山西地区震源新参数间关系初探
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摘要
利用"十五"数字化后山西地震台网记录的612次M_L≥2.0地震,使用中国地震局地震预测研究所推广的中小地震新参数计算软件,计算其中148次事件的震源新参数,对地震矩、矩震级、震源破裂尺度、应力降、拐角频率等参数间的定标关系做初步研究,得出M_L震级与地震矩、矩震级间存在较好的线性正相关;震级与震源尺度间存在多项式关系;与应力降的对数呈显著正相关,当大于M_L 4.0后,随着震级的增大,释放的应力降略有变缓;与拐角频率的对数呈负相关。
In this paper,mainly using 612 earthquake events of M_L≥2.0 recorded by Shanxi digital network in "the tenth-five year plan," and the calculation software provided by China seismological" bureau earthquake prediction research institute for small and medium-sized earthquake new parameter,the new source parameters of 148 events are calculated,a primary research on scaling relation among parameters of seismic moment,moment magnitude,source fracture scale,stress drop,corner frequency etc are made.The concludes are that M_L has well linear positive correlation with seismic moment and moment magnitude;polynomial relationship with source scale;obviously positive correlation with the logarithm of stress drop,which will be released a little more slowly with the increase of the magnitude if M_L≥4.0;negative correlation with the logarithm of corner frequency.This result does not show significant relationship between stress drop and source scale.But from here we can have more thoughts,giving new theoretical explanation of two controversial earthquake events.
引文
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