地震計による山鳴り現象計測装置について

抄録

The observations with the seismometer at Sunagawa Coal Mine started as the study entrusted from Coal TechnologyResearch Institute in 1971. Then processing and analyzing system owned by Coal Technology Research Institute were removed to Horonai Coal Mine in June 1980. So that, at this coal mine, we had recorded on only pen-recorders.
But meanwhile the credibility of systems was lost extremely because it became difficult to record on a pen-oscilograph owing to inferiority of signal transmission lines and increase of noises. In this time the hydraulic mining blocks were shifting to 860L, we had to enrich the measuring instruments of seismic events for the purpose of strengthing safety. The recording on penoscilograph became more correct as a result of carring out immediately strengthing and renewing the signal transmission lines and decreasing noises.
We tried the automatic of signal processor after the improvement of signal transmission system. The system owned by Coal Technology Research Institute was so excellent as corresponding to academic study, but in this coal mine, we planed to simplify the obtained data by means of the minimum processing i.e. a seismic source location and magnitude calculation. So that we made for the system to operate easily as one of centralized supervision.
In regard to the processing system, two microcomputers display their abilities which are equivalent to a minicomputer by connecting them in series. The former is in use for sampling the data and the latter for operation and controling peripheral equipments. We order the measuring instruments from electric works, and they are controled in our own program. It is easy for us to operate it in our place of work.