Static stress changes due to the 1998 and 2004 Krn Mountain (Slovenia) earthquakes and implications for future seismicity

Ganas, Athanassios; Gosar, Andrej; Δρακάτος, Γ.

doi:10.5194/nhess-8-59-2008

Cited by 16 publications

(8 citation statements)

References 33 publications

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“…For contributing agencies to our earthquake catalog, see the section. Additionally, our earthquake catalog includes data from Schorn (1902), Förtsch and Schmedes (1976), Finetti et al (1979), Galadini and Galli (1999), Poli et al (2002), Ganas et al (2008), and Hammerl (2017). The catalog is available as supporting Data Set S2.…”

Section: The DI and Its Boundariesmentioning

confidence: 99%

Active Seismotectonic Deformation in Front of the Dolomites Indenter, Eastern Alps

et al. 2018

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We use earthquake focal mechanisms to study present‐day deformation and stress in the western part of the Eastern European Alps. We define the following regions, based on seismicity and kinematically compatible focal mechanism types: (1) the northern and western parts of the Dolomites indenter, the western and central Tauern Window, and the northern Alpine margin and foreland lack significant seismicity. (2) The indenter boundaries are characterized by strike‐slip faulting. Based on earthquake and geodetic data, the western and northern indenter boundaries are active sinistral and dextral strike‐slip/oblique slip faults. (3) West and north of the indenter corner, we observe normal and strike‐slip faulting in an up to 70 km‐wide zone. From west to east, the minimum horizontal stress rotates clockwise about 10–20°, from NE to ENE. (4) North of (3), east of the Swiss/Austrian border, we find evidence for N to NNW directed thrust faulting, and local orogen‐parallel extension. From our results and geodetic data, we infer that relative to a fixed northern foreland, NNW directed indentation is transferred at depth via the Sub‐Tauern thrust system to this 100‐km‐wide zone of localized thrusting. A lack of evidence for major, active strike‐slip faulting north of the Tauern Window is in line with geodetic data, which show no significant velocity difference between the northern part of the Eastern Alps and their foreland.

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Section: The DI and Its Boundariesmentioning

confidence: 99%

Active Seismotectonic Deformation in Front of the Dolomites Indenter, Eastern Alps

et al. 2018

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“…Two independent studies of Coulomb static stress changes were performed for the 1998 and 2004 earthquakes. In the first study (Ganas et al, 2008) they show that stress levels have increased along the active Ravne fault for all considered models, stress levels have decreased along the parallel (NW-SE) Idrija fault, stress levels in the crust have increased along the E-W direction, but have decreased in the N-S direction, because of stress shadow effect. A better correlation of the off-fault aftershock locations with stress maps incorporating the regional stress field was also obtained (Ganas et al, 2008).…”

Section: Investigations Of Stress Changes On Neighbouring Faultsmentioning

confidence: 93%

Review of seismological investigations related to 1998 Mw5.6 and 2004 Mw5.2 earthquakes in Krn Mountains

Gosar¹

2019

Geologija

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Overview of extensive seismological studies of Krn Mountains earthquakes performed in two decades is given. Detailed macroseismic studies by using a new European Macroseismic Scale EMS-98 showed large variations in damage to buildings due to the influence of very heterogeneous sediments and partly also due to the differences in source radiation pattern. Site effects were carefully studied and it was proven by microtremor HVSR method that soil-structure resonance effects severely enhanced the damage in many places. Particularly important were seismotectonic studies based mainly on focal mechanisms and distribution of aftershocks. Combined with geological data these studies pointed to the complex structure of segmented Ravne fault, which is growing by interactions between individual fault segments. A wider area is characterised by a kinematic transition between Dinaric (NW-SE) strike-slip faults in W Slovenia and E-W trending Alpine structures with predominantly reverse faulting in Friuli. Other investigations included static stress changes on neighbouring faults, analyses of the time decay of extensive aftershock sequences and magnitude-frequency relations. All these studies have significantly fostered seismological research in Slovenia and have enhanced international cooperation. Following the 1998 earthquake a modern national seismological network was built composed of 26 stations equipped with broadband sensors, accelerometers and high-resolution digitizers. Together with cross-border exchange of real-time data the seismological monitoring has been significantly improved. Izvleček Podan je pregled obsežnih seizmoloških raziskav, ki so v dveh desetletjih sledile potresoma v Krnskem pogorju. Podrobne makroseizmične raziskave z uporabo nove Evropske potresne lestvice EMS-98 so pokazale velike razlike v poškodovanosti stavb zaradi vpliva zelo heterogenih sedimentov in deloma tudi zaradi sevalne funkcije posameznih potresov. Vplivi mehkih sedimentov so bili natančno raziskani, z uporabo metode spektralnih razmerij mikrotremorjev je bilo mogoče dokazati velik vpliv resonančnih učinkov med sedimenti in stavbami, ki so ponekod bistveno povečali škodo zaradi potresa. Posebno pomembne so bile seizmotektonske študije, ki so temeljile predvsem na žariščnih mehanizmih potresov in prostorski porazdelitvi popotresov. Skupaj z geološkimi podatki so razkrile zapleteno strukturo segmentiranega Ravenskega preloma, ki raste z interakcijo med posameznimi segmenti preloma. Za širše območje je značilen kinematični prehod med zmičnimi prelomi Dinarske smeri (NW-SE) v zahodni Sloveniji in Alpsko usmerjenimi (E-W) strukturami v Furlaniji s prevladujočim reverznim prelamljanjem. Druge raziskave so vključevale tudi analizo statičnega prenosa napetosti na sosednje prelome, analize časovnega poteka obsežnih popotresnih nizov in odnosa med magnitudo in frekvenco potresov. Vse te študije so pomembno spodbudile razvoj seizmologije v Sloveniji in razmahnile mednarodno sodelovanje. Po potresu leta 1998 je bila zgrajena moderna seizmološka mreža,...

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“…in the fault zone, the change in the Coulomb Stress Change, ∆CFSs, on the target failure plane is represented as [16] n With the corresponding position of the rupture plane, the ∆CFS on the receiver plane can be computed. By the physical phenomena, an increasing Coulomb stress means a loading, pushing the fault toward brittle failure.…”

Section: Methodology and Data Analysismentioning

confidence: 99%

Using Coulomb Stress Changes and Seismic Spectrum Intensities Evaluation of the Seismic Hazard Potential of Meishan Earthquake in Central Taiwan

Liao¹,

Xie²,

Hsieh³

2021

cea

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Static stress changes due to the 1998 and 2004 Krn Mountain (Slovenia) earthquakes and implications for future seismicity

Cited by 16 publications

References 33 publications

Active Seismotectonic Deformation in Front of the Dolomites Indenter, Eastern Alps

Active Seismotectonic Deformation in Front of the Dolomites Indenter, Eastern Alps

Review of seismological investigations related to 1998 Mw5.6 and 2004 Mw5.2 earthquakes in Krn Mountains

Using Coulomb Stress Changes and Seismic Spectrum Intensities Evaluation of the Seismic Hazard Potential of Meishan Earthquake in Central Taiwan

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