The eartquake of 12 April 1998 in the Krn Mountains (upper Soča valley, Slovenia) and its seismotectonic characteristics

Zupančič, Polona; Cecić, Ina; Gosar, Andrej; Placer, Ladislav; Poljak, Marijan; Živčić, Mladen

doi:10.5474/geologija.2001.012

Cited by 34 publications

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“…Recent activity of dextral strike-slip fault systems is documented by large right-lateral offset of geological and geomorphological features (e.g., Mlakar, 1969;Cunningham et al, 2006Cunningham et al, , 2007Moulin et al, 2014Moulin et al, , 2016 and by the formation of pullapart basins (Vrabec, 1994;Kastelic et al, 2008). Seismicity also reflects dextral strike-slip deformation, with major earthquakes having transcurrent focal plane solutions (e.g., Poljak et al, 2010), such as the 12 April 1998 (M w 5.66) (Bajc et al, 2001;Zupancîč et al, 2001;Bernardis et al, 2000) and 12 July 2004 (M w 5.1) earthquakes, related to the Ravne strike-slip fault (Kastelic et al, 2008). Quaternary activity of the eastern Southern Alps front is documented by field evidence and seismic lines interpretation (e.g., Zanferrari et al, 1982Zanferrari et al, , 2008aZanferrari et al, , b, 2013Galadini et al, 2005;Poli et al, 2008Poli et al, , 2009Monegato and Poli, 2015), which defined ongoing growth of anticlines on blind active thrusts.…”

Section: Tectonic Setting and Seismic Activitymentioning

confidence: 99%

First evidence of active transpressive surface faulting at the front of the eastern Southern Alps, northeastern Italy: insight on the 1511 earthquake seismotectonics

et al. 2018

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Abstract. We investigated the eastern corner of northeastern Italy, where a system of NW–SE-trending dextral strike-slip faults of western Slovenia intersects the south-verging fold and thrust belt of the eastern Southern Alps. The area suffered the largest earthquakes of the region, among which are the 1511 (Mw 6.3) event and the two major shocks of the 1976 seismic sequence, with Mw = 6.4 and 6.1. The Colle Villano thrust and the Borgo Faris–Cividale strike-slip fault have been here first analyzed by interpreting industrial seismic lines and then by performing morphotectonic and paleoseismological analyses. These different datasets indicate that the two structures define an active, coherent transpressive fault system that was activated twice in the past two millennia, with the last event occurring around the 15th–17th century. The chronological information and the location of the investigated fault system suggest its activation during the 1511 earthquake.

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Section: Tectonic Setting and Seismic Activitymentioning

confidence: 99%

First evidence of active transpressive surface faulting at the front of the eastern Southern Alps, northeastern Italy: insight on the 1511 earthquake seismotectonics

et al. 2018

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“…During PSInSAR monitoring, a major earthquake with a magnitude of MW = 5.6 occurred in the central part of the research area [2,9,10]. Fig.…”

Section: Coseismic Surface Displacements As a Consequence Of The "Easmentioning

confidence: 99%

“…The broader area is characterized by medium seismic activity [1]. During the InSAR data acquisition, between April 1992 and December 2000, a major earthquake occurred in the research area with a magnitude of MW = 5.6 [2,9,10].…”

Section: Introductionmentioning

confidence: 99%

“…Tectonic activity is defined by the stress filed with principal stress axis (σ 1 ) oriented approximately in N-S direction [3,[5][6][7]. Several major active right lateral strike-slip faults dissect the area (Idrija, Sava and Ravne fault) along with the South Alpine thrust [2,8,9] and the thrusts of the secondary order (Julian nappe, Tolmin nappe, Trnovo nappe; after [5]). The broader area is characterized by medium seismic activity [1].…”

Section: Introductionmentioning

confidence: 99%

“…This is especially true for the north-western part of Slovenia where the research area was chosen due to its known neotectonic activity [1][2][3] and numerous landslides, rockfall and debris flow occurrences [4]. Tectonic activity is defined by the stress filed with principal stress axis (σ 1 ) oriented approximately in N-S direction [3,[5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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Discrimination of mass movement in Alpine Slovenia using PSInSAR data

Komac

Bavec

2009

WIT Transactions on Ecology and the Environment

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Using a relatively new method called the PSInSAR (Permanent Scatterer Interferometry) technique, mass movements in an area that spreads over 700 km 2 and lies in the Julian Alps and the foreland (north-western Slovenia) were assessed. The research area forms the eastern flank of the Alpine arch and is tectonically still active. For analytical purposes 57 images of descending orbit from satellites ERS 1 and ERS 2 were used. The time span of the acquired images was from April 1992 to December 2000. The average signal reflector (PS) density for the area was 23/km 2 . Altogether 16,304 permanent scatters were detected. A time series of displacements was acquired for the best 10% (1,646 PS). The results show a constant uplift of the Southern Alps and indicate that the uplift is of a higher magnitude than had been considered until now -in some cases almost five times higher. The relative uplift in relation to the reference point in the Alpine foreland ranges up to 3.35 mm per year. An uplift of this magnitude is clearly related to processes of active tectonics including coseismic phenomena. Tectonic subsidence on the other hand is difficult, or in some cases impossible to discriminate from landslides and other processes of mass wasting.

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Microtremor Soil-Structure Resonance Study in the Bovec Basin (NW Slovenia) Related to 1998 and 2004 Damaging Earthquakes

Gosar

Increasing Seismic Safety by Combining Engineering Technologies and Seismological Data

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The eartquake of 12 April 1998 in the Krn Mountains (upper Soča valley, Slovenia) and its seismotectonic characteristics

Cited by 34 publications

References 0 publications

First evidence of active transpressive surface faulting at the front of the eastern Southern Alps, northeastern Italy: insight on the 1511 earthquake seismotectonics

First evidence of active transpressive surface faulting at the front of the eastern Southern Alps, northeastern Italy: insight on the 1511 earthquake seismotectonics

Discrimination of mass movement in Alpine Slovenia using PSInSAR data

Microtremor Soil-Structure Resonance Study in the Bovec Basin (NW Slovenia) Related to 1998 and 2004 Damaging Earthquakes

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