欢迎访问《地震》,

地震 ›› 2006, Vol. 26 ›› Issue (2): 113-122.

• • 上一篇    下一篇

云南地区余震序列的能量衰减

钱晓东, 秦嘉政   

  1. 云南省地震局, 云南 昆明 650224
  • 收稿日期:2005-09-25 修回日期:2005-11-08 出版日期:2006-04-30 发布日期:2021-11-01
  • 作者简介:钱晓东(1965-), 男, 云南通海人, 副研究员, 主震从事地震预报及数字地震等研究。
  • 基金资助:
    云南省重点科技攻关项目(NG2001); 云南西部地震监测防御中心建设(YN150105T037-045YN150105T037-045)项目资助

The energy attenuation of the aftershock sequence in Yunnan area

QIAN Xiao-dong, QIN Jia-zheng   

  1. Earthquake Administration of Yunnan Province, Kunming 650224, China
  • Received:2005-09-25 Revised:2005-11-08 Online:2006-04-30 Published:2021-11-01

摘要: 利用判断地震序列能量释放衰减是否异常的Ec-k量板, 计算了云南及附近地区39次中强地震序列的能量衰减系数k值, 结果显示: ① 当判别指标k>1时, 地震序列能量衰减处于正常状态; 当k≤1时, 判断地震序列能量衰减出现异常, 其后发生更大地震或强余震的可能性较大。 ② 对云南地区中强地震序列的检验表明, 有74%的地震序列符合上述判别指标。 ③ 用相同的地震进行了地震序列频度衰减系数h值的计算, 发现符合h值判别指标的地震序列占统计标本的59%。 ④ 对日常地震跟踪监视中遇到的二次典型地震序列详细分析, 发现用k值方法无论对中小地震序列还是巨震序列, 预测效果均较好。

关键词: 地震序列, 能量量板, 能量衰减系数

Abstract: Using Ec-k template chart which can be used to decide the energy that was released by seismic sequence, we calculated the k values of the attenuation coefficients of the 39 seismic sequences of moderately strong earthquakes. The results shows: ① While the k values are larger than 1, the energy attenuation of the seismic sequences is normal; While they are no more than 1, the energy attenuation of the seismic sequences is abnormal, the possibility of larger earthquakes or aftershocks occurring in the future is big. ② The examination of the moderately strong earthquakes shows that 74 percent of seismic sequences tally with the above-mentioned determined norm. ③ We have calculated the h values of the frequency attenuation coefficients of seismic sequences, and found that the 59 percent of seismic sequences tally with the determined norm of the h values. ④ We have also found that the predictive effect is much better by using the method of k value no matter that it is small or moderate seismic sequence or large, through detailedly analyzing the second typical seismic sequences we found in monitory tracing.

Key words: Seismic sequences, Energy template chart, Attenuation coefficient of energy

中图分类号: