By Xxx Lee
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Extra info for Advances in Geophysics, Supplement 2 Principles and Applications of Microearthquake Networks
The combined signals are recorded on Bell and Howell Model 3700B tape recorders, in direct-record mode. 4-mm) wide tape. 8 m d s e c ) requires that the standard 7200-ft- (2195-m) length tape be changed daily. Because each multiplexed signal can have eight seismic signals within it, each 14-track tape recorder can accommodate 112 seismic signals. At present four such recorders are used for the USGS Central California Microearthquake Network. 4. Timing Systems Radio signal WWVB of the National Bureau of Standards (broadcasting at 60 kHz) is taken as the primary time base.
Geological Survey. Because his method is applicable to other sys- 20 2. Ins trumentution Sys terns tems with appropriate substitution for certain parameters, it is discussed here in some detail. From seismic source theory one can calculate spectral amplitudes of ground motion for certain source models. These calculations illustrate the variation in frequency content that would be expected for earthquakes of varying magnitude and source characteristics. The output of a particular instrumental system may then be ascertained by combining the spectrum of the expected ground motion with the frequency response of the instrumental system.
A land-based recording site can be used if the sonobuoy array is sufficiently close to land. A major problem with sonobuoy arrays is determining the location of each unit so that precise hypocenters can be calculated. The drift of the sonobuoy units relative to each other further complicates the problem. Reid et (11. (1973) used an air gun aboard the recording ship to determine the relative sonobuoy position. The time delay between firing the air gun and the arrival of the direct water wave at the hydrophone gives the distance between the ship and the hydrophone.