LARGE APERTURE SEISMIC ARRAYS
Quarterly technical rept. no. 3, 15 Sep-15 Dec 1966
GENERAL ATRONICS CORP PHILADELPHIA PA
Pagination or Media Count:
A progress report on three topics that were studied during the third quarter of Contract AF19628-5981 is presented. Preliminary results on spectral estimates of seismic events are presented and two principal conclusions are suggested noise prediction is probably not a useful means of reducing the variability of spectral estimates, and, for the one large surface-focus event processed to date, there is a significant amount of signal energy above 4 Hz. The problem of detecting nuclear explosions in the presence of large natural events has also been considered during this period. This problem is discussed here, with the emphasis on the possibility of steering nulls at the natural events. Difficulties resulting from the sampled nature of the seismic records and from coda reverberations are also discussed in this context. Finally, the location of epicenters by beam splitting with a LASA is discussed. The technique is described, the sources of error are analyzed, and data from three seismic events are presented.
- Seismic Detection and Detectors