VRANCEA99—the crustal structure beneath the southeastern Carpathians and the Moesian Platform from a seismic refraction profile in Romania

Hauser, F.; Rãileanu, V.; Fielitz, W.; Bălă, Andrei; Prodehl, C.; Polonic, Gabriela; Schulze, A.

doi:10.1016/s0040-1951(01)00195-0

Cited by 90 publications

(73 citation statements)

References 27 publications

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“…The earthquake hypocenters are concentrated in an area with 20 × 50 km lateral and 110 km vertical extent in the 70-180-km-depth range beneath the Vrancea zone (Oncescu and Bonjer, 1997;Sperner et al, 2001). In addition, subcrustal seismic attenuation has been also detected northwest and partly below the Vrancea zone, which can indicate the presence of shallow, hot asthenosphere, possibly with partially melted zones (Hauser et al, 2001;Popa et al, 2005;Russo et al, 2005). It seems to be clear that there is a geodynamic relationship between these processes (volcanic and seismic activity); however, interpretations of the magma genesis and the origin of the vertical slab are fairly controversial.…”

Section: Calc-alkaline Volcanism In the Eastern Part Of The Carpathiamentioning

confidence: 99%

Genesis of the Neogene to Quaternary volcanism in the Carpathian-Pannonian region: Role of subduction, extension, and mantle plume

Harangi

Lenkey

2007

Cenozoic Volcanism in the Mediterranean Area

124

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Neogene to Quaternary volcanism of the Carpathian-Pannonian region is part of the extensive volcanic activity in the Mediterranean and surrounding regions. Using the spatial and temporal distribution of the magmatic rocks, their major-and traceelement features, and Sr-Nd-Pb isotope characteristics, we suggest that lithospheric extension in the Pannonian Basin had a major role in the generation of the magmas. Dehydration of subducting slab should have resulted in thorough metasomatism in the mantle wedge during Cretaceous to early Miocene that would have lowered the melting temperature, therefore playing an indirect role in the generation of magmas later on. Mixing between mantle-derived magmas and lower-crustal melts was an important process at the fi rst stage of the silicic and calc-alkaline magmatism in the Northern Pannonian Basin. However, the crustal component gradually decreased with time, which is consistent with magmatic activity in a continuously thinning continental plate. Calc-alkaline volcanism along the Eastern Carpathians was mostly postcollisional and could have been related to slab break-off processes. However, the fairly young (<1.5 Ma) potassic magmatism at the southeasternmost segment of the Carpathian volcanic arc could be explained by lithospheric delamination under the Vrancea zone. Alkaline basaltic volcanism began at the end of rifting of the Pannonian Basin (11 Ma) and continued until recently. We suggest that a mantle plume beneath the Pannonian Basin is highly unlikely and the mafi c magmas were formed by small degree partial melting in a heterogeneous asthenospheric mantle, which has been close to the solidus temperature due to the lithospheric extension in the Miocene. Magmatism appears to have been in a waning phase for the last 2 m.y., but recent volcanic eruptions (<200 k.y.) indicate that future volcanic activity cannot be unambiguously ruled out.

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Section: Calc-alkaline Volcanism In the Eastern Part Of The Carpathiamentioning

confidence: 99%

Genesis of the Neogene to Quaternary volcanism in the Carpathian-Pannonian region: Role of subduction, extension, and mantle plume

Harangi

Lenkey

2007

Cenozoic Volcanism in the Mediterranean Area

124

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“…The sediments beneath Bucharest have been well investigated in the past in shallow geophysical studies (for a summary, see Mândrescu et al 2004), major seismic experiments like the lithospheric-scale refraction profiles VRANCEA99 and VRANCEA2001 (Hauser et al 2001(Hauser et al , 2002) and combined seismic-drilling projects (Lungu et al 1999a, b;Mândrescu et al 2004;. Recent strong motion studies, conducted to determine the peak ground acceleration (PGA) for risk assessment, revealed a strong spatial and frequency-dependent variability of PGA across the city (e.g.…”

Section: Introductionmentioning

confidence: 99%

Broadband frequency-dependent amplification of seismic waves across Bucharest, Romania

Sudhaus

Ritter

2008

J Seismol

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The determination of seismic amplitude amplification is a fundamental contribution to seismic hazard assessment. While often only highfrequency amplitude variations (>1 Hz) are taken into account, we analyse broadband waveforms from 0.14 to 8.6 Hz using a temporary network of 32 stations in and around the earthquake-prone city of Bucharest. Spectral amplitudes are calculated with an adaptive multiple-taper approach. Across our network (aperture 25 km × 25 km), we find a systematic northwest/southeast-oriented structural influence on teleseismic P-wave amplitudes from 0.14 to 0.86 Hz that can be explained by constructive interference in the dipping Cenozoic sedimentary layers. For higher frequencies (1.4-8.75 Hz), more local site effects prevail and can be correlated partly among neighbouring stations. The transition between systematic and localised amplitude variations occurs at about 1 Hz.

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“…Saintot et al, 2006). The suture lies perhaps in the vicinity of the CapidavaOvidiu Fault Zone (Romania), which marks a significant lateral change in crustal-upper mantle velocity structure according to recent refraction seismic data (Hauser et al, 2001). The likely affinity of crust of the Istanbul Zone (western Pontides) in western Turkey with that of the southern part of the Moesian Platform (e.g.…”

Section: The Southern Region Of Baltica: Pre-cadomian (?)mentioning

confidence: 92%

Baltica in the Cryogenian, 850–630 Ma

Pease

Daly

Elming

et al. 2008

Precambrian Research

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VRANCEA99—the crustal structure beneath the southeastern Carpathians and the Moesian Platform from a seismic refraction profile in Romania

Cited by 90 publications

References 27 publications

Genesis of the Neogene to Quaternary volcanism in the Carpathian-Pannonian region: Role of subduction, extension, and mantle plume

Genesis of the Neogene to Quaternary volcanism in the Carpathian-Pannonian region: Role of subduction, extension, and mantle plume

Broadband frequency-dependent amplification of seismic waves across Bucharest, Romania

Baltica in the Cryogenian, 850–630 Ma

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