Principles and Applications of Microearthquake Methods by H.E. Landsberg (Eds.)

By H.E. Landsberg (Eds.)

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The sonobuoy itself floats on the surface, while the hydrophone is suspended below at a depth of 20-100 m. Pressure variations in the water are detected by a piezoelectric crystal, amplified, and transmitted by cable to the sonobuoy. 4. Ocean-Bused Microecirthqicctke Systems 43 etry to a central recording site. Typically the central site is a nearby ship, but for short-lived systems aircraft can be used. A land-based recording site can be used if the sonobuoy array is sufficiently close to land.

The stylized frequency response of the complete system (Fig. 9L-N) is obtained by adding the logarithm of the seismometer response (Fig. 9H) to that of the three recording media and electronics (Fig. 91-K). Although Fig. 9L shows that the peak response of the tape recorder is at 30 Hz, the measured peak response is at 22 Hz. The measured peak response of the Develocorder and Helicorder systems is at 14 and 5 Hz, respectively. 2. Field Package The field package (Fig. 10) contains a seismometer, amplifier, voltagecontrolled oscillator (VCO), center-frequency stabilizer, automatic Calibration unit, power supply, and telemetry interface.

These signals are recorded on each track in order to eliminate some sources of timing error and to increase signal-to-noise ratio upon playback of the tape. /sec (Fig. 8). 2. Central Culifornia Microearthquake Network 31 (1977) showed that the frequency spacing between the timing and compensation subcarriers must be greater than that for the seismic data subcamers. 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.

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