Source parameters of the earthquake sequence that occurred close to the BURAR array (Romania) between 24 June and 1 July 2011

Popescu, Emilia; Plăcintă, Anica Otilia; Rădulian, Mircea; Borleanu, Felix; Diaconecu, Mihail; Popa, Mihaela

doi:10.4401/ag-7285

Cited by 2 publications

(3 citation statements)

References 12 publications

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“…The statistics are too small for larger earthquakes to have an eloquent image of scaling. In Figure 10 we can notice both for P and S-wave determinations an increasing trend of stress drop with the seismic moment which may suggest a higher slip rather than a higher fault dimension [19].…”

Section: Scaling Relationshipsmentioning

confidence: 93%

“…The poly-kinetic character of these events has been pointed out by previous studies [13,14] as well as through the analysis of several significant earthquake sequences [15,16] generated along the Eastern Carpathians [17][18][19] However, the 2014 Mărăs , es , ti seismic sequence differs from past ones, because of the location of a large part of the hypocenters close to the crust-mantle discontinuity and because of the subsequent increase of seismic activity spread over an unusually large area in the adjacent regions (Figures 1 and 2).…”

Section: Introductionmentioning

confidence: 99%

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Earthquake Source Properties of a Lower Crust Sequence and Associated Seismicity Perturbation in the SE Carpathians, Romania, Collisional Setting

et al. 2021

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Romanian seismicity is mainly confined to the Eastern Carpathians Arc bend (ECAB), where strong subcrustal earthquakes (magnitude up to 7.9) are generated in a narrow lithospheric body descending into the mantle. The seismic activity in the overlying crust is spread over a larger area, located mostly toward the outer side of the ECAB. It is significantly smaller than subcrustal seismicity, raising controversies about possible upper mantle-crust coupling. A significant earthquake sequence took place in the foreland of the ECAB triggered on 22 November 2014 by a mainshock of magnitude 5.7 (the greatest instrumentally recorded earthquake in this region) located in the lower crust. The mainshock triggered a significant increase in the number of small-magnitude events spread over an unusually large area in the ECAB. The paper’s goal is to compute the source parameters of the earthquakes that occurred during the aforementioned sequence, by empirical application of Green’s function and spectral ratio techniques. Fault plane solutions are determined using multiple methods and seismicity evolution at regional scale is investigated. Our results highlight a still active deformation regime at the edge of the EE Craton, while the source parameters reveal a complex fracture of the mainshock and a very high-stress drop.

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Section: Scaling Relationshipsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Earthquake Source Properties of a Lower Crust Sequence and Associated Seismicity Perturbation in the SE Carpathians, Romania, Collisional Setting

et al. 2021

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“…The events are of small-to-moderate magnitude (M w ≤ 3.3) belonging to the background seismicity. Four of them are main shocks of local earthquake sequences: 30 April 2004 (15 events), 29 November -3 December 2007 (41 events), 6 -30 September 2008 (42 events) and 6 December 2009 (23 events), while the other 38 are single events [Tugui et al 2009, Popescu et al 2011, Romplus earthquake catalogue: http://www.infp.ro/romplus/].…”

Section: Moesian Platform Seismogenic Zone -Momentioning

confidence: 99%

Earthquake mechanism and characterization of seismogenic zones in south-eastern part of Romania

Rădulian

Bălă

Popescu

et al. 2018

Annals of Geophysics

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Earthquake mechanism information is fundamental to determine the stress field and to define seismogenic zones. At the same time, it is a basic input to compute seismic hazard by deterministic approach. The present paper extends the catalogue of the fault plane solutions for the earthquakes in Romania, previously completed until 1997, for 1998-2012 time interval. The catalogue is limited geographically to the Carpathians Orogeny and extra-Carpathians area located in the southeastern part of Romania because similar investigations cover the rest of the country. The catalogue comprises 259 intermediate-depth seismic events and 90 crustal seismic events, recorded in the considered time interval with acceptably constrained fault plane solutions (minimum 10 reliable polarities, small ratio of rejected polarities versus input polarities and non-zero focal depth). We use specific graphical tools in order to emphasize statistically representative features of the stress field as coming out from our results. The fault plane solutions of the Vrancea earthquakes generated in a confined sinking plate in the mantle reflect the dominant geodynamic process in the study region. The typical features revealed by all the previous studies on the subcrustal seismic activity (predominant dip-slip, reverse faulting, characterizing both the weak and strong earthquakes) are reproduced as well by our investigation. As concerns the earthquake activity in the crust, a few new refined aspects are highlighted in the present work: (1) a deficit of the strike-slip component over the entire Carpathians foredeep area, (2) different stress field pattern in the Făgăraş-Câmpulung zone as compared with the Moesian Platform and Pre-Dobrogean and Bârlad Depressions, (3) a larger range for the dip angle of the nodal planes in the Vrancea subcrustal source, ~ 40°-70° against ~ 70°, as commonly considered.

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Source parameters of the earthquake sequence that occurred close to the BURAR array (Romania) between 24 June and 1 July 2011

Cited by 2 publications

References 12 publications

Earthquake Source Properties of a Lower Crust Sequence and Associated Seismicity Perturbation in the SE Carpathians, Romania, Collisional Setting

Earthquake Source Properties of a Lower Crust Sequence and Associated Seismicity Perturbation in the SE Carpathians, Romania, Collisional Setting

Earthquake mechanism and characterization of seismogenic zones in south-eastern part of Romania

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