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TitleMapping the Nechako Basin using earthquake waves
AuthorCassidy, J FORCID logo; Kim, H; Dosso, S E
Source 2008. Open Access logo Open Access
LinksOnline - En ligne
Alt SeriesEarth Sciences Sector, Contribution Series 20070538
MeetingInvited presentation at: Interior Basins Workshop; Calgary, AB; CA; February 19, 2008
Documentcomputer file
Mediaon-line; digital
File formatpdf
ProvinceBritish Columbia
NTS92N; 92O; 93B; 93C; 93F; 93G
Lat/Long WENS-126.0000 -122.0000 54.0000 51.0000
Subjectssedimentology; geophysics; basins; sedimentary basins; basin analysis; basin geometry; geophysical interpretations; seismic interpretations; seismic velocities; Nechacko Basin
Illustrationslocation maps; graphs; plots
ProgramMountain Pine Beetle
AbstractDuring the last decade, unusual hot, dry summers and mild winters in central British Columbia led to an abundance of mountain pine beetles, which have destroyed millions of lodgepole pine (the province’s most commercially harvested tree). This is having a significant and negative impact on the people and communities who make a living by forestry in central British Columbia. Minerals or energy extraction may provide alternate economic opportunities for the region. To assist in this, we are undertaking a passive source seismic mapping to help assess the hydrocarbon and mineral potential of the Nechako Basin area in central BC. The Nechako Basin has been the focus of limited hydrocarbon exploration since the 1930's. Twelve exploratory wells were drilled and oil stains on drill chip samples and the presence of gas in drill stem tests attests to the presence of a hydrocarbon system. Seismic data collected in the 1980's were of generally poor quality with little energy penetrating the volcanic cover. In this study, we will utilise recordings of distant earthquakes to map the sediment thickness, crustal thickness, and overall geometry of the Nechako Basin. An array of seven seismic stations was deployed in September, 2006 to sample much of the basin. The results of this study will complement independent active source seismic studies that are planned for the region, by providing images using waves coming "from below," and by providing constraints on the shear wave velocity. The results of this research will also complement MT studies that are currently underway, providing critical new information on porosity, fractures, and fluids. We present preliminary results of this research.

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