engleski

Quick use of satellite and GI technologies after earthquake - Petrinja 29.12.2020.

On December 29th, 2020, the wider area of Banija was hit by a strong earthquake with a strength of 6.2 on the Richter scale with an epicenter near town of Petrinja. The quake, which was also felt outside Croatia's borders, caused the deaths of seven people and major devastation. Thousands of buildings were destroyed and become unusable, as well as significant parts of the utility infrastructure. Also, visible traces of soil movement were observed. Before and after the main quake, the epicentral area was hit by many aftershocks, several of them with magnitude higher than 4.5 on the Richter scale. Before that, on March 22nd, 2020, town of Zagreb was also hit by a strong earthquake with the strength of 5.5 on the Richter scale. Already after Zagreb earthquake a great need for spatial interpretation of the event and its aftermath has been recognized. Therefore, after the earthquake in Petrinja, a quick reaction of geodetic experts followed, using modern satellite and geoinformation (GI) technologies to provide information on the aftermath of the earthquake. In a few days GIS applications have been developed for delivery of help to endangered citizens and to record damages, as well as information on the earthquake scattering and ground movements in the epicenter area. Synergy of different methods and fast reaction, i.e. quality information and applications in great helped the organization of crisis management, information to services and citizens, registration of damages and reconstruction planning. This paper presents an overview of the systems, sensors and data used, their processing and the results obtained, i.e., the applications developed for crisis management purposes are presented. The results of soil displacement obtained using the data of permanent GNSS stations processed by the authors of this paper are particularly emphasized, showing that in Sisak there was a horizontal displacement of about 5.5 cm and a shrug of about 2 cm.

earthquakes, satellite and GI technologies, GIS applications, ground movement

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