Semiannual technical summary rept. 1 Jul-31 Dec 1965
MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
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The experimental Large Aperture Seismic Array LASA in Montana was put into operation and has been used for routine monitoring and data recording. Most of the physical elements of the system are working more reliably than had been anticipated. Research and experimentation with various array processing techniques are under way using LASA data. Results on automatic event detection and location are discussed. Both these sets of investigations are approaching the point at which the LASA capabilities can be established, the signal processing hardware design can be finalized, and a design of a possible global network of LASAs can be worked out, should it be needed. The large array is a signal improvement system whose outputs are to be used for nuclear test monitoring and research on the solid earth. Early results are reported. Two miscellaneous studies of seismic instrumentation are reported a survey of electromagnetic means of measuring long-baseline earth strains, and a comparative critique of the noise performance of several methods of amplifying near DC signals. A cumulative list of publications in this program is also presented.
- Seismic Detection and Detectors