摘要
在波谱分析的基础上,对广东地区75个地震的波谱和震源参数进行了研究和探讨,侧重研究了它们与地震强度的关系,初步结果表明地震波谱和震源参数的震源半径,地震矩,应力降,平均位错,环境剪切应力,它们与地震的震级的相关性十分密切,主要表现在当震级小于ML3.8时,应力降、平均位错、环境剪切应力的对数跟震级呈现明显的正相关,而拐角频率、震源半径则与震级无关;反之,当震级大于ML3.8时,拐角频率、震源半径的对数则与震级又表现出很强的相关性,而应力降、平均位错、环境剪切应力与震级相关性不显著。上述结果说明,用地震波谱和震源参数开展地震预报研究必须十分注意它们与地震强度彼此的相关性问题,否则会对异常的判别造成很大的影响,从而得出错误的结果。
Based on spectral analysis of moderate and small earthquakes,the source spectral parameters and the source parameters of 75 earthquakes which occurred in 1999～2003 in Guangdong had been calculated using digital records.Furthermore,the correlation between the magnitude of earthquakes and all parameters are discussed.The results show some correlation.The stress drop Δσ ,average dislocation u or regional shear stress value τ 0 increase with magnitude increasing for M L≤ 3.8 ,but the correlation between the magnitude and corner frequency f 0 or the source radius a is weak. However,the correlation of the corner frequency f 0 or the source radius for greater earthquake with magnitude M L> 3.8 are strong,but the correlation between the magnitude and the stress drop Δσ ,average dislocation u or regional shear stress value τ 0 are weak.These results indicate that when predict earthquake using these parameters,these correlations should be noticed.Otherwise,it may produce incorrect prediction conclusion.
出处
《地震地磁观测与研究》
2004年第6期41-48,共8页
Seismological and Geomagnetic Observation and Research
关键词
地震波谱
震源参数
地震预报
广东地区
seismic spectral,seismic source parameter,earthquake prediction,Guangdong area
