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
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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.
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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
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Tectonic history & Pliocene-Quaternary faulting
Seismicity
Seismogenic zones: seismicity & tectonics
STRUCTURE OF THIS LECTURE:
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ALPS
CARPATHIANS
DINARIDES
PANNONIANBASIN
ADRIATIC BASIN
Tectonic position: at the “triple junction” between the Alps, Dinarides & Pannonian basin
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Mesozoic - Paleogene tectonic history:a part of the suture between European and Adriatic plates
after Schmid et al. (2008)
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)
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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
• Local basin inversion: compression by folding & reverse faulting (ca. 5 Ma to Recent)
after Tomljenović & Csontos (2001)
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Traces of Pliocene-Quaternary active faults
7after Herak et al. (subm.)
Seismicity of NW Croatia
8after Herak et al. (subm.)
Fault-plane solutions in NW Croatia
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Seismogenic zones of NW Croatia
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Seismogenic zone 1: Ivanščica-Kalnik
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Seismogenic zone 2: Bilogora-Drava
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Seismogenic zone 3: Medvednica - Zagreb area
after Tomljenović (2002)
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NorthMedvednica
Fault KašinaFault
SavaFault
Medvednica - Zagreb area: Base Pliocene structural map
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Seismogenic zone 3: Medvednica-Zagreb
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Seismogenic zone 3: Medvednica-Zagreb
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Seismogenic zone 4: Žumberak - Samoborsko gorje
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Seismogenic zone 5: Pokupje
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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;
Conclusions:
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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;
Conclusions:
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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;
Conclusions:
NorthMedvednica
Fault KašinaFault
SavaFault
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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 !!!