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Extra resources for Advances in Geophysics, Supplement 2 Principles and Applications of Microearthquake Networks

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1973) found that predominant frequencies of oceanic microearthquakes were largely in the 20-Hz range. This required no modification of the frequency response characteristics of most hydrophones. They stated that their system could detect magnitude zero earthquakes at a distance of about 10 km. If the sonobuoy has a life of a few days, and if the array is close to land, then the expense of a ship standing by just to record the data may be avoided by anchoring sonobuoys to the ocean bottom and recording on land.

The locations of the theoretical corner frequencies for earthquakes from magnitude 0 to 6 are shown by arrows in this figure. All the response curves are stylized; each is represented by a small number of linear segments. This is sufficient for the present discussion and is an accepted way to diagram frequency response (Willmore, 1961). The theoretical ground displacement curves in Fig. 4 do not include the effects of the radiation pattern at the source, absorption and scattering along the transmission path, and conditions at the recording site.

The multiplexed signals sent to the discriminators do not go through any signal conditioning circuits (Fig. 7). Before the multiplexed seismic signals are recorded on analog tapes, each has three additional signals combined with it (Jensen, 1976a). 5 Hz. It is used in a subtractive compensation mode on playback. 50 Hz. 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.

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