基于“山西2015速度模型”的定位方法对比研究

A Comparative Study on the Positioning Method Based on “Shanxi 2015 Velocity Model”

为了确定山西台网基于"山西2015速度模型"的相对固定的定位方法,选择2010~2016年最大空隙角小于45°、参与定位台站数大于40的103个地震事件,分别采用单纯形法、Hypo2000、Hyposat结合PTD等3种方法重新测定。结果显示,单纯形法和Hyposat结合PTD测定的残差以及网缘地震的震中距两方面均优于Hypo2000;在震源深度方面,Hyposat结合PTD的结果较为可信。综合分析认为,基于"山西2015速度模型"定位地震时,山西台网应固定使用Hyposat结合PTD的方法。

In order to determine the relative fixed positioning method of Shanxi station’s speed model based on the “Shanxi 2015 velocity model”, 103 earthquake events with the maximum clearance angle of less than 45° from 2010 to 2016 and more than 40 positioning stations are selected as targets. The results show that the residuals of the simplex method and Hyposat combined with PTD determination and the epicenter distance of the net margin earthquake are superior to that of Hypo2000 and of Hyposat binding PTD in terms of focal depth.According to the comprehensive analysis, when the Shanxi 2015 velocity model is used to locate the earthquake, the Shanxi network should be fixed with Hyposat and PTD method.