A mobile seismograph array

Creators: Lehner, Francis E.; Press, Frank

Abstract

A movable array composed of Ranger type seismometers, 60-day film recorders and 7-day magnetic tape recorders housed in compact trailers, has been developed. The array is useful for research requiring frequent instrument relocation such as P-delay, micro-seismicity, aftershock and signal-to-noise ratio studies. The array unit combines the functions found in conventional fixed stations with a high degree of mobility. Conveniences such as solid state amplifiers, radio and clock circuitry, internal calibration, and minimum installation time are special features. With the battery supply provided, a one week period of unattended film and tape recording is possible. With commercial power, the instruments can operate unattended for up to sixty days. Useful magnification up to several million is available, depending on the frequency band selected.

Additional Information

Copyright © 1966, by the Seismological Society of America. Manuscript received December 15, 1965. This research was supported by the Advanced Research Projects Agency and was monitored by the Air Force Office of Scientific Research under Contract AF-49(638)-1337. Designs of some of the equipment units, modification of others, and many useful suggestions were contributed by members of the Seismological Laboratory staff. Particular credit is due Mr. Nat Motta, Mr. Wayne Miller, and Mr. Witold Krynicki. We wish to thank the U.S. Forestry Service, the Los Angeles Department of Water and Power, the Brigade Trails Camping Association, Mr. Harry Hauser, Mr. and Mrs. Jerry Miller, the Sawmill Ranch and Munz Ranch, for cooperation in situating the initial array.

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