January 1, 2021 – our expert Branimir Radun, certified engineer of geodesy and geoinformatics and head of our Department of Natural Resources Management, made the final analysis of ground displacement in areas affected by devastating earthquakes.
After detailed processing and interferometric analysis of SAR images of the Sentinel-1 system, we created a map of ground displacements that occurred as a result of a series of devastating earthquakes that hit the area of Petrinja, Sisak and Glina. The map does not show strictly vertical ground displacements, but the difference in spatial distance between the recorded objects and satellites along the line-of-sight (LOS), which can be considered a combination of vertical and horizontal displacements.
The biggest ground displacements occurred in the area of the town of Petrinja, with a “collapse” of as much as 30 centimeters. While the western part of the fault has a ground uplift of approximately 40 cm. The largest displacement occurred in the forest area surrounded by the towns of Slana, Glinska Poljana and Gora.
In the area of the towns of Sisak and Glina, occurred displacements of up to 3 cm, which at first glance is negligible compared to those in the area of Petrinja, but even such displacements can cause major damage to facilities and infrastructure.
Let us recall the Zagreb earthquake that occurred in March 2020 when similar smaller displacements occurred, but we could all see how it affected Zagreb.
We will be happy to share our results with all interested institutions and invite seismologists to cooperate and further analyze earthquakes using remote sensing.