A new study that was conducted by Croatian and Hungarian researchers and was based on the 6.4 magnitude earthquake that shocked Petrinja, Croatia in December 2020 showed major horizontal and vertical displacements. It should be noted that the earthquake affected several nearby countries except from Croatia since it was very strong causing excessive damage to the country. The latter is the reason that researchers decided to estimate the displacements and have a more valuable insight into the regional geodynamic of the country.
Previous studies have already tried to estimate the displacements that occurred by Petrinja earthquake. However, the researchers now have a cast of unpublished geodetic data that they can reconstruct three-dimensional movements. With the aid of InSAR data from the Copernicus Sentinel-1 mission, along with data from 300 re-occupied GNSS stations of low-order trigonometric and GNSS networks, the scientist concluded that the horizontal displacements at the area of the epicenter were up to 40cm while the vertical displacements were up to 20cm.
In all, it is mentioned that Croatia had nearly 140 years, since 1880, before facing another strong earthquake. Researchers revealed that GPS stations measure between the two earthquakes 2-4mm horizontal displacements per year. This finding demonstrates the activity of the tectonic plates in the region, while they have reached the conclusion that the displacements in the Petrinja-Zagreb region are taking place when strong seismic events occur.
Sources: scitechdaily.com, link.springer.com, phys.org
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