Abstract
The purpose of the site characterization and validation (SCV) project is to predict groundwater flow and nuclide transport in a previously unexplored volume of the Stripa granite. The project comprises five stages. This report concerns the borehole seismic investigations carried out during stage 3. The objective has been to review the localization and characterization of fractured and altered rock zones performed in stage 1. The seismic acquisition apparatus and the data processing techniques have been the subject of major changes with respect to stage 1 and their features are outlined. The use of boreholes is important, as surveys performed from drifts and surface permit only a limited probing angle of the site volume. The approach consists of applying in parallel two methods: two-dimensional crosshole tomography and a new three-dimensional reflection imaging technique. The reflection method detects changes in acoustic impedance, which is an accurate way of finding the boundaries of rock features. The tomographic method maps variation of the rock properties, like wave velocity and attenuation. The fractured zones from the SCV site produce a faint seismic response. Extensive processing was used to achieve a unambiguous interpretation of the reflection data. The tomographic analysis of velocities reveals and extremely flat
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Citation Formats
Cosma, C, Heikkinen, P, Keskinen, J, and Korhonen, R.
Site characterization and validation - results from seismic crosshole and reflection measurements - Stage 3.
Sweden: N. p.,
1991.
Web.
Cosma, C, Heikkinen, P, Keskinen, J, & Korhonen, R.
Site characterization and validation - results from seismic crosshole and reflection measurements - Stage 3.
Sweden.
Cosma, C, Heikkinen, P, Keskinen, J, and Korhonen, R.
1991.
"Site characterization and validation - results from seismic crosshole and reflection measurements - Stage 3."
Sweden.
@misc{etde_10111360,
title = {Site characterization and validation - results from seismic crosshole and reflection measurements - Stage 3}
author = {Cosma, C, Heikkinen, P, Keskinen, J, and Korhonen, R}
abstractNote = {The purpose of the site characterization and validation (SCV) project is to predict groundwater flow and nuclide transport in a previously unexplored volume of the Stripa granite. The project comprises five stages. This report concerns the borehole seismic investigations carried out during stage 3. The objective has been to review the localization and characterization of fractured and altered rock zones performed in stage 1. The seismic acquisition apparatus and the data processing techniques have been the subject of major changes with respect to stage 1 and their features are outlined. The use of boreholes is important, as surveys performed from drifts and surface permit only a limited probing angle of the site volume. The approach consists of applying in parallel two methods: two-dimensional crosshole tomography and a new three-dimensional reflection imaging technique. The reflection method detects changes in acoustic impedance, which is an accurate way of finding the boundaries of rock features. The tomographic method maps variation of the rock properties, like wave velocity and attenuation. The fractured zones from the SCV site produce a faint seismic response. Extensive processing was used to achieve a unambiguous interpretation of the reflection data. The tomographic analysis of velocities reveals and extremely flat variation of 1-3%. (au).}
place = {Sweden}
year = {1991}
month = {Jan}
}
title = {Site characterization and validation - results from seismic crosshole and reflection measurements - Stage 3}
author = {Cosma, C, Heikkinen, P, Keskinen, J, and Korhonen, R}
abstractNote = {The purpose of the site characterization and validation (SCV) project is to predict groundwater flow and nuclide transport in a previously unexplored volume of the Stripa granite. The project comprises five stages. This report concerns the borehole seismic investigations carried out during stage 3. The objective has been to review the localization and characterization of fractured and altered rock zones performed in stage 1. The seismic acquisition apparatus and the data processing techniques have been the subject of major changes with respect to stage 1 and their features are outlined. The use of boreholes is important, as surveys performed from drifts and surface permit only a limited probing angle of the site volume. The approach consists of applying in parallel two methods: two-dimensional crosshole tomography and a new three-dimensional reflection imaging technique. The reflection method detects changes in acoustic impedance, which is an accurate way of finding the boundaries of rock features. The tomographic method maps variation of the rock properties, like wave velocity and attenuation. The fractured zones from the SCV site produce a faint seismic response. Extensive processing was used to achieve a unambiguous interpretation of the reflection data. The tomographic analysis of velocities reveals and extremely flat variation of 1-3%. (au).}
place = {Sweden}
year = {1991}
month = {Jan}
}