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地震

地震 ›› 2000, Vol. 20 ›› Issue (3): 53-60.

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张北-尚义地震震前阶段中小地震速度谱周期特征的研究

刘红桂1, 顾瑾平2, 南金生1, 马建军1   

  1. 1.江苏省地震局,江苏 南京 210014;
    2.中国地震局分析预报中心,北京 100036
  • 收稿日期:1999-11-22 修回日期:2000-01-14 出版日期:2000-07-31 发布日期:2022-09-30
  • 作者简介:刘红桂（1966-）,男,湖南娄底人,助理研究员,1995年获硕士学位,主要从事地震波方法的抗震减灾应用及地震预报研究。
  • 基金资助:
    中国地震局“九五”科研攻关项目（95-04-05-02-05）部分成果

Research on the property of micro earthquake velocity spectrum in the stage before Zhangbei-Shangyi strong earthquake

LIU Hong-gui1, GU Jin-ping2, NAN Jin-sheng1, MA Jian-jun1   

  1. 1. Seismological Bureau of Jiangsu Province, Nanjing 210012, China;
    2. Center for Analysis and Prediction, CSB, Beijing 100036, China
  • Received:1999-11-22 Revised:2000-01-14 Online:2000-07-31 Published:2022-09-30

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摘要： 从 Duda 和 Nortmann 提出的谱震级定义出发,利用北京台网中小地震速度数字化记录资料,采用14组0.5倍频程滤波器组,其中心周期为:0.04s、0.06s、0.08s、0.12s、0.18s、0.28 s、0.40s、0.60s、0.96s、1.28s、2.40s、3.80s、6.20s、10.00s,分别计算了各中小地震的速度 谱综合因子f值,结果显示张北-尚义地震震前阶段中小地震的三分向速度谱卓越频率向高频 方向偏离,综合因子 f 值逐渐增加,且蓝地震的发生有向主震震中靠拢的趋势。同时,研究认为 综合因子 f 值可以量化蓝地震的定义。

关键词: 蓝地震, 速度谱, 综合因子, 拐角周期

Abstract: Based on the definition of the spectrum magnitude,using the digital data of micro events recorded by Beijing seismic network the synthetic factor f-value for every event is calculated.In this calculation the0.5octave filter group is adopted,in which each central period is0.04s,0.06s,0.08s,0.12s,0.18s,0.28s,0.40s,0.60s,0.96s,1.28s, 2.40s,3.80s,6.20s,10.00s,respectively.The result indicates that the corner frequency of velocity spectrum for 3components of micro earthquakes is deviated from the high frequency direction in the stage before Zhangbei-Shangyi strong earthquake and synthetic factor f-value is increased with time.Epicenters of those blue earthquakes show a tendency to approach to the epicenter of the strong earthquake gradually.It is considered that the definition of blue earthquake could be quantified by synthetic factor f-value.

Key words: Blue earthquake, Synthetic factor, Velocity spectrum, Corner frequency

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