Reflection seismic imaging of the end-glacial Pärvie Fault system, northern Sweden

Juhlin, Christopher; Dehghannejad, Mahdieh; Lund, Björn; Malehmir, Alireza; Pratt, G.

doi:10.1016/j.jappgeo.2009.06.004

Cited by 82 publications

(87 citation statements)

References 32 publications

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“…above water table) and another one was focused on the bedrock surface and the structures in its immediate vicinity. An approach tested before (Miller and Xia 1998;Juhlin et al 2010;Malehmir et al 2013a;Place et al 2015) was to combine two different sets of reflections, by generating a stack focusing on very shallow reflections and another one focusing on bedrock reflections or below the water table. This gave the best results for profile 1 where 10-20 m deep shallow structures could be identified.…”

Section: Refraction and Reflection Data Imagingmentioning

confidence: 99%

Interlobate esker architecture and related hydrogeological features derived from a combination of high-resolution reflection seismics and refraction tomography, Virttaankangas, southwest Finland

et al. 2016

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A novel high-resolution (2-4 m source and receiver spacing) reflection and refraction seismic survey was carried out for aquifer characterization and to confirm the existing depositional model of the interlobate esker of Virttaankangas, which is part of the Säkylänharju-Virttaankangas glaciofluvial esker-chain complex in southwest Finland. The interlobate esker complex hosting the managed aquifer recharge (MAR) plant is the source of the entire water supply for the city of Turku and its surrounding municipalities. An accurate delineation of the aquifer is therefore critical for long-term MAR planning and sustainable use of the esker resources. Moreover, an additional target was to resolve the poorly known stratigraphy of the 70-100-m-thick glacial deposits overlying a zone of fractured bedrock. Bedrock surface as well as fracture zones were confirmed through combined reflection seismic and refraction tomography results and further validated against existing borehole information. The highresolution seismic data proved successful in accurately delineating the esker cores and revealing complex stratigraphy from fan lobes to kettle holes, providing valuable information for potential new pumping wells. This study illustrates the potential of geophysical methods for fast and cost-effective esker studies, in particular the digital-based landstreamer and its combination with geophone-based wireless recorders, where the cover sediments are reasonably thick.

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Section: Refraction and Reflection Data Imagingmentioning

confidence: 99%

Interlobate esker architecture and related hydrogeological features derived from a combination of high-resolution reflection seismics and refraction tomography, Virttaankangas, southwest Finland

et al. 2016

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“…This system has proven to be useful for imaging fault zones, deformation zones and the upper crust in crystalline environments (e.g. Dehghannejad et al, 2010;Juhlin et al, 2010;Juhlin and Lund, 2011;Lundberg and Juhlin, 2011). The system consists of a hydraulic breaking hammer mounted on a tractor or excavator.…”

Section: Data Acquisitionmentioning

confidence: 99%

High resolution reflection seismic profiling over the Tjellefonna fault in the Møre-Trøndelag Fault Complex, Norway

2012

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Abstract. 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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“…Many PG faults in Fennoscandia have been studied with structural/tectonic investigations, ground geophysical surveys, reflection seismic studies, excavations, and a few with shallow drill holes (, 500 m) (Olesen et al 1992;Roberts et al 1997;Kuivamäki et al 1998;Bäckblom & Stanfors 1998;Olesen et al 2004;Lagerbäck & Sundh 2008;Juhlin et al 2009;Kukkonen et al 2009b). However, systematic in-situ information on PG faults at depth is still lacking.…”

Section: Articlementioning

confidence: 99%

Postglacial Faults in Fennoscandia: Targets for scientific drilling

Kukkonen

Olesen

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2010

GFF

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During the last stages of the Weichselian glaciation (ca. 9,000-15,000 years B.P.), reduced ice loads and glacially affected stress fields resulted in active faulting in Fennoscandia with fault scarps up to 160 km long and up to 30 m high. These postglacial (PG) faults are usually SE dipping, SW-NE oriented thrusts, and represent reactivated, pre-existing crustal discontinuities. Postglacial faulting indicates that the glacio-isostatic compensation is not only a gradual viscoelastic phenomenon, but also includes unexpected violent earthquakes, suggestively larger than other known earthquakes in stable continental regions. We explore here possibilities and benefits for investigating, via scientific drilling, the characteristics of postglacial faults in northern Fennoscandia, including their structure and rock properties, present and past seismic activity and state of stress, as well as hydrogeology and associated deep biosphere. The research is anticipated to advance science in neotectonics, hydrogeology and deep biosphere studies, and provide important information for nuclear waste disposal, petroleum exploration on the Norwegian continental shelf and studies of mineral resources in PG fault areas.

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Reflection seismic imaging of the end-glacial Pärvie Fault system, northern Sweden

Cited by 82 publications

References 32 publications

Interlobate esker architecture and related hydrogeological features derived from a combination of high-resolution reflection seismics and refraction tomography, Virttaankangas, southwest Finland

Interlobate esker architecture and related hydrogeological features derived from a combination of high-resolution reflection seismics and refraction tomography, Virttaankangas, southwest Finland

High resolution reflection seismic profiling over the Tjellefonna fault in the Møre-Trøndelag Fault Complex, Norway

Postglacial Faults in Fennoscandia: Targets for scientific drilling

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