HR: 1340h
AN: S43B-1309    [Abstracts]
TI: Demonstration of the "Point Seismic Array" Concept Using Co-Located Rotational and Translational Sensors
AU: * Abbott, R E
EM: reabbot@sandia.gov
AF: Sandia National Laboratories, Energetic Experiments and Dynamic Materials Dept., P.O. Box 5800, Albuquerque, NM 87185-1168, United States
AU: Aldridge, D F
EM: dfaldri@sandia.gov
AF: Sandia National Laboratories, Geophysics Dept., P.O. Box 5800, Albuquerque, NM 87185- 0750, United States
AU: Hart, D
EM: dhart@sandia.gov
AF: Sandia National Laboratories, Ground Based Monitoring R & E Dept., P.O. Box 5800, Albuquerque, NM 87185-0404, United States
AB: Spatially distributed arrays of multi-component sensors are commonly used to infer the speed, direction, and type (compressional or shear) of incident seismic waves. Recent developments in seismic wave propagation theory indicate that coincident (in space and time) measurements of both three-component translational and three- component rotational motions provide all the necessary information to calculate these parameters. Thus, the spatially extended array, with all its attendant deployment, operational, and post-acquisition data processing issues and problems, may be dispensed with. We present the results of theoretical, numerical, and field data acquisition experiments (the latter using an Eentec R-1 rotational seismometer and vibroseis truck energy source) to demonstrate the concept of the "point seismic array". Preliminary observations suggest that the back- azimuth to the vibroseis source may be inferred reasonably accurately via cross-correlating the measured horizontal acceleration and vertical torsion. Scaling these two measurements leads to an estimate of the wave speed. Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy's National Nuclear Security Administration under contract DE-AC04-94AL85000.
DE: 0594 Instruments and techniques
DE: 3285 Wave propagation (0689, 2487, 4275, 4455, 6934)
DE: 7200 SEISMOLOGY
DE: 7294 Seismic instruments and networks (0935, 3025)
SC: Seismology [S]
MN: 2007 Fall Meeting