定位子台网的选取对定位结果影响研究
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摘要
选取了河北及邻区58个不同区域的地震,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”的选取规则。分别探讨了三种台站分布情况下定位偏差、水平误差、拟合残差随空隙角、近台距离、远台距离的变化;定位偏差以及水平误差与拟合残差的关系。结果显示,速报时选择7~9个分布相对合理的“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质量比较适合。
Selecting 58 earthquakes occurred in Hebei Province and adjacent regions,rules of subarray selection are studied based on analyzing the influence of station distributions on the accuracy of locating result.The locating deviation,horizontal error,fitting residual with clearance angle,variation with near station and far station,and relation of locating deviation with horizontal error and fitting residual were discussed separately.The results show that it is suitable to select 7 to 9 stations for earthquake locating in rapid report.It is relatively suitable to evaluate the quality of the locating result with horizontal error.
Selecting 58 earthquakes occurred in Hebei Province and adjacent regions,rules of subarray selection are studied based on analyzing the influence of station distributions on the accuracy of locating result.The locating deviation,horizontal error,fitting residual with clearance angle,variation with near station and far station,and relation of locating deviation with horizontal error and fitting residual were discussed separately.The results show that it is suitable to select 7 to 9 stations for earthquake locating in rapid report.It is relatively suitable to evaluate the quality of the locating result with horizontal error.
引文
[1]孟玉梅,赵永,王斌.中国地震观测台网地震速报定位偏差的分析[J].地震,2001,21(3):65-69.
[2]吕智勇,苏国君,韩渭宾.几种地震定位程序的定位效果分析[J].四川地震,2001,18(2):24-28.
[3]马宝柱,许静.乌鲁木齐遥测地震台网的速报定位[J].内陆地震,1997,11(4):350-360.
[4]中国科学院地球物理研究所.近震分析[M].北京:地震出版社,1977.
[2]吕智勇,苏国君,韩渭宾.几种地震定位程序的定位效果分析[J].四川地震,2001,18(2):24-28.
[3]马宝柱,许静.乌鲁木齐遥测地震台网的速报定位[J].内陆地震,1997,11(4):350-360.
[4]中国科学院地球物理研究所.近震分析[M].北京:地震出版社,1977.
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