EGU General Assembly 2021
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the Creative Commons Attribution 4.0 License.

Petrinja Seismogenic Source and its 2020-2021 Earthquake Sequence (central Croatia)

Vanja Kastelic1, Simone Atzori2, Michele M. C. Carafa1, Marin Marin Govorčin3, Davorka Herak4, Marijan Herak4, Bojan Matoš5, Josip Stipčević4, and Bruno Bruno Tomljenović5
Vanja Kastelic et al.
  • 1Istituto Nazionale di Geofisica e Vulcanologia, Sismologia e Tettonofisica, L’Aquila, Italy
  • 2Istituto Nazionale di Geofisica e Vulcanologia, Oservatorio Nazionale Terremoti, Rome, Italy
  • 3University of Zagreb, Faculty of Geodesy, Department of Geomatics, Zagreb, Croatia
  • 4University of Zagreb, Faculty of Science, Department of Geophysics, Zagreb, Croatia
  • 5University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering, Department of Geology and Geological Engineering, Zagreb, Croatia

The ongoing Petrinja earthquake sequence interests a structurally complex area characterized by the transition between the Dinarides and the Pannonian Basin structural units. The sequence mainshock (December 29, 2020; Mw = 6.4) struck in the vicinity of the Petrinja town and caused significant damage in the human and in the natural environments. The preliminary seismological and geodetic analyses indicated a dextral strike-slip NW-SE oriented fault as the event source. Numerous geologic surface deformation patterns have been identified in the aftermath of the main event, including collapsed sinkholes, liquefaction, different forms of landslides, and surface fractures which nature and causative process require further detailed studies.
The aim of our contribution is to apply a multitude of different geophysical, geodetic and geologic methodologies to decipher the Petrinja seismogenic fault geometry in the light of its ongoing earthquake sequence. We will show how the different datasets converge in delineating the fault geometry and discuss their diverging aspects and implications. Our preliminary analyses on the geometric and kinematic characteristics of the mainshock (as well as those of the foreshocks and aftershocks) point to an important structural complexity. This aspect helps us to better understand the seismotectonic framework of the Petrinja seismogenic fault and other regional seismogenic faults of similar geologic and geodynamic setting.

How to cite: Kastelic, V., Atzori, S., Carafa, M. M. C., Marin Govorčin, M., Herak, D., Herak, M., Matoš, B., Stipčević, J., and Bruno Tomljenović, B.: Petrinja Seismogenic Source and its 2020-2021 Earthquake Sequence (central Croatia), EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-16585,, 2021.

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