Some problems of Seismic Data Processing. Part I. Observational System and Instrumentation

Abstract

As the first stage of the seismic data processing, the system set up at our Laboratory and Observatory for seismic data collection and processing are described. In the short-period seismograph system, seismic data are recorded on magnetic tape in analog form and then converted to digital form after selecting the data length and sampling rate. To record only desired data the time-delay equipment with IC-shift registers is adopted. Digitization is carried out by means of a DATAC-1030 digital system. For the long-period seismograph system, a direct digital recording system is used. The system consists of a 3-component set of long-period seismometers, DC-amplifiers, active RC filter networks, digital voltmeters, and a digital printer with 21 figures. For the triggering circuit the low-pass filtered component from the short-period vertical seismograph is used. Some examples of records obtained by these systems are shown.