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Revealing the deeper structure of the end-glacial Pärvie fault system in northern Sweden by seismic reflection profiling
Department of Earth Sciences, Uppsala University.
Department of Earth Sciences, Uppsala University, Uppsala universitet.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.ORCID iD: 0000-0003-1998-0769
Department of Earth Sciences, Uppsala University.
2015 (English)In: Solid Earth Discussions, ISSN 1869-9537, Vol. 6, no 2, p. 537-563Article in journal (Refereed) Published
Abstract [en]

Fault scarps that extend up to 155 km and have offsets of tens of meters at the surface are present in the northern parts of Finland, Norway and Sweden. These fault scarps are inferred to have formed during earthquakes with magnitudes up to 8 at the time of the last deglaciation. The Pärvie fault system represents the largest earthquake so far documented in northern Scandinavia, both in terms of its length and its calculated magnitude. It is also the longest known glacially induced fault in the world. Present-day microearthquakes occur along the length of the fault scarp on the eastern side of the scarp, in general agreement with an east dipping main fault. In the central section of the fault, where there is a number of subsidiary faults east of the main fault, it has been unclear how the earthquakes relate to the faults mapped at the surface. A seismic profile across the Pärvie Fault system acquired in 2007, with a mechanical hammer as a source, showed a good correlation between the surface mapped faults and moderate to steeply dipping reflectors. The most pronounced reflector could be mapped to about 3 km depth. In an attempt to map the fault system to deeper levels, a new 22 km long 2-D seismic profile which followed the 2007 line was acquired in June 2014. For deeper penetration an explosive source with a maximum charge size of 8.34 kg in 20 m deep shot holes was used. Reflectors can now be traced to deeper levels with the main 65◦ east dipping fault interpreted as a weakly reflective structure. As in the previous profile, there is a pronounced strongly reflective 60◦ west dipping structure present to the east of the main fault that can now be mapped to about 8 km depth. Extrapolations of the main and subsidiary faults converge at a depth of about 11.5 km where current earthquake activity is concentrated, suggesting their intersection has created favorable conditions for seismic stress release. Based on the present and previous seismic reflection data, potential locations for future boreholes for drilling into the fault system are proposed.

Place, publisher, year, edition, pages
2015. Vol. 6, no 2, p. 537-563
Keywords [en]
Earth sciences - Endogenous eartn sciences
Keywords [sv]
reflection seismic, Pärvie fault, Geovetenskap - Endogen geovetenskap
National Category
Geochemistry
Research subject
Applied Geology; Future mining (AERI)
Identifiers
URN: urn:nbn:se:ltu:diva-8579DOI: 10.5194/se-6-621-2015ISI: 000357128400020Scopus ID: 2-s2.0-84928211909Local ID: 718c17af-813c-4264-99b9-7b3c461f0881OAI: oai:DiVA.org:ltu-8579DiVA, id: diva2:981517
Note
Validerad; 2015; Nivå 2; 20150224 (maas)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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