上宝地殻変動観測所の地殻変動・地震観測テレメータ・システム

Abstract

Central recording system for monitoring crustal deformations and seismic activities in thewestern Chubu region, Japan, by the use of digital telemetering device with time-division PCMmultiplex, has started into operation in May 1977 at the Kamitakara Crustal Movement Ob-servatory.Twenty signals of crustal strains and tilts (DC) observed with extensometers and tiltmetersand of some other geophysical data, and ten signals of short-period (SP) and long-period (LP)seismic waves observed at three satellite stations are telemetered to the Observatory by a telephoneline with the data signalling rate of 4800 bits/sec. The dynamic range of the signals is 78 db forthe SP and LP data, and 66 db for the DC data, respectively. The output signals are recordedin both analog and digital forms.Seven DC signals and three SP data are also transmitted in the same way to the DisasterPrevention Research Institute, which is about 200 km distant from the Observatory.Some of the recent observational results obtained from the telemetering system are presentedin this paper.