双子地震P波谱比在地震短期预报中的应用研究  

Research on Short Term Earthquake Prediction by P-wave Spectral Ratio of Earthquake Doublet

作　　者：王琤琤[1] 缪发军[1] 杨彩霞[1] 梅卫萍[1] 徐戈[1] 

机构地区：[1]江苏省地震局,南京210014

出　　处：《防灾减灾工程学报》2006年第4期395-403,共9页Journal of Disaster Prevention and Mitigation Engineering

基　　金：江苏省科技计划社会发展项目(BS2002069)

摘　　要：应用法国地震学家G.Poup inet等关于双子地震的有关理论,对云南地震台网数字地震资料开展应用研究,通过基线校正、数字滤波、波形对比等方法获得8对3级双子地震和武定地震易门台7对双子地震。对以上双子地震取起始3秒P波作富氏谱分析后进行谱比对数的斜率拟合。结果显示,由发生在6.5级姚安地震前7个月之内与之外时段的地震构成的双子地震,其P波谱比对数斜率绝对值都达到0.030以上,明显高于均由震前7个月之外发生的地震构成的双子地震谱比对数斜率;在距主震2°范围以内的台站可观测到双子波发生的变化。常熟台双子地震P波谱比对数斜率时间进程在南黄海地震发生之前也存在这一现象,但出现异常的时间扩大到9个月之内。We have studied the data from the digital earthquake net of Yunnan province using the earthquake doublet theory proposed by French seismologist G. Poupinet and his co-workers. Eight groups of multiplet and seven groups of doublet of Wuding earthquake have been obtained from observations at Yi- men station by baseline correction, digital filter and waveform contrast, etc. The Fourier transfermations of these doublets are calculated individually with respect to the initial 3s from the P-wave arrival and the slope of decimal logarithms of spectral ratios versus frequency is estimated. The results show that absolute values of P-wave spectral ratio slop are all more than 0. 030 for the earthquake doublets with one event occurring 7 months before the Yao＇an ML6. 5 earthquake and the other occurring outside that period, signifi cantly higher then the earthquake doublets preceding the Yao＇an earthquake by more than 7 months. The variation in spectral ratio slop is observed in a sector of azimuth around 2° of the main shock. The doublets observed on Changshu Station following the South Yellow Sea middle-intense earthquakes show sueh variations in spectral ratio slope, but the time scale of one event of the doublets extends to 9 months before the main shock.

关 键 词：双子地震 数字滤波 谱比 地震预报 

分 类 号：P315.31[天文地球—地震学]