数字化形变观测提取的地震短临异常特征  

On the imminent and short-term characteristics of earthquake anomalies obtained from the digital deformation observations

作　　者：张晶[1] 牛安福[1] 高福旺[1] 吉平[1] 

机构地区：[1]中国地震局分析预报中心,北京100036

出　　处：《地震》2003年第1期70-76,共7页Earthquake

基　　金：十五"国家科技攻关项目(01-05-05)

摘　　要：数字化形变资料由于采样率的大幅度提高,丰富了潮汐观测的震前变化信息,使研究震前短临的异常信息成为可能。通过对2001年10月27日永胜6.0级地震以及2001年11月14日昆仑山口西8.1级地震前后若干倾斜、重力数字化观测的结果进行计算分析,初步获得了两次地震前形变异常的阈值及临震异常特征图像。对临近地震前形变异常时间、空间上的特征进行总结。依据固体潮汐观测模型计算潮汐、非潮汐参数与日异常频次、日差分异常频次,将各参数综合考虑,有可能对未来发震的时间及地点给出预估计。The increment of sampling rate in the digital deformation observations provides us a possibility to detect and study the imminent and shortterm anomaly characteristics prior to some earthquakes. In this paper, we calculated and analyzed anomaly temporalspatial characteristics of tilt and gravity observation by the digital technology before the Yongsheng MS 6.0 earthquake, 27 Oct. 2001 and Kunlunshan MS 8.1, 14 Nov. 2001, and have obtained the thresholds for anomaly identification and anomaly images prior to these earthquakes. The results demonstrated that the tidal and nontidal parameters and daily anomaly frequency might be possible to estimate the occurrence time and location for the future earthquakes.

关 键 词：数字化形变观测 形变异常 短临前兆 阈值 潮汐 地球固体潮 

分 类 号：P315.725[天文地球—地震学]