Department of Mining & Minerals Engineering

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Forecasting Subsequent Seismicity Using Double-Difference Tomography—Jeffrey Kerr, Master’s Student
The concept of the project is to forecast seismic activity at a mine site using Double-Difference Tomography.  To further explore the possibility of forecasting, Creighton Mine, an underground nickel mine in Sudbury, Ontario, Canada supplied two months of seismic data.  The mine is located in a seismically active zone, with nearly 10,000 events in the two month period. 

With known stressed locations, geologic mapping of the area, and/or previously worked numerical modeling for Creighton, the desire and goal of the project is to predict/forecast future high stressed zones.  Tomograms, in conjunction with other hazard mapping, would then allow for a better understanding of the possible hazardous areas and further increase the safety of the mine site.

Use of Synthetic Data to Optimize Geophone Locations for Monitoring CO2 Migration during Geologic Sequestration - Ben Fahrman, Master’s Student
Velocity models representing five stages of CO2 plume development were created, each with a set of microseismic events.  Multiple receiver arrays were also considered for each of the stages of sequestration.  Travel times between the events and the geophones were then calculated, and a new velocity model was created using double difference seismic tomography.  Analysis of the different geophone arrays will include a comparison of results to inputted velocity model, a comparison of results to real-world application, and economic considerations.

CO2 Plume Imaging Through the Use of Double Difference Tomography—Brent Slaker, Master’s Student
This project is concerned with the accurate imaging of both the location and movement of a CO2 plume as it exists over a mile below the surface in the Aneth Oil Field.  Travel times were given between over 1200 seismic events and 23 geophones arranged in a vertical borehole.
Using Double-Difference Tomography and applying knowledge of the local geology, it is hoped that an accurate image of CO2 plume migration can be formed.  This would be central to the need for monitoring, verification, and accounting associated with sequestration efforts.

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