HR: 0800h
AN: S31B-1065    [Abstracts]
TI: MINEMOTION3D: A new set of Programs for Predicting Ground Motion From Explosions in Complex 3D Media
AU: * Tibuleac, I M
EM: ileana@westongeophysical.com
AF: Weston Geophysical Corporation, 57 Bedford Str., suite 102, Lexington, MA 02420 United States
AU: Bonner, J L
EM: bonner@westongeophysical.com
AF: Weston Geophysical Corporation, 57 Bedford Str., suite 102, Lexington, MA 02420 United States
AU: Orrey, J L
EM: Jeff.Orrey@vexcel.com
AF: Vexcel Corporation, 4909 Nautilus Ct, Boulder, CO 80301-3242 United States
AU: Yang, X
EM: xyang@lanl.gov
AF: Los Alamos National Laboratory, The Geophysics Group P. O. Box 1663, MS D443, Los Alamos, NM 87545 United States
AB: Predicting ground motion from complicated mining explosions is important for mines developing new blasting programs in regions where vibrations must be kept below certain levels. Additionally, predicting ground motion from mining explosions in complex 3D media is important for moment estimation for nuclear test treaty monitoring. Both problems have been addressed under the development of a new series of numerical prediction programs called MINEMOTION3D including 1) Generalized Fourier Methods to generate Green's functions in 3D media for a moment tensor source implementation and 2) MineSeis3D, a program that simulates seismograms for delay-fired mining explosions with a linear relationship between signals from small size individual shots. To test the programs, local recordings (5 - 23 km) of three production shots at a mine in northern Minnesota were compared to synthetic waveforms in 3D media. A non-zero value of the moment tensor component M12 was considered, to introduce a horizontal spall component into the waveform synthesis when the Green's functions were generated for each model. Methods using seismic noise crosscorrelation for improved inter-element subsurface structure estimation were also evaluated. Comparison of the observed and synthetic waveforms shows promising results. The shape and arrival times of the normalized synthetic and observed waveforms are similar for most of the stations. The synthetic and observed waveform amplitude fit is best for the vertical components in the mean 3D model and worst for the transversal components. The observed effect of spall on the waveform spectra was weak in the case of fragmentation delay fired commercial explosions. Commercial applications of the code could provide data needed for designing explosions which do not exceed ground vibration requirements posed by the U.S. Department of the Interior, Office of Surface Mining.
DE: 7219 Nuclear explosion seismology
DE: 7223 Seismic hazard assessment and prediction
DE: 7260 Theory and modeling
DE: 7294 Instruments and techniques
SC: Seismology [S]
MN: 2004 AGU Fall Meeting