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Multicomponent broadband digital-based seismic landstreamer for near-surface applications
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
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2015 (English)In: Journal of Applied Geophysics, ISSN 0926-9851, E-ISSN 1879-1859, Vol. 123, 227-241 p.Article in journal (Refereed) Published
Abstract [en]

During the last few decades there has been an increased demand for infrastructure, along with a greater awareness of environmental issues in the construction industry. These factors have contributed to an increased interest in using seismic methods for near surface characterization, particularly in urban environments. Seismic sensors not affected by anthropogenic electromagnetic noise are therefore important, as well as an acquisition system that is easy to deploy, move and non-invasive. To address some of these challenges, a multicomponent broadband MEMS (micro-electro mechanical system) based landstreamer system was developed. The landstreamer system is fully digital, therefore it is less sensitive to electrical or electromagnetic noise. Crosstalk, leakage and tilting tests show that the system is superior to its predecessors. The broadband nature of the sensors (theoretically 0–800 Hz), 3C (three-component) recording and the close spacing of the sensors enable high-resolution imaging. The current streamer configuration consists of 20 sensors 4 m apart and 80 sensors 2 m apart. The streamer can easily be combined with wireless recorders for simultaneous data acquisition. In this study, we present results from testing of the streamer with various sources, such as a shear wave vibrator and different types of impact sources. MEMS-sensors and their high sensitivity allowed recording clear reflections that were not observed with coil-based sensors. A complementary test was also carried out at a planned access ramp for an urban tunnel where potential poor quality rocks had been identified by drilling. First-break traveltime tomography showed that these poor quality rocks correlate with low velocity zones. The presented landstreamer system has great potential for characterizing the subsurface in noisy environments.

Place, publisher, year, edition, pages
2015. Vol. 123, 227-241 p.
Keyword [en]
Landstreamer, MEMS, Tomography, Near-surface, Urban environment
National Category
Geophysics
Identifiers
URN: urn:nbn:se:uu:diva-267390DOI: 10.1016/j.jappgeo.2015.10.009ISI: 000366073400022OAI: oai:DiVA.org:uu-267390DiVA: diva2:872987
Funder
Swedish Research Council Formas, 252-2012-1907
Available from: 2015-11-21 Created: 2015-11-21 Last updated: 2017-12-10Bibliographically approved
In thesis
1. Multicomponent digital-based seismic land-streamer for urban underground infrastructure planning
Open this publication in new window or tab >>Multicomponent digital-based seismic land-streamer for urban underground infrastructure planning
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Uppsala: Uppsala University, Department of Earth Sciences, 2015. 39 p.
Keyword
Landstreamer, multicomponent, tomography, tunnel-surface seismics
National Category
Geophysics
Research subject
Geophysics with specialization in Solid Earth Physics
Identifiers
urn:nbn:se:uu:diva-267426 (URN)
Presentation
2015-12-01, Skåne, Villavagen 16, Department of Earth Sciences, Uppsala, 10:00 (English)
Opponent
Supervisors
Available from: 2015-11-23 Created: 2015-11-23 Last updated: 2015-11-23Bibliographically approved
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Brodic, BojanMalehmir, AlirezaJuhlin, ChristopherDynesius, LarsPalm, Hans

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