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According to data from the Sentinel-1 satellites, the first map of the surface changes caused by the earthquake in Croatia on Tuesday has been completed.
The displacements caused by the earthquake in Croatia and the permanent deformation of the surface were mapped by the experts of Geo-Sentinel Kft. – writes the Astronomical Portal.
Interferometric processing of observations from the Sentinel-1 aperture synthesis radar pair of satellites of the European Earth observation program Copernicus enables the detection of movements on the surface. The essence of the interferometer method is that a very detailed and accurate map of the displacement can be produced from the phase information of radar measurements in the same area before and after the earthquake.
The Sentinel-1A satellite flew over the area on December 30, the day after the disaster, in takeoff orbit (i.e., south-north). The interferometric comparison of the phase data was performed in observations made the day after the earthquake and 12 days before, on December 18. Subsequently, satellite radar measurements in the other direction of flight will allow the spatial components of the displacements to be determined more precisely.
The epicenter of the earthquake that struck at 12:19 pm CET on December 29 was about 50 km southeast of the Croatian capital, Zagreb. According to the Richter scale, seven people lost their lives as a result of the 6.3 magnitude earthquake. Severe material damage occurred in almost a hundred towns and parts of the small town of Petrinja in Croatia collapsed. The effect of the earthquake could also be felt in Hungary.
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