce earthquakes (1999), renovations of Turkish National Fundamental Global Positioning System (GPS) Network (TNFGN) and Turkish National Vertical Control Network (TNVCN) were done (TNFGN Report, 2001)
Several GPS campaigns were performed on this network and analysed between 15 July and 30 October 2006 by three different companies namely TOPCON, TRIMBLE, and LEICA in order to test the performance of the GPS receivers (CORS-TR, 2006)
This study aimed to compare the coordinate differences between the adjusted coordinates obtained from GPS observations in 1999 and the average of the adjusted coordinates obtained from the GPS observations by the aforementioned three companies in 2006 and to compute strain accumulation of the corresponding area by finite element model
Summary
Istanbul Metropolitan Municipality, General Command of Mapping (GCM), General Directorate of Land Registry and Cadastre, and the Scientific and Technical Research Council of Turkey (TUBITAK) – Marmara Research Center (MRC) in Kirklareli, Tekirdag, Bursa, Bilecik and Adapazari. Istanbul GPS Triangulation Network (IGTN) and Marmara Earthquake Region Land Information System (MERLIS) were formed covering this region (IGTN Report, 1999; MERLIS Report, 2006). GPS campaigns were performed and analysed at different times by different institutions. A test network was formed from a subset of the network stations of Turkish Continuously Operating Reference Stations (CORS-TR). Several GPS campaigns were performed on this network and analysed between 15 July and 30 October 2006 by three different companies namely TOPCON, TRIMBLE, and LEICA in order to test the performance of the GPS receivers (CORS-TR, 2006). This study aimed to compare the coordinate differences between the adjusted coordinates obtained from GPS observations in 1999 (converted to 2000.45 epochs) and the average of the adjusted coordinates obtained from the GPS observations by the aforementioned three companies in 2006 (converted to 2006.60 epochs) and to compute strain accumulation of the corresponding area by finite element model
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