Analysis of Anomaly Characteristics of Tilt Measuremennt Data from Changshu Seismic Station
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摘要: 在研究常熟台水管仪与垂直摆多年倾斜观测资料的基础上，利用潮汐因子调和分析、Nakai拟合检验、小波分析等方法对台站周边约250km范围内发生的高邮-宝应MS 4.9及如东近海MS 3.8等地震前的异常信息进行了提取，对数据异常分析方法进行评判，旨在为以后地震前及时发现地震提供参考。Abstract: Based on the year-observation data of vertical pendulum tilt and research of water pipe instrument in Changshu seismic station, we conducted the tide factor of harmonic analysis, Nakai test and wavelet analysis to extract the abnormal information of the range of 250km occurred near the station of the Gaoyou MS 4.9 and Rudong MS 3.8 offshore earthquakes. The abnormal data analysis method was evaluatedin order to find precursor reference before the earthquake in the future.
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Key words:
- Tilt observation /
- Water Tube meter /
- Vertical pendulum /
- Anomalies before earthquake /
- Analysis method
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图 1 常熟台水管仪垂直摆降雨干扰图
Figure 1. Interference diagrams of vertical pendulum andwater pipe system from Changshu seismic station
图 2 常熟台垂直摆南北分量倾斜加速异常图（20100703—2010708（a）、20120807—20120809（b））
Figure 2. Acceleration anomaly of vertical tilt of the north and south from Changshu seismic station
图 3 常熟台垂直摆南北分量M2波潮汐因子变化图
Figure 3. Variation of tidal factor of M2 wave of north-south component in vertical pendulum from Changshu seismic station
图 4 常熟台水管仪垂直摆非潮汐应变加速度
Figure 4. Accelerations of non-tidal strain of water tube meter and vertical pendulum from Changshu seismic station
图 5 常熟台水管仪垂直摆小波分解第7阶、8阶细节
Figure 5. The wavelet decomposition result at 7th and 8th level of water tube meter and vertical pendulum from Changshu seismic station
表 1 常熟地震台周边5次震例目录
Table 1. The records of 5 earthquake examples around Changshu seismic station
发震时间 震级/MS 震中距/km 发震地点 经度/° 纬度/° 20100709 3.8 134 如东近海 121.36 32.30 20100719 3.8 133 如东近海 121.36 32.27 20120720 4.9 207 高邮-宝应 119.34 33.01 20120825 4.3 252 南黄海 121.55 33.11 20140118 3.7 132 如东近海 121.36 32.27 
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