光波による地殻変動観測の精度について

Abstract

The accuracy of the electro-optical distance measurements by an AGA Geodimeter for the pur-pose of the observation of crustal deformations is statistically estimated from the measured valuesfor 3 years. Standard error of final result Lm' is 5.62 mm which consists of random error 2.20 mmand systematic delay line error 5.17 mm. But revision of the calibration tables decreases the latterto 3.41 mm. It means that repeated revisions of the calibration table ensure the accuracy of ±(3-4) mm.An approach to estimate temperature distribution on the topographic profile for the accuratemeteorological correction is tried. It is suggested that the correction to the accuracy comparable tothe machine error will be possible by the temperature measured on the ground.Measurements with high accuracy in the crustal deformation observatory are also reported.