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| Titel |
High resolution reflection seismic profiling over the Tjellefonna fault in the Møre-Trøndelag Fault Complex, Norway |
| VerfasserIn |
E. Lundberg, C. Juhlin, A. Nasuti |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1869-9510
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| Digitales Dokument |
URL |
| Erschienen |
In: Solid Earth ; 3, no. 1 ; Nr. 3, no. 1 (2012-06-13), S.175-188 |
| Datensatznummer |
250000845
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| Publikation (Nr.) |
 copernicus.org/se-3-175-2012.pdf |
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| Zusammenfassung |
| The Møre-Trøndelag Fault Complex (MTFC) is one of the most prominent
fault zones of Norway, both onshore and offshore. In spite of its
importance, very little is known of the deeper structure of the individual
fault segments comprising the fault complex. Most seismic lines have been
recorded offshore or focused on deeper structures. This paper presents
results from two reflection seismic profiles, located on each side of the
Tingvollfjord, acquired over the Tjellefonna fault in the southeastern part
of the MTFC. Possible kilometer scale vertical offsets, reflecting large
scale northwest-dipping normal faulting, separating the high topography to
the southeast from lower topography to the northwest have been proposed for
the Tjellefonna fault or the Baeverdalen lineament. In this study, however,
the Tjellefonna fault is interpreted to dip approximately 50–60° towards the
southeast to depths of at least 1.3 km. Travel-time modeling of reflections
associated with the fault was used to establish the geometry of the fault
structure at depth, while detailed analysis of first P-wave arrivals in shot
gathers, together with resistivity profiles, were used to define the near
surface geometry of the fault zone. A continuation of the structure on the
northeastern side of the Tingvollfjord is suggested by correlation of an in
strike direction P-S converted reflection (generated by a fracture zone)
seen on the reflection data from that side of the Tingvollfjord. The
reflection seismic data correlate well with resistivity profiles and
recently published near surface geophysical data. A highly reflective
package forming a gentle antiform structure was also identified on both
seismic profiles. This structure could be related to the folded amphibolite
lenses seen on the surface or possibly by an important boundary within the
gneissic basement rocks of the Western Gneiss Region. The fold hinge line of
the structure is parallel with the Tjellefonna fault trace suggesting that
the folding and faulting may have been related. |
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