以丽江地震台为例研究潮汐观测仪器格值变化检测及格值归化方法*
闫 伟1,陈国琴1,杨跃文2,王栋梁1

(1.中国地震台网中心,北京 100045; 2.云南省地震局 丽江地震台,云南 丽江 674100)

格值变化检测; 格值归化; 潮汐因子; 调和分析; 长周期趋势变化

Method of Scale Change Detection and Scale Calibration Illustrated by the Case of Tide Observation Instrument at Lijiang Seismic Station
YAN Wei1,CHEN Guo-qin1,YANG Yue-wen2,WANG Dong-liang1

(1. China Earthquake Networks Center,Beijing 100045,China)(2. Lijiang Seismic Station,Earthquake Administration of Yunnan Province,Lijiang 674100,China)

scale change detection; scale calibration; tide factor; harmonic analysis; trend change in long period

备注

针对形变固体潮汐类观测数据,提出了一种新的检测仪器格值变化的方法,即潮汐因子相除法,并从理论上推导了利用此方法检测由于格值变化引起潮汐因子变化的原理,同时还提出利用格值变化时间前后M2波潮汐因子比值作为系数进行格值归化的方法。最后,结合丽江地震台水平摆实际观测数据,验证了格值变化检测和格值归化方法的可行性,并论述了在分析数据长周期趋势变化前需进行格值检测和归化的重要性。

By analyzing the deformation earth tide observation data,we proposed the new method of dividing two tide factors(calculating the rate of two tide factor)to detect the scale change of instrument. Then we deduced the principle of detecting the tide factor change induced by the scale change by the new method in theory. We also put forward the method of scale calibration,that is the ratio of M2 tide factor before and after scale value change was taken as the coefficient to correct the scale. Finally,combing with the observation data of horizontal pendulum at Lijiang Seismic Station,we verified the feasible of the scale detection method and scale calibration method,and elaborated the importance of the scale detecting and calibration before analyzing the long-period trend changes of the data.