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地震 ›› 2003, Vol. 23 ›› Issue (1): 70-76.

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数字化形变观测提取的地震短临异常特征

张晶, 牛安福, 高福旺, 吉平   

  1. 中国地震局分析预报中心, 北京 100036
  • 收稿日期:2002-05-13 修回日期:2002-06-28 出版日期:2003-01-31 发布日期:2021-12-21
  • 作者简介:张晶( 1963-), 女, 北京市人, 副研究员, 主要从事重力、GPS资料分析及地震预报等研究。
  • 基金资助:
    “十五”国家科技攻关项目( 01-05-05)

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

ZHANG Jing, NIU An-fu, GAO Fu-wang, Ji Ping   

  1. Center for Analysis and Prediction, CSB, Beijing 100036, China
  • Received:2002-05-13 Revised:2002-06-28 Online:2003-01-31 Published:2021-12-21

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。

关键词: 数字化形变观测, 形变异常, 短临前兆, 阈值, 异常特征

Abstract: 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 techno logy before the Yong sheng 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 imagesprior to these earthquakes. The result s demo nstrated that the tidal-and non-tidal parameters and daily anomaly frequency might be possible to estimate the occur rence time and location for the future earthquakes.

Key words: Digital deformation observation, Imminent and short-term precursor, Kunlun mountain earthquake, Yongsheng earthquake

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