Abstract:In this paper, the environment around Jixian seismostation and instrument work state is investigated with respect to the water tube tilt-meter’s accelerated incline to north direction from 1st April. Results are as follows: (1) The sensor at the north end was replaced at 31st March in 2014. Similarly, the accelerated incline to western direction began after replacing the sensor at western end in April 2009, which confirms that replacement of the sensor will influence water tube measurement to some extent. (2) Yuqiao reservoir to the south of Jixian seismostation discharged from April 1st to 11th with a velocity as high as 50 m3/s, the maximum rate over the past years. Short term accelerated incline to the north began when reservoir discharged fast. (3) The average discharge rate drastically exceeds the reservoir threshold calculated using a 3D concentrated load model and the calculated incline data in a horizontal direction is consistent with the real change of water tube data and vertical pendulum tilt-meter at Xiaoxinzhuang cave, which confirms the influence of reservoir using quantitative method. (4) Water tube continued accelerated inclining to north until mid-May, though Yuqiao reservoir was storing after April 11th. Duration and range of anomaly exceed the real change time and calculated result. Therefore, the accelerated incline to the north direction from April 1st in 2014 reflects influence of sensor replacement and discharge of Yuqiao reservoir.
ZHANG Lei,SHAO Yongxin,CAO Jingquan et al. Analysis of Acceleration Incline to North Direction of Water Tube Tilt-meter at Jixian Seismostation
[J]. jgg, 2016, 36(4): 372-376.