Identification and Analysis of Micro-earthquake Events in Open-pit Ore Area Based on Waveform Characters——A Case Study of Zhuozishan Molybdenum Mine
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摘要: 基于前人研究成果以及现场的实测结果，采用卓资山露天钼矿微震监测项目产出资料，提取了5类微震事件的波形特征和时频特征。波形特征显示：微地震的振幅、辐射均匀性和频率变化特征表明微地震是由于岩层受到单力偶和剪切力作用破裂而产生；爆破具有P波初动方向向上、S波不易识别的特点，包含“初震段、主震段、尾波段”三段变化形态；小型边坡滑坡波事件属楔体滑坡，是由多个“加速—缓冲—终止”构成，波形是由包络线呈“V”字形的多组脉冲波列组成；机械开采震动事件具有自振能量不变、脉冲幅度相差很大、持续时间间隔不确定的特点；运输车辆波形振幅具有形态“弱—强—弱”、等频率、包络线呈多段纺锤形的特征。时频空间分布可以分为相对独立、界限分明的两类：一类包含微地震、爆破、机械开采、小型边坡滑坡事件，另一类只包含车辆运输事件。Abstract: Based on the previous research results and the field measurements, taking Zhuozishan open-pit molybdenum mine as an example, we analyzed the waveform and time-frequency characteristics of five kinds of micro-seismic events in the region. The amplitude, radiation uniformity and frequency variation of the microearthquakes show that the microearthquakes are caused by the single force couple and shear force. The blasting has a upward P wave initial direction, whereas the initial direction of S wave is not easy to identify, characterized with three section changes of initial earthquake, main shock and tail band". The event of small slope landslide belongs to wedge-body landslide, and the total process is composed of several so-called acceleration-buffer terminations, in which the waveform is composed of multiple sets of pulse wave trains with "V" shape of envelope line. The vibration event of mechanical mining is characterized by constant natural vibration energy, great difference in pulse amplitude and uncertain duration interval. The wave amplitude of the transport vehicle has the shape of "weak-strong-weak", equal frequency and multi-segment spindle shape. The time-frequency spatial distribution can be divided into two categories. The first contains micro-earthquakes, blasting, mechanical mining and small slope landslides, and the second contains only vehicle transport events. The research results provide a reference for the identification of microseismic events in open pit mines.
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图 4 微地震波形（ML 0.9，震中距Δ=1050.5m）
Figure 4. The microseismic waveform (ML 0.9, epicentral distanceΔ=1050.5m)
图 5 微地震时频特征（ML 0.9，震中距Δ=1050.5m）
Figure 5. Time-frequency characteristics of microseismic(ML 0.9, epicentral distanceΔ=1050.5m)
图 11 ML 1.9小型边坡楔体滑坡波形
Figure 11. Waveform of ML 1.9 from the small slope wedge landslide
图 12 小型边坡滑坡事件时频特征曲线
Figure 12. Time-frequency characteristic curve of small slope and landslide events
图 13 ML 1.8的机械开采震动事件波形
Figure 13. Event waveform of ML 1.8 from the mechanical mining vibration
图 14 机械开采震动事件时频分析曲线
Figure 14. Time-frequency analysis curve of vibration events by mechanical mining
图 16 运输车辆事件时频分析特征曲线
Figure 16. The time-frequency characteristic curve of transport vehicle events
图 17 5类事件时频空间分布对比
Figure 17. Comparison of time-frequency spatial distribution of five typical events
表 1 5种类型事件波形特征统计表
Table 1. Statistical results of waveform characteristics of five typical events
事件类型 个数 震级范围
ML事件波形形态 频率集中度 持续时间
均值/s衰减
方式微地震 56 -0.5—1.9 包含P波、S波，面波发育，是能量较小的地震波 72×10-15 11.33 指数衰减，较快 爆破 79 -0.65—0.9 P波尖锐（初动向上）、S波不易识别，包含“初震”、“主震”、“尾波”三段 75×10-15 12.81 幂函数衰，减快 小型滑坡 23 1.5—1.9 由包络线呈“V”字型的波列组成 75×10-15 11.53 起伏不定，较慢 机械开采 206 -0.9—1.8 由“密集”、“尖锐”的波列组成 70×10-15 11.06 不规律 运输车辆 367 -0.6—1.0 由近似连续的、多组波形尖锐、包络线呈“纺缍”形的密集波列组成 30×10-15 10.70 不规律 
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表 2 5种事件类型时频分布特征
Table 2. Time-frequency distribution characteristics of five typical events
事件类型 时间均值范围/ms 频率均值范围/Hz 微地震 4150—5583 10—14 爆破 4800—6600 6—13.3 小型边坡滑坡 5500—8500 4.8—8 机械开采 2250—7400 4.2—10.8 车辆运输 4333—6000 18—24.2
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