HR: 1340h
AN: S43A-1058    [Abstracts]
TI: Analysis of Modern Techniques for Nuclear-test Yield Determination of NTS Events Using Data From the Leo Brady Seismic Network
AU: * Schramm, K A
EM: schramm@ees.nmt.edu
AF: New Mexico Institute of Mining and Technology, Dept. of Earth and Environmental Science, 801 Leroy Place, Socorro, NM 87801, United States
AU: Bilek, S L
EM: sbilek@ees.nmt.edu
AF: New Mexico Institute of Mining and Technology, Dept. of Earth and Environmental Science, 801 Leroy Place, Socorro, NM 87801, United States
AU: Abbott, R E
EM: reabbott@sandia.gov
AF: Sandia National Laboratories, Solid Dynamics and Energetic Materials Department, P.O. Box 5800, Albuquerque, NM 87185-1168, United States
AB: Nuclear test detection is a challenging, but important task for treaty verification. Many techniques have been developed to discriminate between an explosion and an earthquake and if an explosion is detected, to determine its yield. Sandia National Laboratories (SNL) has maintained the Leo Brady Seismic Network (LBSN) since 1960 to record nuclear tests at the Nevada Test Site (NTS), providing a unique data set for yield determination. The LBSN is comprised of five permanent stations surrounding the NTS at regional distances, and data (in digital from post 1983) exists for almost all tests. Modern seismic data processing techniques can be used with this data to apply new methods to better determine the seismic yield. Using m_b(Lg) we found that, when compared to published yields, our estimates were low for events over 100 kilotons (kt) and near the published value for events under 40 kt. We are currently measuring seismic-phase amplitudes, examining body- and surface-wave spectra and using seismic waveform modeling techniques to determine the seismic yield of NTS explosions using the waveforms from the LBSN.
DE: 7219 Seismic monitoring and test-ban treaty verification
SC: Seismology [S]
MN: 2007 Fall Meeting