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Site characterization and validation - results from seismic crosshole and reflection measurements - Stage 3

Technical Report:

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  More>>
Authors:
Cosma, C; Heikkinen, P; Keskinen, J; Korhonen, R [1] 
  1. Vibrometric Oy, Helsinki (Finland)
Publication Date:
Jan 01, 1991
Product Type:
Technical Report
Report Number:
STRIPA-TR-91-07
Reference Number:
SCA: 540250; 052002; PA: AIX-23:010992; SN: 92000637730
Resource Relation:
Other Information: PBD: Jan 1991
Subject:
54 ENVIRONMENTAL SCIENCES; 12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; SEISMIC SURVEYS; VERIFICATION; BOREHOLES; EXPERIMENTAL DATA; GEOLOGIC FRACTURES; GEOLOGY; RADIOACTIVE WASTE DISPOSAL; REFLECTION; SEISMIC WAVES; UNDERGROUND DISPOSAL; 540250; 052002; SITE RESOURCE AND USE STUDIES; WASTE DISPOSAL AND STORAGE
OSTI ID:
10111360
Research Organizations:
Swedish Nuclear Fuel and Waste Management Co., Stockholm (Sweden)
Country of Origin:
Sweden
Language:
English
Other Identifying Numbers:
Other: ON: DE92613497; TRN: SE9100232010992
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
SWDN
Size:
66 p.
Announcement Date:
Jun 30, 2005

Technical Report:

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}
}