2006年在清理核实云南省地震前兆观测数据过程中,发现澄江地震局水平摆仪2002年的观测数据与前后两年的差异较大,经过逐一落实,找出差异大的原因,揭示数据处理的重要性.%The obvious difference between the observation data of horizontal pendulum at Earthquake Administration of Chengjiang City, Yunnan Province, China, in 2002 and that in 2001 as well as in 2003 is discovered during 2006 when the authors clear up all the earthquake precursory observation data. After verifing meticulously, the authors found the reason of difference mentioned above, and exposed the importance of observation data processing.
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