EGU21-16598, updated on 09 Jan 2024
EGU General Assembly 2021
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Coseismic surface "conjugate" faulting of the 29 December 2020., MW 6.4, Petrinja earthquake (Sisak-Moslavina, Croatia)

Emanuele Tondi1, Anna Maria Blumetti2, Mišo Čičak3, Pio Di Manna2, Zoran Đuroković3, Paolo Galli4, Chiara Invernizzi1, Stefano Mazzoli1, Luigi Piccardi5, Giorgio Valentini1, Eutizio Vittori5, and Tiziano Volatili1
Emanuele Tondi et al.
  • 1Scuola di Scienze e Tecnologie, Sezione di Geologia, Università di Camerino, Italy
  • 2Istituto Superiore per la Protezione e la Ricerca Ambientale – ISPRA, Roma, Italy
  • 3Water Management Department for Middle and Lower Sava Flood Protection Service, Croatian Waters
  • 4Dipartimento Protezione Civile, Roma, Italy
  • 5Istituto di Geoscienze e Georisorse, Consiglio Nazionale delle Ricerche, Firenze, Italy

We provide here a first-hand description of the coseismic surface effects caused by the Mw 6.4 Petrinja earthquake that hit central Croatia on 29 December 2020. This was one of the strongest seismic events that occurred in Croatia in the last two centuries. Field surveys in the epicentral area allowed us to observe and map primary coseismic effects, including geometry and kinematics of surface faulting, as well as secondary effects, such as liquefaction, sinkholes and landslides. The resulting dataset consists of homogeneous georeferenced records identifying 222 observation points, each of which contains a minimum of 5 to a maximum of 14 numeric and string fields of relevant information. The earthquake caused surface faulting defining a typical ‘conjugate’ fault pattern characterized by Y and X shears, tension cracks (T fractures), and compression structures (P shears) within a ca. 10 km wide, right-lateral strike-slip fault zone (i.e. the Petrinja Fault Zone, PFZ). We believe that the results of the field survey provide fundamental information to improve the interpretation of seismological, GPS and InSAR data of this earthquake. Moreover, the data related to the surface faulting may impact future studies focused on earthquake processes in active strike-slip settings, integrating the estimates of slip amount and distribution in assessing the hazard associated with capable transcurrent faults.

How to cite: Tondi, E., Blumetti, A. M., Čičak, M., Di Manna, P., Đuroković, Z., Galli, P., Invernizzi, C., Mazzoli, S., Piccardi, L., Valentini, G., Vittori, E., and Volatili, T.: Coseismic surface "conjugate" faulting of the 29 December 2020., MW 6.4, Petrinja earthquake (Sisak-Moslavina, Croatia), EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-16598,, 2021.


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