Geophysical pre-investigation for a Stockholm tunnel project : Joint inversion and interpretation of geoelectric and seismic refraction data in an urban environment
(2018) In Near Surface Geophysics 16(3). p.258-268- Abstract
Underground constructions for public traffic purposes are becoming increasingly important for urban areas in order to use the limited space more efficiently. Several electric resistivity tomography and seismic refraction tomography measurements were performed crossing a water passage near Stockholm during the pre-investigation phase of a tunnel building project. The objective was to determine the bedrock interface and qualitatively assess the rock quality. The scope of this study is to present a field case in an urban environment and show improvements of geophysical results due to additional model constraints by a joint inversion. Results of individual inversions show a large transition zone below the seabed from electric resistivity... (More)
Underground constructions for public traffic purposes are becoming increasingly important for urban areas in order to use the limited space more efficiently. Several electric resistivity tomography and seismic refraction tomography measurements were performed crossing a water passage near Stockholm during the pre-investigation phase of a tunnel building project. The objective was to determine the bedrock interface and qualitatively assess the rock quality. The scope of this study is to present a field case in an urban environment and show improvements of geophysical results due to additional model constraints by a joint inversion. Results of individual inversions show a large transition zone below the seabed from electric resistivity tomography. Some parts of the seismic refraction tomography have a low model resolution, due to gas-bearing sediments with a low velocity together with a high noise level, which leads to insufficient investigation depth that makes it difficult to determine the bedrock interface. However, the bedrock interface could be reconstructed in the resistivity model by performing a joint inversion, using the seismic velocity model to constrain the electric resistivity tomography model and vice versa. Adjacent geotechnical soundings support the joint inversion results. A vertical low resistive zone could be identified as a dominant fracture zone in the southern part of the investigated area. In general, the joint inversion approach significantly improved the electric resistivity tomography results and provided a more reliable bedrock estimation.
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- author
- Ronczka, Mathias LU ; Wisén, Roger LU and Dahlin, Torleif LU
- organization
- publishing date
- 2018-06-01
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- ERT, Joint inversion, Seismic refraction, SRT, Urban geophysics
- in
- Near Surface Geophysics
- volume
- 16
- issue
- 3
- pages
- 11 pages
- publisher
- EAGE
- external identifiers
-
- scopus:85048553334
- ISSN
- 1569-4445
- DOI
- 10.3997/1873-0604.2018009
- project
- Geoelectrical Imaging for Site Investigation for Urban Underground Infrastructure
- Integrated Use and Interpretation of Data from Geophysical and Non-Geophysical Methods for Site Investigation for Underground Construction
- language
- English
- LU publication?
- yes
- id
- 63886bad-0244-41f6-a018-d501af948551
- date added to LUP
- 2018-06-29 13:33:51
- date last changed
- 2022-05-03 03:55:35
@article{63886bad-0244-41f6-a018-d501af948551,
abstract = {{<p>Underground constructions for public traffic purposes are becoming increasingly important for urban areas in order to use the limited space more efficiently. Several electric resistivity tomography and seismic refraction tomography measurements were performed crossing a water passage near Stockholm during the pre-investigation phase of a tunnel building project. The objective was to determine the bedrock interface and qualitatively assess the rock quality. The scope of this study is to present a field case in an urban environment and show improvements of geophysical results due to additional model constraints by a joint inversion. Results of individual inversions show a large transition zone below the seabed from electric resistivity tomography. Some parts of the seismic refraction tomography have a low model resolution, due to gas-bearing sediments with a low velocity together with a high noise level, which leads to insufficient investigation depth that makes it difficult to determine the bedrock interface. However, the bedrock interface could be reconstructed in the resistivity model by performing a joint inversion, using the seismic velocity model to constrain the electric resistivity tomography model and vice versa. Adjacent geotechnical soundings support the joint inversion results. A vertical low resistive zone could be identified as a dominant fracture zone in the southern part of the investigated area. In general, the joint inversion approach significantly improved the electric resistivity tomography results and provided a more reliable bedrock estimation.</p>}},
author = {{Ronczka, Mathias and Wisén, Roger and Dahlin, Torleif}},
issn = {{1569-4445}},
keywords = {{ERT; Joint inversion; Seismic refraction; SRT; Urban geophysics}},
language = {{eng}},
month = {{06}},
number = {{3}},
pages = {{258--268}},
publisher = {{EAGE}},
series = {{Near Surface Geophysics}},
title = {{Geophysical pre-investigation for a Stockholm tunnel project : Joint inversion and interpretation of geoelectric and seismic refraction data in an urban environment}},
url = {{https://lup.lub.lu.se/search/files/47061365/Ronczka_Wis_n_Dahlin_2018_joint_inversion_and_interpretation_of_ERT_SRT_NSG_16_258_268.pdf}},
doi = {{10.3997/1873-0604.2018009}},
volume = {{16}},
year = {{2018}},
}