THE OBSERVATION ACCURACY IMPROVEMENT OF DSQ WATER TUBE TILTMETER OF SHEXIAN SEISMIC STATION AFTER CAVE RECONSTRUCTION

The DSQ water tiltmeter is build during the "Ninth Five-Year Plan".The results of baseline extending and cave further airproof indicate that the length of the baseline is crucial to the observation accuracy besides the geological condition of the station,the topography of the observation site and the cave condition.Cave airproofing and background noise reducing can improve the observation accuracy to some extent and provide the observation system a stable and reliable condition.