联合采用Inglada算法和Geiger算法确定地震精确位置

Hypocenter Location by Using Combined Method of Inglada and Geiger Algorithms

Inglada定位算法具有全局反演地震位置的优点,但只能采用均匀地壳结构求解地震位置,Geiger定位算法能够采用不均匀地壳结构进行定位,但给定的真解必须在实际解附近才能得到全局最优的震源位置。本研究结合Inglada和Geiger算法的各自优点,提出了地震定位算法的策略,即先采用Inglada算法得到接近真解的初始震源位置,然后采用Geiger算法对Inglada算法得到的解进行修改,以便得到考虑不均匀速度模型的震源位置。数值试验表明这种策略可以很好地约束地震的位置。我们将该算法应用于2008年2月11日江西瑞金ML2.3地震,得到了残差更小的地震精确位置。

Global optimal solution of earthquake location can be obtained by using Inglada algorithms,but heterogeneous earth model cannot be considered in Inglada algorithms.However,heterogeneous earth model can be considered in Geiger algorithms,but local optimal solution of earthquake location may be obtained.We combined merit of Inglada and Geiger algorithms and provided a strategy to precisely locate earthquakes,i.e.the initial global optimal solution is obtained by using Inglada algorithms first,and then the solution is refined by using heterogeneous earth model and Geiger algorithms.The test with artificial data shows robust of this strategy.We applied it to Ruijin ML2.3 earthquake（on February 11,2008 in Jianxi Province） and got accurate location of the earthquake,which has less travel time residual.