GEODYNAMIC MONITORING OF THE CRIMEAN BRIDGE AREA

A description of the integrated autonomous GPS geodynamic station in the area of the bridge across the Kerch Strait, located in the seismically active zone of the Kerch-Taman region with the maximum possible level of shaking up to 9 points, is presented. The danger to this complex engineering structure is the deep Kerch fault, the seismic activity of which was recorded in numerous historical records and data of the modern industrial period. Geodynamic aseismic movements, mud volcanism and other hazardous geological processes, which can cause damage to the bridge structure and create emergency situations at this particularly important object, are also dangerous. In 2021, in order to monitor the seismogeodynamic activity of the bridge area across the Kerch Strait, the Southern Scientific Centre of the Russian Academy of Sciences (SSC RAS) and Yuzhmorgeologiya JSC installed an autonomous satellite geodynamic station (SGS) as part of the SGS network on the Taman Peninsula. The receiving ground design of the GPS antenna device is made taking into account the recommendations of the international geodynamic service IGS and consists of a special base and a forced centering device. Measurements at the geodynamic station are performed by the GPS Trimble 5700 receiver and the MR-107 radon indicator. The operation of all SGS devices is controlled by a fanless XCY industrial computer based on the Windows 7 operating system. The electrical characteristics of the uninterruptible power supply circuit were determined by the method of UNAVCO (University NAVSTAR Consortium, USA). Measurement data are received every day via the Internet at the monitoring center of the SSC RAS. After primary processing, GPS measurements are sent for secondary processing to the geodynamic program GAMIT v. 7. The data obtained after processing contain the coordinates of the receiving antenna of the SGS with an horizontal accuracy of 2–3 mm and vertical accuracy of 6–8 mm. The secondary processing ends with the Matlab program package developed at the SSC RAS.

Crimean Bridge, geodynamic station, GPS measurements, earthquakes