由良における地球潮汐の観測(観測システムと潮汐定数)

Abstract

Telemetering system for monitoring crustal deformations has started into operation in Oc-tober 1982 at the Yura Observation Station, Wakayama Prefecture. Twenty-four signals ofcrustal strains and tilts observed with strainmeters and tiltmeters, and of other geophysical dataare transmitted to the Disaster Prevention Research Institute by a telephone line with the datasignalling rate of 50 bits/sec.In this paper, firstly the structures of observing instruments and their electronic circuitsare described. Both the magnetic sensors and differential transformers are adopted as trans-ducers of strainmeters and tiltmeters. Secondly tidal factors obtained by using the data fromOctober 6, OOhOOm to December 31, 23h00m, 1984 are shown. It has become clear that thevalues expressing the ratio of observed to theoretical amplitudes for M2 constituent distributein the range of 0.3-2.6.