Characterization of Seismogenic Zones of Romania

Rădulian, Mircea; Mândrescu, N.; Panza, G. F.; Popescu, Emilia; Utale, A.

doi:10.1007/978-3-0348-8415-0_4

Cited by 23 publications

(24 citation statements)

References 10 publications

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“…The break-off has been proceeding since the Late Miocene and is presently in the final stage in the Vrancea region (Oncescu 1987). Focal mechanism solutions of shallow earthquakes (depth <70 km) show that the foreland plate before the Vrancea orogenic corner is being subjected to radial S Hmax , perpendicular to the orogenic arc, with a relative balance between three types of stress regimes (Radulian et al 2000;Reinecker et al 2003). The Southern Carpathians are characterized by the S Hmax striking along the orogen in W-E direction and by dominance of strike-slip and extensional stress regimes.…”

Section: North European Platementioning

confidence: 99%

“…The Southern Carpathians are characterized by the S Hmax striking along the orogen in W-E direction and by dominance of strike-slip and extensional stress regimes. In Dobrogea, a WNW-ESE orientation of S Hmax and a normal fault stress regime prevails, although also sinistral strikeslip motions along NW-striking planes are inferred from earthquake focal mechanisms (Radulian et al 2000). (Reinecker et al 2003) supplemented with the data in Roth & Fleckenstein (2001) and Jarosiński (2005a).…”

Section: North European Platementioning

confidence: 99%

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Redistribution of recent collision push and ridge push in Central Europe: insights from FEM modelling

Jarosiński¹,

Beekman²,

Bada³

et al. 2006

Geophysical Journal International

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S U M M A R Y2-D elastic finite element models of the recent stress field of Central Europe are built to evaluate the loads exerted on the continental boundary and the magnitude of tectonic stresses within the continental part of the plate. The models comprise 24 tectonic blocks (their stiffness is either constant throughout the model or varies from block to block), 16 fault zones and 12 geologically significant boundary segments. We have obtained a relatively unique balance of external tectonic forces by (1) careful adjustment of calculated stress directions and regimes to complex pattern of stress from data and (2) by calibration with gravitational potential energy. A high level of compression (ca. 9 × 10 12 N m −1 ) exerted to the short Ionian side of the Adriatic indenter is crucial for the stress-field pattern in Central Europe. The Adria microplate rotates due to eccentricity between the Africa push from the south and the Alpine buttress to the north. A free boundary of the Apennines does not contribute significantly to this motion. Kinematics of this indenter is controlled by friction on the Dinaric suture, which, in turn is decisive for strain-energy distribution between the Alpine and the Pannonian domains. The predicted pronounced extension in the Greece-Aegean segment (2.5 × 10 12 N m −1 ) implies active pull transferred from the Hellenic subduction zone. This extension releases stress in the Balkan-Pannonian region and enables the eastward escape of tectonic blocks in front of advancing Adria. Significant changes of tectonic push trends are found along the Black SeaCaucasus boundary segment and at the European passive margin from the North Sea to the Arctic Ocean. Differential stresses in Central Europe are estimated in the range of 10-60 MPa when averaged over the 30-80-km-thick mechanically heterogeneous lithosphere. The maximum stiffness contrast across the model is predicted to be of one order of magnitude. Apparent friction coefficients of fault zones differ between the North European part of the plate (0.4-0.7), the Pannonian region (0.15-0.25) and the Dinaric suture (0.55).

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Section: North European Platementioning

confidence: 99%

Section: North European Platementioning

confidence: 99%

Redistribution of recent collision push and ridge push in Central Europe: insights from FEM modelling

Jarosiński¹,

Beekman²,

Bada³

et al. 2006

Geophysical Journal International

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“…The focal mechanisms of 138 events with a good quality of the statistical parameters (Table 1) were computed, hypothesising double-couple focal sources. However, it is known that in active tectonic areas (Campus et al, 1993;Radulian et al, 2000;Aoudia et al, 2003), as well as in volcanic and geothermal areas (Saraó et al, 2001;Panza and Saraó, 2000), non-double-couple mechanisms are possible. In our opinion the double-couple focal source hypothesis is supported by conclusions reached in other studies carried out with different methodologies, which fit well with the results of our study of the focal mechanisms.…”

Section: Spatial-temporal Evolution Of Stressmentioning

confidence: 97%

Correlation between the dynamics of the Hyblean Foreland and Etnean volcanism

Agostino¹,

Patanè²,

Delfa³

2009

Journal of Geodynamics

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“…The typical focal mechanism of strong Vrancea earthquakes (M w > 6) is a reverse faulting, with principal T axes almost vertical and P axes horizontal (RADULIAN et al, 2000a). The fault plane orientation can be grouped in two main types: -fault plane NE-SW oriented and P axes perpendicular to the mountain arc (class A); -fault plane NW-SE oriented with P axes parallel to the mountain arc (class B).…”

Section: Characteristics Of Vrancea Regionmentioning

confidence: 99%

Deterministic Approach for the Seismic Microzonation of Bucharest

Cioflan

Apostol

Moldoveanu

et al. 2004

Pure and Applied Geophysics

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The mapping of the seismic ground motion in Bucharest, due to the strong Vrancea earthquakes is carried out using a complex hybrid waveform modeling method which combines the modal summation technique, valid for laterally homogeneous anelastic media, with finite-differences technique, and optimizes the advantages of both methods. For recent earthquakes, it is possible to validate the modeling by comparing the synthetic seismograms with the records. We consider for our computations the frequency range from 0.05 to 1.0 Hz and control the synthetic signals against the accelerograms of the Magurele station, low-pass filtered with a cut-off frequency of 1.0 Hz of the 3 last major strong (Mw > 6) Vrancea earthquakes. Using the hybrid method with a double-couple seismic source approximation, scaled for the source dimensions and relatively simple regional (bedrock) and local structure models, we succeeded in reproducing the recorded ground motion in Bucharest at a satisfactory level for seismic engineering. Extending the modeling to the entire territory of the Bucharest area, we construct a new seismic microzonation map, where five different zones are identified by their characteristic response spectra

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Characterization of Seismogenic Zones of Romania

Cited by 23 publications

References 10 publications

Redistribution of recent collision push and ridge push in Central Europe: insights from FEM modelling

Redistribution of recent collision push and ridge push in Central Europe: insights from FEM modelling

Correlation between the dynamics of the Hyblean Foreland and Etnean volcanism

Deterministic Approach for the Seismic Microzonation of Bucharest

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