欢迎访问《地震》,

地震 ›› 2007, Vol. 27 ›› Issue (3): 63-73.

• • 上一篇    下一篇

中原地区ML5.0左右地震前弱震活动异常指标

谢智1, 谢健健1, 文艳霞2, 杨显斌2, 龚倩1, 王文旭1   

  1. 1.河南省地震局, 河南 郑州 450016;
    2.郑州市地震局, 河南 郑州 450007
  • 收稿日期:2007-02-05 修回日期:2007-03-21 出版日期:2007-07-31 发布日期:2021-10-29
  • 作者简介:谢智(1941-), 男, 河南安阳人, 研究员, 主要从事地震活动性和地震预测等研究。
  • 基金资助:
    地震科学联合基金(306017)资助

Anomaly index of weak seismicity before the ML5.0 earthquakes in Henan Province and its vicinity

XIE Zhi1, XIE Jian-jian1, WEN Yan-xia2, YANG Xian-bin2, GONG Qian1, WANG Wen-xu1   

  1. 1. Earthquake Administration of Henan Province, Zhengzhou 450016;
    2. Earthquake Administration of Zhengzhou City, Zhengzhou 450007, China
  • Received:2007-02-05 Revised:2007-03-21 Online:2007-07-31 Published:2021-10-29

摘要: 对研究区内(31°~37°N, 110°~117°E)1970年至今的37年中全部16次ML5.0左右地震前弱震活动图像进行了研究。 结果表明, 震前出现的异常图像有地震窗口效应、 弱震空区、 地震丛集、 小震群活动、 弱震条带和地震空段等六种。 地震窗口效应和弱震空区重现率最高(均为0.75); 小震群活动和地震丛集重现率居中(分别为0.56和0.53); 地震空段和弱震条带重现率最低(分别为0.38和0.33)。 另根据这些异常的时间进程分析, 它们对研究区内未来ML5.0左右地震的预测可进行跟踪。 弱震空区或地震丛集可作为年度异常指标使用; 出现小震群活动, 可作为进入短期预测阶段的标志; 如地震窗口出现异常, 则可进一步确认进入短期预测阶段。 由此可见, 弱震活动异常图像对预测研究区内ML5.0左右地震具有一定的指示意义。

关键词: 地震预测, 弱震异常图像, ML5.0左右地震, 中原地区

Abstract: This paper studied the patterns of weak seismicity before all the 16 earthquakes with ML≈5.0 occurred during 1970—2006 in Henan Province and it vicinity. The results indicate that there are some anomalous seismicity patterns, such as the seismic window effect, weak seismic gap, seismic swarming, small earthquake swarm activity, weak seismic band and earthquake-free segment and so on. Among them, the recurrence rate of seismic window effect and weak seismic gap is highest (both are 0.75); the rate of small earthquake swarm activity and seismic swarming is middle (0.56 and 0.53, respectively) and the rate of earthquake-free segment and weak seismic band is the lowest (0.38 and 0.33, respectively). Besides, based on analysis of time process of those anomalies, the future earthquakes with ML≈5.0 are predicted. The weak seismic gap and seismic swarming can be used as the index for annual anomaly. The small earthquake swarms can be regarded as the mark for short term earthquake prediction. And there is anomaly of seismic window, which can be regard as entrance of short term earthquake prediction. Therefore, the activity pattern of weak seismicity is of significance in prediction of earthquakes with ML≈5.0 in Henan Province and its vicinity.

Key words: Earthquake prediction, Anomaly pattern of small earthquakes, ML5.0, Henan Province and its vicinity

中图分类号: