Revised catalogue of earthquake mechanisms for the events occurred in Romania until the end of twentieth century: REFMC

Rădulian, Mircea; Bălă, Andrei; Ardeleanu, L.; Petrescu, Laura; Popescu, Emilia

doi:10.1007/s40328-018-0243-y

Cited by 20 publications

(11 citation statements)

References 17 publications

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“…The stress field for the Vrancea intermediate-depth seismic body (60–200 km) is calculated using the inversion of 940 focal mechanisms for events that occurred between 1929 and 2020 22 , 23 . To observe the stress field evolution with depth (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The events have moment magnitudes M W > 2.7 and occurred between 1929 and 2020. We estimate 437 focal mechanism solutions for events since 2005 22 ; older data are from the REFMC catalogue 23 .…”

Section: Methodsmentioning

confidence: 99%

“…Knowing about the stress state and orientation of the stress field within the slab could help grasp the mechanisms involved. Therefore, a better understanding of the link, if any, between triggering mechanisms 9 and focal mechanisms 22 , 23 of the seismic ruptures is needed.…”

Section: Introductionmentioning

confidence: 99%

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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: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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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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“…In the present study we computed the stress field pattern in the Vrancea area by inverting the earthquake focal mechanisms using an extended and complete set of fault-plane solutions available for the Vrancea intermediatedepth and crustal earthquakes recorded between 1929 and 2012 [Radulian et al, 2018[Radulian et al, , 2019.…”

Section: Discussionmentioning

confidence: 99%

“…Early studies pointed out that most of the Vrancea intermediate-depth earthquakes are following this pattern regardless of magnitude [Enescu, 1980;Oncescu 1987;Oncescu and Trifu, 1987]. Later on, some variability of the fault-plane solutions is also recorded [Enescu and Enescu, 1998;Radulian et al, 2019]. Some studies, based on detailed and refined seismicity pattern analysis, suggest the existence of two predominant alignments, both oriented tangent to the Carpathians Arc (NE-SW), but with a small (~5 km) relative displacement around 100 km depth [Ganas et al, 2010;Cărbunar et al, 2011].…”

Section: Andrei Bala Et Almentioning

confidence: 99%

Present-day stress field pattern in the Vrancea seismic zone (Romania) deduced from earthquake focal mechanism inversion

Bălă

Rădulian

Toma-Dănilă

2021

Annals of Geophysics

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Vrancea seismogenic zone in the South-Eastern Carpathians is characterized by localized intermediate-depth seismicity. Due to its complex geodynamics and large strain release, Vrancea represents a key element in the Carpatho-Pannonian system. Data from a recently compiled catalogue of fault plane solutions (REFMC) are inverted to evaluate stress regime in Vrancea on depth. A single predominant downdip extensive regime is obtained in all considered clusters, including the crustal layers located above the Vrancea slab. The prevalent stress regime confirms previous investigations and requires some mantle-crust coupling. The S3 principal stress is close to vertical, while S1 and S2 are horizontal, oriented perpendicularly and respectively tangentially to the Carpathians Arc bend. This configuration is present at any depth level. According to seismicity patterns, there are two main active segments in the Vrancea intermediate-depth domain, at 55 – 105 km and 105 – 180 km, both able to generate major events. The configuration of the tectonic stresses as resulted from inversion is similar in both segments. Also, high fault instability (I > 0.95) is characterizing the segments. The only notable difference is given by the friction and stress ratio parameters which drop down in the bottom segment from μ = 0.95 to μ = 0.55 and from R = 0.51 to R = 0.29. This variation is attributed to possible weakening processes activated below 100 km depth and can explain the intensification of seismicity production as earthquake rate and average energy release in the lower segment versus the upper segment.

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Recommended Path Durations for Stochastic Simulations of Ground Motions Generated by Vrancea Intermediate-Depth Seismic Source

Coțovanu

Vǎcǎreanu

2021

Pure Appl. Geophys.

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Revised catalogue of earthquake mechanisms for the events occurred in Romania until the end of twentieth century: REFMC

Cited by 20 publications

References 17 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

Present-day stress field pattern in the Vrancea seismic zone (Romania) deduced from earthquake focal mechanism inversion

Recommended Path Durations for Stochastic Simulations of Ground Motions Generated by Vrancea Intermediate-Depth Seismic Source

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