2.5-D seismic tomographic modelling of the crustal structure of north-western Spitsbergen based on deep seismic soundings

Czuba, Wojciech

doi:10.1007/s11001-007-9028-3

Cited by 7 publications

(2 citation statements)

References 30 publications

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“…This is also the case of the Moffen Fault Zone, which is thought to be a late Cenozoic normal fault (Eiken 1992;Geissler & Jokat 2004;Geissler et al 2011) and whose north-east-south-west-striking segment was not identified on seismic data (present study), thus suggesting that the fault dies out west of Wijdefjorden. In addition, no major north-south-striking fault and no major offset of the top-basement reflection were observed on seismic data in areas east and west of the mouth of Wijdefjorden, and seismic velocities do not show any abrupt lateral variation characteristic of the presence of a major fault (Czuba et al 2004(Czuba et al , 2005Czuba 2007). Moreover, studies along onshore portions of the Billefjorden Fault Zone showed that large-scale strikeslip movements are unlikely (Lamar et al 1986;Lamar & Douglass 1995;Piepjohn 2000;Michalski et al 2012).…”

Section: Discussionmentioning

confidence: 99%

The Billefjorden Fault Zone north of Spitsbergen: a major terrane boundary?

Koehl

Allaart

2021

Polar Research

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The Billefjorden Fault Zone is a major terrane boundary in the Norwegian Arctic. The fault separates basement rocks of Svalbard’s north-eastern and north-western terranes that recorded discrete Precambrian tectonothermal histories and were accreted, intensely deformed and metamorphosed during the Caledonian Orogeny. Although the fault represents a major, crustal-scale tectonic boundary, its northward extent is not well constrained. The present short contribution addresses this issue and presents new seismic mapping of structures and rock units north of Wijdefjorden, where the Billefjorden Fault Zone may continue. This study shows that there is no evidence for major faulting of the top-basement reflection, and therefore, that the Billefjorden Fault Zone may die out within Wijdefjorden–Austfjorden, step ≥ 20 km laterally, or be invisible on the presented seismic data. Seismic data also suggest that Caledonian basement rocks in Ny-Friesland (north-eastern terrane) are not significantly different from basement rocks below the Devonian Graben in Andrée Land (north-western terrane). Potential implications include the absence of a major terrane boundary in northern Spitsbergen.

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Section: Discussionmentioning

confidence: 99%

The Billefjorden Fault Zone north of Spitsbergen: a major terrane boundary?

Koehl

Allaart

2021

Polar Research

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“…In order to perform a coupled (joint) inversion of P g and P m P traveltimes we used Jive3D software (Hobro 1999; Hobro et al 2003). It has been successfully used to invert wide‐angle data sets in different acquisition configurations in order to obtain multilayer models in 2‐D (Majdański et al 2006), 2.5‐D (Czuba 2007) and 3‐D (Evangelidis et al 2004; Majdański et al 2007).…”

Section: Modellingmentioning

confidence: 99%

Testing robust inversion strategies for three-dimensional Moho topography based on CELEBRATION 2000 data

Malinowski

Środa

Grad

et al. 2009

Geophysical Journal International

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S U M M A R YIn this paper, we present results of the 3-D tomographic modelling of the crustal structure and Moho topography applied to data recorded in SE Poland during the CELEBRATION 2000 seismic experiment. The target area covers ca. 500 km × 500 km and represents a complex geological setting from old Precambrian platform (East European Craton, EEC), through the crustal blocks (terranes) that form the Trans-European Suture Zone, to the young Alpine orogen-the Carpathians. We test two different inversion strategies using two different algorithms: (i) coupled inversion of P g and P m P arrivals to constrain both the crustal velocities and the Moho depths; (ii) decoupled inversion of P m P arrivals only using previously obtained smooth 3-D crustal velocity model. The coupled inversion of 11 700 P g and 3100 P m P arrivals results in a much smoother crustal velocity field than the one previously obtained by inversion of first arrivals only. Also, the obtained Moho structure is much smoother than the Moho map compiled from the existing 2-D models. Decoupled inversion of the P m P reflections provides Moho structure comparable in resolution to the compiled map. Synthetic tests indicate that with our data set we are able to resolve larger than 100-km-size Moho structures. The modelled Moho is shallowest in the area of the Upper Silesian Block (ca. 32 km), then it is deepening by ca. 10 km over 100-km-wide zone along the margin of the EEC and finally it reaches up to 48 km depth in the area of the EEC. Our favoured strategy for modelling large refraction/wide-angle reflection data set consists of derivation of a smooth crustal velocity model by a first-arrival tomography and then complementing this model by a decoupled inversion of P m P reflections in order to constrain minimum-structure Moho topography.

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Crust and Lithospheric Structure - Global Crustal Structure

Mooney

2015

Treatise on Geophysics

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2.5-D seismic tomographic modelling of the crustal structure of north-western Spitsbergen based on deep seismic soundings

Cited by 7 publications

References 30 publications

The Billefjorden Fault Zone north of Spitsbergen: a major terrane boundary?

The Billefjorden Fault Zone north of Spitsbergen: a major terrane boundary?

Testing robust inversion strategies for three-dimensional Moho topography based on CELEBRATION 2000 data

Crust and Lithospheric Structure - Global Crustal Structure

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