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 shortterm anomaly characteristics prior to some earthquakes. In this paper, we calculated and analyzed anomaly temporalspatial characteristics of tilt and gravity observation by the digital technology before the Yongsheng MS 6.0 earthquake, 27 Oct. 2001 and Kunlunshan MS 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 nontidal parameters and daily anomaly frequency might be possible to estimate the occurrence time and location for the future earthquakes.
出处
《地震》
CSCD
北大核心
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)
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
Digital deformation observation
Imminent and short-term precursor
Kunlun mountain earthquake
Yongsheng earthquake
