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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 | |
| 引用本文： | 刘红桂,顾瑾平,南金生,马建军.张北-尚义地震震前阶段中小地震速度谱周期特征的研究[J].地震,2000,20(3):53-60. |
| 作者姓名： | 刘红桂 顾瑾平 南金生 马建军 |
| 作者单位： | 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 |
| 基金项目： | 中国地震局“九五”科研攻关项目!( 95-0 4 -0 5-0 2 -0 5)部分成果 |
| 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 |
| 收稿时间： | 1999-11-22 |
| 修稿时间： | 2000-01-14 |
Research on the property of micro earthquake velocity spectrum in the stage before Zhangbei-Shangyi strong earthquake |
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| LIU Hong-gui,GU Jin-ping,NAN Jin-sheng,MA Jian-jun.Research on the property of micro earthquake velocity spectrum in the stage before Zhangbei-Shangyi strong earthquake[J].Earthquake,2000,20(3):53-60. | |
| Authors: | LIU Hong-gui GU Jin-ping NAN Jin-sheng MA Jian-jun |
| Institution: | 1. Seismological Bureau of Jiangsu Province, Nanjing 210012, China; 2. Center for Analysis and Prediction, CSB, Beijing 100036, China |
| 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 the 0.5 octave filter group is adopted, in which each central period is 0.04s, 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 3 components 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. |
| Keywords: | Blue earthquake Synthetic factor Velocity spectrum Corner frequency |
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