基于VFOM的矿山微震震源定位及近震震级标定

发布时间：2018-09-10 06:28

【摘要】：矿山微震事件震源位置和近震震级是矿震最基本的参数,其准确计算对矿震事件分析与信息挖掘具有重要作用。介绍了一种有别于传统定位思路的定位方法—虚拟场优化法(virtual field optimization method,VFOM),并给出了以台站计算震级偏差最小为目标的近震震级公式回归方法。将VFOM和近震震级参数回归方法用于开阳磷矿用沙坝矿区401个微震事件的震源定位和近震震级公式的重新标定。结果表明,定位结果可靠,重新标定震级公式得到的震级台站偏差相比于现有公式有明显的减小。此外,采用标定震级公式计算的震级分布观察到了明显的双峰分布现象,表明用沙坝矿的微震数据可能由两种成因的事件构成。实例表明,不同地区的近震震级计算公式必须根据实测数据重新标定,否则将可能丢失一些重要的震级分布特征。
[Abstract]:The source location and near magnitude of mine microseismic events are the most basic parameters of mine earthquakes, and their accurate calculation plays an important role in mine earthquake event analysis and information mining. This paper introduces a positioning method, virtual field optimization method (virtual field optimization method,VFOM), which is different from the traditional positioning method, and gives a regression method of near-earthquake magnitude formula aiming at minimum magnitude deviation of seismic station. VFOM and the regression method of near earthquake magnitude parameters are applied to the focal location of 401 microseismic events in Shaba mining area of Kaiyang Phosphate Mine and the recalibration of the near earthquake magnitude formula. The results show that the positioning results are reliable and the deviation of the magnitude station obtained from the recalibrated magnitude formula is obviously smaller than that of the existing formula. In addition, the magnitude distribution calculated by the formula of calibrating magnitude shows that the phenomenon of bimodal distribution is obvious, which indicates that the microseismic data of Shaba mine may be composed of two kinds of genetic events. Examples show that the calculation formula of near-earthquake magnitude in different regions must be recalibrated according to the measured data, otherwise, some important magnitude distribution characteristics may be lost.
【作者单位】：中南大学资源与安全工程学院;中南大学深部金属矿产开发与灾害控制湖南省重点实验室;
【基金】：国家自然科学基金项目(41272304,11472311,51504288) 湖南省研究生科研创新项目(CX2015B052)
【分类号】：P315

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