By Xxx Lee
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Extra info for Advances in Geophysics, Supplement 2 Principles and Applications of Microearthquake Networks
Within the frequency range of 1-15 Hz,the spectral amplitude of the background noise was about 11300 to I/lOOO of that observed at the surface. This noise level was small even when compared with that from other Japanese stations located in quieter areas. 2. I . 3. 19 Instrumental Response The frequency response of a seismic system describes the relative amplitude and phase at which the system responds to ground motions as a function of frequency. The dynamic range is the ratio of the largest to the smallest input signal that the system can measure without distortion.
Major effort has gone into ( 1 ) making the field package low power, compact, longlived, and weather resistant; (2) increasing signal-to-noise ratio throughout the system; (3) understanding the frequency response of the entire system and its primary components; and (4) improving timing resolution and precision. In cooperative programs with other institutions, equipment similar to that in the USGS Central California Microearthquake Network has been used widely in the United States and some other countries as well.
If the field package output cannot be connected to a drop, it is transmitted via line-of-sight vhf radio to a convenient drop and transmitted from there using the telephone system. As many as eight seismic signals are carried along one voice-grade circuit. This is accomplished by frequency division multiplexing (FDM), as follows. Voice-grade lines transmit audio signals in the frequency range of 30&3300 Hz. In our system of FDM the usable bandwidth is divided into eight FM subcarriers, each with a uniquely specified center frequency.
Advances in Geophysics, Supplement 2 Principles and Applications of Microearthquake Networks by Xxx Lee