By Xxx Lee
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Extra info for Advances in Geophysics, Supplement 2 Principles and Applications of Microearthquake Networks
Analysis of seismic signals is easier by recording on digital magnetic tape. , 1980; Fletcher, 1980) and may soon become the standard recording instrument for microearthquake studies. 4. Ocean-Based Microearthquake Systems On a global scale most earthquakes occur near the ocean-continent boundaries. Because of the difficulties in carrying out experiments at sea, ocean-based microearthquake studies have been less extensive than those on land. Typically the ocean-based studies are reconnaissance in nature and involve only a few temporary stations.
The package is lowered to the sea floor by means of a cable. The cable usually is attached to an anchored buoy, although it may be attached to a ship. The instrument package must be isolated from the buoy and the cable to avoid vibrational noise. Rykunov and Sedov ( 1967) and Nagumo and Kasahara ( 1976) described cable systems in which the buoy was held in place by an anchor and ballast weights on the sea floor. The instrument package was 150-250 m from the anchor and was connected to it by a series of shackles and rope.
I sec requires interpolation. The 30-bit parallel time code generated by the time code generator has a resolution of 1 sec. Serial time codes are sent to the linear recording devices (Fig. 7): Helicorder, Develocorder, and magnetic tape recorders. The parallel time code is sent to digital devices: the on-line computer and other digital data acquisition devices (not shown in Fig. 7). 005 sec of universal time by daily comparison of the IRIG-C serial time code with the WWVB radio signal. Corrections are not made for radio propagation delay.
Advances in Geophysics, Supplement 2 Principles and Applications of Microearthquake Networks by Xxx Lee