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Seismogenic zones of NW Croatia

Seismogenic zones of NW Croatia. Bruno TOMLJENOVIĆ 1 , Davorka HERAK 2 , Marijan HERAK 2 & Koraljka KRALJ 3. 1 University of Zagreb, Faculty of Mining, Geology & Petroleum Engineering, Pierottijeva 6, Zagreb

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Seismogenic zones of NW Croatia

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  1. Seismogenic zones of NW Croatia Bruno TOMLJENOVIĆ 1, Davorka HERAK 2, Marijan HERAK 2 & Koraljka KRALJ 3 1 University of Zagreb, Faculty of Mining, Geology & Petroleum Engineering, Pierottijeva 6, Zagreb 2 University of Zagreb, Faculty of Sciences, Department of Geophysics, Horvatovac bb, Zagreb 3 INA Oil Company d.d. Zagreb, Exploration Department, Šubićeva 29

  2. STRUCTURE OF THIS LECTURE: • Tectonic history & Pliocene-Quaternary faulting • Seismicity • Seismogenic zones: seismicity & tectonics

  3. Tectonic position: at the “triple junction” between the Alps, Dinarides & Pannonian basin CARPATHIANS ALPS PANNONIANBASIN ADRIATIC BASIN DINARIDES

  4. Mesozoic - Paleogene tectonic history:a part of the suture between European and Adriatic plates Sharp deviation from overall NW-SE into NE-SW trend of Internal Dinarides is due to CCW-rotation and tectonic escape during the Oligocene- Earliest Miocene (Tomljenović et al., 2008) after Schmid et al. (2008)

  5. Neogene-recent tectonic history: a part of the Pannonian b. • Syn-rift phase: extension by normal faulting(ca. 20 – 15 Ma) – opening of numerous sub-basins • Post-rift phase: regional thermal subsidence (ca. 15 – 5 Ma) without significant faulting • Local basin inversion: compression by folding & reverse faulting (ca. 5 Ma to Recent) after Tomljenović & Csontos (2001)

  6. Traces of Pliocene-Quaternary active faults

  7. Seismicity of NW Croatia after Herak et al. (subm.)

  8. Fault-plane solutions in NW Croatia after Herak et al. (subm.)

  9. 1 2 4 3 5 Seismogenic zones of NW Croatia

  10. Seismogenic zone 1: Ivanščica-Kalnik

  11. Seismogenic zone 2: Bilogora-Drava

  12. Seismogenic zone 3: Medvednica - Zagreb area after Tomljenović (2002)

  13. NorthMedvednicaFault KašinaFault SavaFault Medvednica - Zagreb area: Base Pliocene structural map

  14. Seismogenic zone 3: Medvednica-Zagreb

  15. Seismogenic zone 3: Medvednica-Zagreb

  16. Seismogenic zone 4: Žumberak - Samoborsko gorje

  17. Seismogenic zone 5: Pokupje

  18. 1 2 4 3 5 Conclusions: • In general, there is a good correlation betweena) location and kinematics of Pliocene-Quaternary active faults, b) concentration of earthquakes and c) calculated and available FPS-s;

  19. 1 2 4 3 5 Conclusions: • However, attribution of seismic events to particular faults is still highly tentative and asks for a more precise data base, both on faults and hypocentres;

  20. NorthMedvednicaFault KašinaFault SavaFault Conclusions: • Zagreb area, which is considered as the most vulnerable part of NW Croatia, is located within a tectonic block bounded by the three Pliocene-Quaternary active faults;

  21. Conclusions: • There is a positive correlation between earthquake focii, FPS data, location and kinematics of the North Medvednica, Kašina and Sava faults; • These faults are considered as the major seismogenic sources in Medvednica - Zagreb seismogenic zone, responsible for historic earthquakes and capable to generate future events with M = 6 !!!

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