Inversion of the October 27, 2004 Vrancea (Romania) earthquake using teleseismic waveforms data

Ţugui, A.; Craiu, Marius

doi:10.1556/ageod.43.2008.2-3.7

Cited by 4 publications

(1 citation statement)

References 9 publications

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“…Stress inversion results (Fig. 2 ) clearly characterize the stress regime, in agreement with the tectonic framework of the Vrancea slab 55 . Seismic sources reveal a stress field consistent with an almost pure compressional stress regime ( vertical) with directions of the maximum horizontal principal stress Sh max ranging from NNW-SSE to WNW-ESE (Table S1 , Fig.…”

Section: Resultssupporting

confidence: 76%

A switch from horizontal compression to vertical extension in the Vrancea slab explained by the volume reduction of serpentine dehydration

Craiu

Ferrand

Manea

et al. 2022

Sci Rep

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The Vrancea slab, Romania, is a subducted remnant of the Tethyan lithosphere characterized by a significant intermediate-depth seismicity (60–170 km). A recent study showed a correlation between this seismicity and major dehydration reactions, involving serpentine minerals up to 130 km depth, and high-pressure hydrated talc deeper. Here we investigate the potential link between the triggering mechanisms and the retrieved focal mechanisms of 940 earthquakes, which allows interpreting the depth distribution of the stress field. We observe a switch from horizontal compression to vertical extension between 100 and 130 km depth, where the Clapeyron slope of serpentine dehydration is negative. The negative volume change within dehydrating serpentinized faults, expected mostly sub-horizontal in the verticalized slab, could well explain the vertical extension recorded by the intermediate-depth seismicity. This apparent slab pull is accompanied with a rotation of the main compressive stress, which could favour slab detachments in active subduction zones.

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Section: Resultssupporting

confidence: 76%

A switch from horizontal compression to vertical extension in the Vrancea slab explained by the volume reduction of serpentine dehydration

Craiu

Ferrand

Manea

et al. 2022

Sci Rep

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Empirical evaluation of the control period TC for intermediate-depth earthquakes: application for Romania

Pavel

Yaghmaei‐Sabegh

2023

Nat Hazards

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Vrancea intermediate-depth focal mechanism catalog: a useful instrument for local and regional stress field estimation

Craiu

Mihai

et al. 2022

Acta Geophys.

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The Vrancea seismic zone, located in the bend region of the South-Eastern Carpathians, is a unique area with both crustal and intermediate-depth seismic activity and is known as one of the most active seismic area in Europe. Moderate crustal seismicity is recorded all over the Carpathian region, but the far more intense activity occurs in a small subcrustal seismogenic volume beneath the SE‐bend of the Carpathian arc with about 20 × 50 km lateral and 110 km vertical extent (70–180 km depth). A unique slab geometry, likely preserved until the present, causes stress localization due to the slab bending and subsequent stress release resulting in large mantle earthquakes in the region. The main focus of this study is to determine the focal mechanisms for events with a magnitude larger than 2.7, between 2005 and 2020 and evaluate the current stress field along the Vrancea subcrustal region, from the derived fault plane solutions. The main style of faulting for Vrancea subcrustal events presents a predominant reverse one, with two main earthquakes categories: the first one with the nodal planes, oriented NE–SW parallel with the Carpathian Arc and the second one with the nodal planes, oriented NW–SE perpendicular on the Carpathian Arc. The results of stress inversion indicate a dominant thrust faulting style, with an average stress regime index of 2.87. The stress pattern shows similar partitioning with vertical extension in the slab and no preferred orientation in the overlying crust, showing a transition regime from the extensional regime in the Moesian Platform to the compressional regime in the Vrancea subcrustal zone.

show abstract

Inversion of the October 27, 2004 Vrancea (Romania) earthquake using teleseismic waveforms data

Cited by 4 publications

References 9 publications

A switch from horizontal compression to vertical extension in the Vrancea slab explained by the volume reduction of serpentine dehydration

A switch from horizontal compression to vertical extension in the Vrancea slab explained by the volume reduction of serpentine dehydration

Empirical evaluation of the control period TC for intermediate-depth earthquakes: application for Romania

Vrancea intermediate-depth focal mechanism catalog: a useful instrument for local and regional stress field estimation

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