EGU21-9749, updated on 14 Jan 2022
EGU General Assembly 2021
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Cluster analysis in the studying of stress relation in the Vrancea-zone

Lili Czirok1,2,3, Lukács Kuslits1,4, and Katalin Gribovszki1
Lili Czirok et al.
  • 1CSFK Geodetic and Geophysical Institute, Sopron, Hungary (
  • 2University of Pécs, Faculty of Sciences, Institute of Geography and Earth Sciences, Department of Geology and Metorology, Pécs, Hungary
  • 3University of Sopron Faculty of Forestry, Roth Gyula Forestry and Wildlife Management Doctoral School, Sopron, Hungary
  • 4Eötvös Loránd University, Faculty of Sciences, Doctoral School of Environmental Sciences, Budapest, Hungary

The SE-Carpathians produce significant geodynamic activity due to the current subduction process. The strong seismicity in the Vrancea-zone is its most important indicator. The focus area of these seismic events is relatively small, around 80*100 km and the distribution of their locations is quiet dense.

The authors have carried out cluster analyses of the focal mechanism solutions estimated from local and tele-seismic measurements and stress inversions to support the recent and previously published studies in this region. They have applied different pre-existing clustering methods – e.g. HDBSCAN (hierarchical density-based clustering for applications with noise) and agglomerative hierarchical analysis – considering to the geographical coordinates, focal depths and parameters of the focal mechanism solutions of the used seismic events, as well. Moreover, they have attempted to improve a fully-automated algorithm for the classification of the earthquakes for the estimations. This algorithm does not call for the setting of hyper-parameters, thus the affection of the subjectivity can be reduced significantly and the running time can be also decreased. In all cases, the resulted stress tensors are in close agreement with the earlier presented results.

How to cite: Czirok, L., Kuslits, L., and Gribovszki, K.: Cluster analysis in the studying of stress relation in the Vrancea-zone, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-9749,, 2021.


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