湖北省潮汐形变观测异常及干扰识别  

ANOMALY RECOGNITION OF TIDAL DEFORMATION AND DISTURBANCE FACTORS IN HUBEI PROVINCE

作　　者：孙伶俐[1,2] 李明 蒋玲霞[1,2] 罗俊秋[1,2] 戴苗[1,2] 马武刚[1,2] 

机构地区：[1]湖北省地震局,武汉430071 [2]中国地震局地震研究所(地震大地测量重点实验室),武汉430071

出　　处：《大地测量与地球动力学》2013年第A01期36-40,共5页Journal of Geodesy and Geodynamics

基　　金：中国地震局三结合课题(1829-02);武汉市科技计划项目[2013060501010166];中国地震局震情跟踪合同制项目(2011020205;2012020304);中国地震局地震研究所所长基金(IS200946086)

摘　　要：对2003—2013年湖北省数字化定点形变潮汐观测中的突跳、阶变、震颤等异常的分析发现,气象因素对形变潮汐观测的影响复杂:1)不同气压场控制影响形变观测的异常形态不同,但响应频率一致;2)台风对形变观测的秒值和分钟值数据在1～4秒和2～4分钟较高频段均有响应;3)台址条件不同,降雨对形变观测产生的畸变影响不同。影响范围一般在0～全日波频段且存在较大的噪声;4)短时大气温度变化对形变观测有一定影响,会使曲线发生抖动或暂态波动,在64～128分钟和128～256分钟较低频段上有响应。水库冲沙、水库蓄水、土石开挖等环境荷载变化对分钟值观测曲线产生明显阶跃、抖动型实时畸变。人员进洞、施工、仪器标定检修等人为活动对观测曲线的影响可直接识别。We scanned the anomaly phenomenons including rush kick, step change, tremor, etc. on digital fixed-deformation tidal data in Hubei province from 2003 to 2013. Meteorological factors had complicated impacts on the deformation tidal data： 1 ）Different pressure fields had different abnormal morphology in deformation observa- tion, but they had the same response spectrum; 2）The response of typhoon to deformation observation lied in sec- ond and minute sampling data on higher frequency from 1 to 4 seconds and 2 to 4 minutes ; 3 ） Different environment of observation sites could receive different distortion signals. The spectrum ranged from 0 to diurnal wave had large noise; 4）Atmospheric temperature changes at short time had certain effect on data with quiver or transient fluctua- tion, and response on low frequency from 64 to 128 minutes and 64 to 256 minutes. Environment changes as sand scouring, reservoir storage change, surface load change would produce real-time distortions of step and jitter type on the tidal observation data. In addition, human activities effects involved personnel into the hole, construction, instrument calibration and repair etc. could be identified directly.

关 键 词：定点形变 潮汐观测 干扰因素 响应频率 气象 

分 类 号：P315.725[天文地球—地震学]