Study shows the scale of displacement by the December 2020 Petrinja earthquake

Location of the study area and coverage of Sentinel-1 SAR data in the Petrinja region. Credit: Remote Sensing (2024). doi: 10.3390/rs16122112

The December 2020 earthquake near the Croatian city of Petrinja (magnitude 6.4) was felt throughout Croatia and in many places in neighboring countries, and caused severe damage at the site. A recent Croatian-Hungarian collaboration analyzed the horizontal and vertical displacements caused by the earthquake and placed them within a regional geodynamic interpretation.

Displacements caused by the Petrinja earthquake have already been estimated in several previous works. The new results are methodologically novel in that they use an unprecedented amount of geodetic data to reconstruct 3D movements. In addition to InSAR data (from the Copernicus Sentinel-1 mission), data from three hundred GNSS stations were processed to reoccupy triangle grids and lower order GNSS grids.

The results that appeared in remote sensing showed that the size of the horizontal displacements in the epicenter of the earthquake reached 40 centimeters in some places, and a maximum of 20 centimeters in the vertical direction.

The last earthquake of this magnitude in the region occurred in Zagreb in 1880. In the 140 years between the two earthquakes, the horizontal displacement of the region today, measured by Global Positioning System (GPS) stations, amounted to 2-4 mm per year – a local manifestation . of tectonic plates – would cause displacement on the same order as the displacement observed in the recent earthquake.

This indicates that displacements caused by global tectonics and plate movements in the Petrinja Zagreb area are mostly achieved through single events, or earthquakes, rather than continuous movement.

This is important information not only for Croatia when assessing earthquake safety, but also for neighboring regions.

More information: Marko Bavasović et al., Largest Geodetic Cosmetic Evaluation of the 2020 MW=6.4 Petrinja Earthquake, (2024). doi: 10.3390/rs16122112

Provided by Eötvös Loránd University

Citation: Study shows scale of displacement by December 2020. Petrinja Earthquake (2024, June 24) Retrieved June 24, 2024 from https://phys.org/news/2024-06-magnitude-displacements-december-petrinja-earthquake.html

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