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| Titel |
Reflection seismic studies over the end-glacial Burträsk fault, Skellefteå, Sweden |
| VerfasserIn |
C. Juhlin, B. Lund |
| 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 ; 2, no. 1 ; Nr. 2, no. 1 (2011-01-07), S.9-16 |
| Datensatznummer |
250000448
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| Publikation (Nr.) |
 copernicus.org/se-2-9-2011.pdf |
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| Zusammenfassung |
| Reflection seismic data were acquired along a ca. 22 km long profile over the
end-glacial Burträsk fault with a nominal receiver and source spacing of
20 m. A steeply dipping reflection can be correlated to the Burträsk
fault, indicating that the fault dips at about 55° to the southeast near
the surface. The reflection from the fault is rather poorly imaged, probably
due to a lateral offset in the fault of about 1 km at this location and the
crookedness of the seismic profile in the vicinity of the fault. A more
pronounced steeply dipping reflection is observed about 4 km southeast of the
Burträsk fault. Based on its correlation with a topographic low at the
surface this reflection is interpreted to originate from a fracture zone.
There are no signs of large displacements along this zone as the glacial ice
receded, but earthquakes could be associated with it today. Other
reflections on the processed seismic section may originate from changes in
lithological variations in the supra-crustal rocks or from intrusions of
more mafic rock. Constraints on the fault geometry provided by the
reflection seismic data will help determine what stresses were required to
activate the fault when the major rupture along it occurred ca. 9500 years
ago. |
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