Differences in the Crustal and Uppermost Mantle Structure of the Bohemian Massif from Teleseismic Receiver Functions

Wilde−Piórko, Monika; Saul, Joachim; Grad, M.

doi:10.1007/s11200-005-1627-3

Cited by 40 publications

(31 citation statements)

References 40 publications

(37 reference statements)

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“…This apparent mismatch may have its origin in (1) different resolution scales of the two methods and (2) the complex nature of the crust mantle boundary in the area under investigation, possibly leading to the existence of two Mohos ‐ a refraction Moho and a RF Moho. However, our results agree very well with the Moho depths obtained by Wilde‐Piórko et al [2005] using RF analysis at broadband stations within and around the Bohemian Massif. They obtained crustal thicknesses between 28 and 31 km at stations in the Saxothuringian unit.…”

Section: Discussion Of the Moho Depth Mapsupporting

confidence: 89%

Seismic evidence for asthenospheric updoming beneath the western Bohemian Massif, central Europe

Heuer

Geissler

Kind

et al. 2006

Geophysical Research Letters

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Detailed images of the lithosphere beneath the western Bohemian Massif were obtained by analysis of more than 8500 P receiver functions. At the intersection of Regensburg‐Leipzig‐Rostock zone and Eger Rift, crustal thickness decreases to 26 km from approx. 31 km in the surroundings. The receiver functions display a positive phase at about 6 s delay time and a strong negative phase at 7 to 8 s, which coincides with an area of Moho updoming, CO2 mantle‐derived degassing and earthquake swarm activity. These phases can be modeled by a velocity increase at 50 km and a velocity decrease at 65 km depth. The velocity decrease, observed over an area of 5300 km2, gives evidence for local asthenospheric updoming and/or a confined body of partial melt, which might be the cause for high CO2 mantle fluid flow and earthquake swarm activity in this recently nonvolcanic, intracontinental rift area.

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Section: Discussion Of the Moho Depth Mapsupporting

confidence: 89%

Seismic evidence for asthenospheric updoming beneath the western Bohemian Massif, central Europe

Heuer

Geissler

Kind

et al. 2006

Geophysical Research Letters

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“…Our model consists of nine layers with 20 (crustal layers) 60 (deepest mantle layer) km large horizontal blocks, enlarging with depth down to 380 km. The starting model is based on a 1‐D local crustal velocity model derived from Deep Seismic Sounding (DSS) measurements (Beránek & Zátopek 1981; Mayerová et al 1994; Hrubcová et al 2005) and receiver function methods (Geissler et al 2005; Wilde‐Piórko et al 2005), and the 1‐D IASP91 velocity distribution (Kennett & Engdahl 1991) just underneath. The smooth crustal model assumes average crustal velocity, depth of Moho, as well as thickness and average velocity of unconsolidated sediments.…”

Section: Tomographic Imaging Of the Upper Mantle Beneath The Bohemimentioning

confidence: 99%

Upper mantle beneath the Eger Rift (Central Europe): plume or asthenosphere upwelling?

Plomerová

Achauer

Babuška

et al. 2007

Geophysical Journal International

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S U M M A R YWe present the first results of a high-resolution teleseismic traveltime tomography and seismic anisotropy study of the lithosphere-asthenosphere system beneath the western Bohemian Massif. The initial high-resolution tomography down to a depth of 250 km did not image any columnar low-velocity anomaly which could be interpreted as a mantle plume anticipated beneath the Eger Rift, similar to recent findings of small plumes beneath the French Massif Central and the Eifel in Germany. Alternatively, we interpret the broad low-velocity anomaly beneath the Eger Rift by an upwelling of the lithosphere-asthenosphere transition. We also map lateral variations of seismic anisotropy of the mantle lithosphere from spatial variations of P-wave delay times and the shear wave splitting. Three major domains characterised by different orientations of seismic anisotropy correspond to the major tectonic units-Saxothuringian, Moldanubian and the Teplá-Barrandian-and their fabrics fit to those found in our previous studies of mantle anisotropy on large European scales.

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“…Group, 1988;Behr et al, 1994;DEKORP and Orogenic Processes Working Groups, 1999;Tomek et al, 1997) as well as the refraction and wide-angle reflection experiments as GRANU'95 (Enderle et al, 1998), CELEBRATION 2000 with CEL09 profile (Hrubcová et al, 2005) or SUDETES 2003 with S01 profile (Grad et al, 2008). Passive seismic experiments with permanent and temporary seismic stations were carried out to study the major lithospheric discontinuities using the receiver function method (Geissler et al, 2005;Wilde-Piórko et al, 2005;Heuer et al, 2006). Different seismic methods, namely the receiver function and the refraction and wide-angle reflection measurements, sampled the crust-mantle boundary, which resulted in the interpretation of the depth and nature of this major discontinuity with respect to the method applied.…”

Section: Introductionmentioning

confidence: 99%

The crust-mantle transition and the Moho beneath the Vogtland/West Bohemian region in the light of different seismic methods

Hrubcová

Geissler

2009

Stud Geophys Geod

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The structure of the crust and the crust-mantle boundary in the Vogtland/West Bohemian region have been a target of several seismic measurements for the last 25 years, beginning with the steep-angle reflection seismic studies 9HR), the refraction and wide-angle experiments (GRANU'95, CELEBRATION 2000, SUDETES 2003, and followed by passive seismic studies (receiver functions, teleseismic tomography). The steep-angle reflection studies imaged a highly reflective lower crust (4 to 6 km thick) with the Moho interpreted in a depth between 30 and 32 km and a thinner crust beneath the Eger Rift. The refraction and wide-angle reflection seismic studies (CELEBRATION 2000) revealed strong wide-angle reflections in a depth of 2628 km interpreted as the top of the lower crust. Long coda of these reflections indicates strong reflectivity in the lower crustal layer, a phenomenon frequently observed in the Caledonian and Variscan areas. The receiver function studies detected one strong conversion from the base of the crust interpreted as the Moho discontinuity at a depth between 27 and 37 km (average at about 31 km). The discrepancies in the Moho depth determination could be partly attributed to different background of the methods and their resolution, but could not fully explain them. So that new receivers function modelling was provided. It revealed that, instead of a first-order Moho discontinuity, the observations can be explained with a lower crustal layer or a crust-mantle transition zone with a maximum thickness of 5 km. The consequent synthetic ray-tracing modelling resulted in the model with the top of the lower crust at 28 km, where highly reflective lower crustal layer can obscure the Moho reflection at a depth of 3233 km.K e y w o r d s : Bohemian Massif, Vogtland/West Bohemia, crustal structure, Moho, refraction and wide-angle reflection, receiver function, seismic methods, Eger Rift

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Differences in the Crustal and Uppermost Mantle Structure of the Bohemian Massif from Teleseismic Receiver Functions

Cited by 40 publications

References 40 publications

Seismic evidence for asthenospheric updoming beneath the western Bohemian Massif, central Europe

Seismic evidence for asthenospheric updoming beneath the western Bohemian Massif, central Europe

Upper mantle beneath the Eger Rift (Central Europe): plume or asthenosphere upwelling?

The crust-mantle transition and the Moho beneath the Vogtland/West Bohemian region in the light of different seismic methods

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