研究地震空区及条带附近地震破裂特征方法的误差讨论

ANALYSIS ON ERRORS IN STUDY ON THE FRACTURE FEATURE OF MODERATE AND SMALL EARTHQUAKES OCCURRED NEAR SEISMIC BELTS AND GAPS

较详细地讨论了确定中小地震破裂面方向和环境应力值方法的误差 .分析表明 ,引起破裂方向误差的主要因素是台站包围震中的张角和制作广义方向性函数理论量板的精细程度 .若对于θ角 (台站和震中的连线与主破裂方向之间的夹角 )每隔1 5°给出一条理论曲线 ,当台站包围震中张角大于 6 0°时 ,其误差可小于 1 5°.引起环境应力值τ0 相对误差的主要因素是震级误差 .若震级误差为 0 .3,可引起τ0 的相对误差为 70 % .

The errors of determining direction of fracture plane and environment stress of moderate and small earthquakes are analyzed in detail.The result shows that the main factors causing the error of determining direction of fracture plane are the field angle in which the stations are distributed and the precision of making the theoretical master for the generalized directional function.If the theoretical curve is given for every 15°of θ, then the error can be less than 15°when the field angle is more than 60°.The main factor creating the relative error of the environment stress τ 0 is the magnitude error.If the magnitude error is 0.3,it may cause the relative error of the τ 0 to reach 70 %.