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Multicomponent digital-based seismic land-streamer for urban underground infrastructure planning
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Uppsala: Uppsala University, Department of Earth Sciences , 2015. , 39 p.
Keyword [en]
Landstreamer, multicomponent, tomography, tunnel-surface seismics
National Category
Geophysics
Research subject
Geophysics with specialization in Solid Earth Physics
Identifiers
URN: urn:nbn:se:uu:diva-267426OAI: oai:DiVA.org:uu-267426DiVA: diva2:873173
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
List of papers
1. Multicomponent broadband digital-based seismic landstreamer for near-surface applications
Open this publication in new window or tab >>Multicomponent broadband digital-based seismic landstreamer for near-surface applications
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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.

Keyword
Landstreamer, MEMS, Tomography, Near-surface, Urban environment
National Category
Geophysics
Identifiers
urn:nbn:se:uu:diva-267390 (URN)10.1016/j.jappgeo.2015.10.009 (DOI)000366073400022 ()
Funder
Swedish Research Council Formas, 252-2012-1907
Available from: 2015-11-21 Created: 2015-11-21 Last updated: 2017-12-10Bibliographically approved
2. All wave-modes converted and reflected from fracture systems: A tunnel-surface seismic experiment
Open this publication in new window or tab >>All wave-modes converted and reflected from fracture systems: A tunnel-surface seismic experiment
2015 (English)Manuscript (preprint) (Other academic)
National Category
Geophysics
Identifiers
urn:nbn:se:uu:diva-267456 (URN)
Available from: 2015-11-23 Created: 2015-11-23 Last updated: 2017-01-25Bibliographically approved

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