用爆破事件测试JOPENS-MSDP中4种定位算法的稳定性

用JOPENS-MSDP地震分析软件提供的Hyposat、Hyp2000、Locsat和单纯型定位算法，分析一次网内和一次网缘爆破试验事件，将测定结果与GPS实测爆破位置进行对比。结果表明：4种方法的测定结果，水平方向误差均达到1类要求，垂直方向误差较大；使用区域走时模型时，Hyposat定位方法测定的网内和网缘事件的水平误差均小于1 km，爆破时间存在0.5 s左右的误差。155万多组随机台站组合的定位结果，进一步证实：①Hyposat最稳定，具体表现为相同台站布局下，Hyposat定位结果水平向置信度最高；在同一置信区间内，相同精度要求下，Hyposat容许的最大空隙角上限最大；②Hyp2000最不稳定，在台站布局好时可信度较高，但随着台站布局变差其结果快速变得最不可靠；③Locsat和单纯型水平向介于二者之间，垂直向明显较差；④在90%的置信区间下，4种方法的定位结果达到1类、2类和3类精度要求的最大空隙角上限不相同。

Testing the stability of the four location algorithMS in JOPENS-MSDP by explosion events

Based on the Hyposat, Hyp2000, Locsat and simple location algorithm provided by the seismic analysis software——JOPENS-MSDP, an intra seismic network explosion event and an explosion event near the boundary of seismic network are analyzed, and the results are compared with the positions measured by GPS. The test results show that the horizontal errors for the location results of the four methods can reached class 1 accuracy, but the vertical errors are much bigger. Using the regional travel time model, the horizontal errors of the internal and marginal network events located by the Hyposat are less than 1 km, and the original time errors of explosions are about 0.5 s. Through the analysis on location results of more than 155 million random station distribution, it can conclude that Hyposat is the most stable. The horizontal results of Hyposat with the same station distribution have the highest level of confidence. With the same confidence interval and precision requirement, Hyposat allows the maximum station gap, and the results of Hyp2000 are the most unstable. When the station distribution is good, the reliability of the Hyp2000 results is relatively high. However, when the station distribution becomes bad, the Hyp2000 results become unreliable. The horizontal errors of Locsat and simple are in middle, and the vertical errors are obviously worse. The tests also reveal that, under the confidence interval of 90%, if the results of the four methods can reach 1, 2, and 3 class of location accuracy, the maximum station gap for location is different.