数字化台网中定位子台网选取对定位结果的影响

选取山西及邻区不同区域的33个地震事件,通过分析"定位子台网"分布对地震定位精度的影响,研究"定位子台网"的选取。分区域分别探讨两种台站分布情况下的定位偏差、水平误差、拟合残差随空隙角、近台距离、远台距离的变化,以及定位偏差与拟合残差的关系。结果显示,速报时选取9~12个台站,且台站分布相对合理的"定位子台网"参加定位结果比较好,使用水平误差估计定位结果的效果较理想。

Influence of Sub-network Selection in Digital Seismic Network on the Focus Locating

Selecting 33 earthquakes occurred in different areas of Shanxi Province and its adjacent regions ,how to select the best sub-network for focus locating is studied based on analyzing the influence of locating network distribution on the accuracy of earthquake location .The locating deviation ,horizontal error ,fitting residual with clearance angle ,variation with distances of near station and far station ,and relation of locating deviation with fitting residual of two types of station distribution were discussed in different re-gions ,respectively .The result indicates that it is suitable to select a sub-network including 9 to 12 rational distributed station for fo-cus locating in rapid report .It is relatively suitable to evaluate the quality of the locating result with horizontal error .