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利用新疆区域数字地震台网的波形资料,对2014年2月12日于田MS7.3地震前震和余震序列的频谱特征进行了分析。基于Brune模型,对观测记录进行仪器响应、传播路径和场地响应的校正,使用遗传算法对于田地震序列103次ML≥3.0地震的震源谱进行了反演计算。结果表明:1前震序列的拐角频率相对偏低,扣除地震矩影响后,余震的拐角频率有明显增高的趋势;2距离震中最近的YUT台资料分析显示,于田地震几次前震活动的台站观测谱相对较为独立,与主震以及彼此之间的相关系数均不高;3序列事件和主震的台站观测谱相关系数的变化反映了序列发展的动态破裂过程,相关系数较低的事件基本上偏离了主震破裂区而发生在分支断裂上;4前震的震源谱中存在异常的高频成份。
Based on the waveform data of Xinjiang regional digital seismograph network, the spectral characteristics of the pre-earthquake and aftershock sequences of the Yutian MS7.3 earthquake on February 12, 2014 were analyzed. Based on the Brune model, the instrument responses, propagation paths and site responses were corrected for the observed records. The source spectra of the 103 ML ≥ 3.0 earthquakes in the Tiantian earthquake sequence were retrieved by genetic algorithms. The results show that the corner frequency of the foreshock sequence is relatively low, and the corner frequency of the aftershocks tends to increase obviously after deducting the influence of the seismic moment. The recent YUT data analysis of the 2 epicentral distance shows that several stations of the fore-seismic activity of the Yutian earthquake The correlation spectrum between the observed events and the mainshock is not high. The changes of the correlation coefficients between the observed events and the mainshock reflect the dynamic rupture process of sequence development and the events with lower correlation coefficient Basically deviated from the rupture zone of the main shock and occurred on the branch fracture. 4 The anomalous high-frequency component of the source spectrum of the foreshock exists.