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Complex landslide in the Rječina valley (Croatia): origin and sliding mechanism

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Abstract

This paper discusses the development of the Grohovo landslide on the north-eastern slope of the Rječina valley, the largest active landslide along the Croatian part of the Adriatic Sea coast. This complex retrogressive landslide was reactivated in December 1996. Thirteen separate slide bodies have been identified. The slide surface is considered to be on the upper flysch bedrock. Monitoring indicated that the magnitude of displacements was very different in time and space. The maximum movements were recorded on the upper part of the slope. The limestone mega-block and separated rocky blocks on top of the slope have also moved, which is not a typical phenomenon of the flysch slopes in the area of Rijeka.

Résumé

L’article décrit l’évolution du glissement de Grohovo, sur les pentes nord-est de la vallée de Rjecina. Il s’agit du plus important glissement actif le long de la partie croate de la côte adriatique. Ce glissement complexe, en évolution régressive, a été réactivé en décembre 1996. Treize unités disjointes en rupture ont été identifiées. La surface de glissement est supposée se situer au contact du flysch supérieur constituant le substratum. L’instrumentation mise en place a montré la diversité dans le temps et l’espace des valeurs de déplacements. Les mouvements les plus importants ont été enregistrés en partie supérieure de la pente. Une importante masse rocheuse calcaire et des blocs isolés au sommet de la pente se sont aussi déplacés, ce qui ne correspond pas à des phénomènes typiques sur les pentes de flysch de la région de Rjeka.

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Authors and Affiliations

  1. Faculty of Civil Engineering, Department of Hydrotechnics and Geotechnics, University of Rijeka, V.Cara_Emina 5, 51000, Rijeka, Croatia

    Čedomir Benac

  2. Department of Rijeka, Civil Engineering Institut of Croatia, Vukovarska 10a, 51000, Rijeka, Croatia

    Željko Arbanas

  3. Department of Geology and Geological Engineering, University of Zagreb, Faculty of Mining, Geology and Petroleum Engineering, Pierottieva 6, 10000, Zagreb, Croatia

    Vladimir Jurak

  4. Department of Rijeka, Croatian Waters, Šporerova 3, 51000, Rijeka, Croatia

    Maja Oštrić

  5. Department of Hydrotechnics and Geotechnics, University of Rijeka, Faculty of Civil Engineering, V.Cara_Emina 5, 51000, Rijeka, Croatia

    Nevenka Ožanić

Authors
  1. Čedomir Benac
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  2. Željko Arbanas
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  3. Vladimir Jurak
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  4. Maja Oštrić
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  5. Nevenka Ožanić
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Correspondence to Čedomir Benac.

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Benac, Č., Arbanas, Ž., Jurak, V. et al. Complex landslide in the Rječina valley (Croatia): origin and sliding mechanism. Bull Eng Geol Environ 64, 361–371 (2005). https://doi.org/10.1007/s10064-005-0002-5

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  • DOI: https://doi.org/10.1007/s10064-005-0002-5

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