Updating the Coordinates of the Cadastral Sites After the Earthquake: Example of the 20.07.2017 Bodrum-Kos Earthquake

Abstract

In this study, the coordinate changes of the benchmarks and survey marks after the 20.07.2017 (MW:6.6) Bodrum-Kos earthquake were calculated. Post-earthquake GNSS measurements were collected on five continuously operating reference stations and eight benchmarks in the region. By comparing the obtained coordinates with the ones before the earthquake, the deformation occurred in the geodetic infrastructure was determined and the deformation maps were created. To control the resulting deformation maps, the real-time GNSS measurements were made at the total of 44 benchmarks and survey marks with 300-epoch using CORS-TR network. These measurements showed that the deformations calculated in the western part of the Bodrum peninsula are consistent with the deformation maps produced. The deformation in the eastern part of Bodrum peninsula is not in line with the maps produced, and therefore geodetic infrastructure renovation works can be carried out in these areas.