湖北地区地震震源参数研究

Study on the Source Parameters of the Hubei Region

摘要:

为了研究湖北地区地震震源参数特征，本文基于湖北数字地震台网记录到的S波观测振幅谱，通过遗传算法获得湖北地区的介质品质因子和台站场地响应，并在此基础上计算了湖北地区地震震源参数。结果显示，湖北地区介质品质因子Q值随频率f变化的关系式为Q（f）=501.8·f^0.309；对于大部分台站获得了与其岩石基底相符的场地响应，没有出现明显放大效应；地震震级与地震矩对数间呈线性关系，即lgM₀=10.06+1.093M_L；震源半径与应力降间呈双对数线性关系，即lg△σ=10.52-2.01lgr；地震矩与拐角频率间整体上呈反相关；地震矩与应力降间关系不显著。

Abstract:

Based on the amplitude of S-wave spectrum recorded at the Hubei Telemetered Network,the paper studies the source parameter of the Hubei area. We use the genetic algorithm inversion to obtain the non-elastic damping coefficient and site response of each station,and calculate the source parameter of the Hubei area on this basis. The results show that the frequency dependent non-elasticity coefficient Q in the Hubei area is estimated as Q(f)=501.8·f^0.309 and most of the stations have no obvious amplification effect,which is consistent with the rock foundation. The earthquake magnitude is linear with the logarithm of the seismic moment:lgM₀=10.06+1.093M_L;focal radius and stress drop in double logarithmic linear relationship:lg△σ=10.52-2.01lgr,the relationship of seismic moment and corner frequency is negatively related to the whole;the relationship of seismic moment the earthquake stress drop is not significant.