Numerical Modelling of Block-structure Dynamics: Application to the Vrancea Region

Panza, G. F.; Soloviev, A.; Vorobieva, Inessa

doi:10.1007/s000240050028

Cited by 31 publications

(25 citation statements)

References 2 publications

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“…Certainly this implies the availability of data covering the time scale of the tectonic processes, which is not the case for the earthquake catalogues presently available. However, the main trends identified in the reported catalogues could be representative of the potential earthquakes, at least in some cases, as shown by PANZA et al (1997) for the Vrancea seismic region.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Seismogenic Zones of Romania

Rădulian

Mândrescu

Panza

et al. 2000

Pure appl. geophys.

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107

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Although the time and magnitude range covered by available seismological data is limited, several significant regional trends are outlined in the seismogenic zones of Romania. Vrancea region, which is by far the most seismically active area, has a persistent rate of occurrence of intermediate-depth earthquakes, clustered in a very confined focal volume, and a clear compressive stress regime. The deformation field, as deduced from the available fault plane solutions, is drastically reduced in the crust, where the maximum magnitude is below 6.5 (except Shabla zone, in Bulgaria). The system of major faults developed in a NW-SE direction in the Carpathians foredeep area is certainly linked to the subduction process in Vrancea, although they seem not to play a significantly active role, as could be expected for an active subduction process. The existing data indicate an extensional deformation regime over the foredeep area and Southern Carpathians, while a predominant compressive regime is outlined at the contact between the eastern margin of the Pannonian Depression and Carpathians orogen, in agreement with the bending tendency of the maximum horizontal compression orientation of the crustal stress field from NE-SW, in western and central Europe, to E -W, in the intra-Carpathian region (GRÜ NTHAL and STROMEYER, 1992).

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Section: Introductionmentioning

confidence: 99%

Characterization of Seismogenic Zones of Romania

Rădulian

Mândrescu

Panza

et al. 2000

Pure appl. geophys.

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107

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“…Panza et al [22] studied a model of block structure dynamics of the Vrancea region where the block system moves due to prescribed horizontal motion of the boundary blocks and of the medium underlying the blocks and showed similar features of real and synthetic catalogues. Here I present a dynamical model of block structure, the principal part of which is a sinking slab (see [2] for more details).…”

Section: Model Of Block-and-fault Dynamicsmentioning

confidence: 94%

Modelling of Stress and Seismicity in the South-Eastern Carpathians

Ismail‐Zadeh

2003

Risk Science and Sustainability Science for Reduction of Risk and Sustainable Development of Society

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“…For all blocks and faults the coefficients in (1) are: K ¼ 1 bar/cm and W ¼ 0.05 cm/bar. For all faults the thresholds for j are: B ¼ 0.1, H f ¼ 0.085, and H s ¼ 0.07, and for W s ¼ 5 cm/bar, like those used in previous studies (i.e., PANZA et al, 1997;SOLOVIEV et al, 2000;VOROBIEVA et al, 2000). These parameters reflect the rheology of fault zones in the dimensionless time domain considered for the modeling; a detailed analysis of these parameters and their relation with published estimations (see, e.g., KARNER et al, 2003) goes beyond the scope of the present study.…”

Section: Numerical Experimentsmentioning

confidence: 99%

“…The output of the modeling consists of kinematical data on the block movements that can be compared with observations (e.g., GPS), as well as of a synthetic earthquake catalog, where each event has origin time, coordinates of epicenter, magnitude and source mechanism. On the basis of the experience accumulated to date, the synthetic earthquake catalog reproduces not only some of the basic global features of observed seismicity like (a) the GutenbergRichter law (e.g., PANZA et al, 1997), (b) the space and time clustering of earthquakes (MAKSIMOV and SOLOVIEV, 1999) and (c) the dependence of the occurrence of large earthquakes on the fragmentation of the faults network, and on the rotation of blocks (KEILIS-BOROK et al, 1997), but also several regional features of seismicity, like (1) the epicenter distribution, (2) the relative level of seismic activity in different areas of the region and (3) the type of fault plane solution.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Seismicity in the Block-structure Model of Italy and its Surroundings

Peresan

Vorobieva

Soloviev

et al. 2007

Pure appl. geophys.

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The numerical block-model of the lithosphere dynamics is used to simulate seismicity in Italy and its surroundings, based on the available structural and geodynamics information. The purpose of the study is to understand which are the tectonic processes that control the main features of the observed seismicity and the kinematics of the region. The influence of the rheology of the fault systems is studied as well. The model we use differs from other modeling approaches in that it simulates earthquakes and hence it possibly relates to seismicity and geodynamics. The model provides an effective capability to include the set of documented constraints supplied by widely available earthquake catalogs. This is done by means of the comparison of the GR relation, of the focal mechanisms and of the space distribution for observed and computed seismicity. The region is modeled as a system of perfectly rigid blocks, separated by infinitely thin fault planes, in viscoelastic interaction between themselves and with the underlying medium. The movement of the boundary blocks and of the underlying medium determines the motion of the blocks. The synthetic seismicity obtained with the defined block-model is similar to the observed one for the most seismically active areas. A linear frequency-magnitude (FM) relation (Gutenberg-Richter law) is obtained for synthetic earthquakes; the slope (b-value) of the FM plot appears larger for the synthetic seismicity than for the observed one. Nevertheless, the b-value is essentially larger in northern and central Italy than that in southern Italy, both in the model and in the observations. The analysis of the source mechanisms of the synthetic earthquakes shows a good agreement with the observations. In the model normal faulting is typical for the Apennines, the eastern edge of Sicily and the Calabrian arc, while reverse faulting takes place at the northwestern boundary of the Adriatic Sea, in the southern Alps and along the eastern edge of the Adria, along the Dinarides. The model correctly reproduces the extension zone along the Apennines and the contraction zone along the northwestern boundary of the Adriatic Sea; the counter-clockwise rotation of the Adria is mimed. The resulting movements of the blocks are in overall agreement with GPS (Global Positioning System) observations. The results of the modeling experiments suggest that the main features of dynamics and seismicity in the central Mediterranean region cannot be satisfactorily explained as a consequence of Africa and Eurasia convergence only; the passive subduction in the Calabrian arc and the different rheology of faults are essential as well

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Numerical Modelling of Block-structure Dynamics: Application to the Vrancea Region

Cited by 31 publications

References 2 publications

Characterization of Seismogenic Zones of Romania

Characterization of Seismogenic Zones of Romania

Modelling of Stress and Seismicity in the South-Eastern Carpathians

Simulation of Seismicity in the Block-structure Model of Italy and its Surroundings

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