Advances in Geophysics, Supplement 2 Principles and by Xxx Lee

By Xxx Lee

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Example text

This made it practical to add two important functions to the field package-automatic calibration for the entire system and center frequency stabilization for the VCO unit. A daily calibration sequence initiated by the field package interrupts the seismic data transmission and is recorded at the central site (Van Schaack, 1975). The sequence is about 40 sec long. It begins with a pulse-heightmodulated code that provides a unique serial number for the field package. This is followed by a seismometer release test and an amplifier step 28 2 .

5-Hz galvanometer accounts for the highfrequency roll-off in the Develocorder response. 1 and 5 Hz. Figure 91-K shows the combined response of the electronics and recording media-in other words, of everything but the seismometer. Because the Oscillomink response (Fig. 9E) is flat to well beyond 100 Hz,the 2 . 2 . Central Culijbrniri Microerirthyrrcike Netwwk 27 combined response (Fig. 91) may be considered to represent that of the analog tape recorder as well. Figure 91-K shows that the tape recorder has the broadest frequency response of the three recording media.

Although the system had only enough magnetic tape for about 7 hr of continuous recording, the triggering technique for event recording allowed the system to operate on the sea floor for one month or more. Typically, several hundred earthquakes could be recorded in a single drop of the instrument. Prothero (1979) developed a pop-up OBS system which he stated was versatile, low cost, and easy to deploy. 5-Hz natural frequency), gainranging amplifiers, a 12-bit analog-to-digital converter, a microprocessor controller, a digital cassette recorder, and an acoustic release unit.

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