摘要
使用S变换对2010年淄博矿山地区发生的一组地震事件进行时频分析,并将其能量谱与典型的矿震和天然地震进行对比,结果表明:博山震群中,部分事件的主频率偏低,普遍能量衰减较快等特点符合一般矿震事件的特征,但这组事件的能量密度谱随频率轴的展布较宽,频率成分丰富等特点又与天然构造地震的特点一致。说明这组事件不同于一般由采矿作业引发的矿震活动,可能是由于煤层的采空区强烈改变地下岩层内的应力分布,其他人为活动诱发了与王母山断裂有关的浅层构造活动的结果。
A time-frequency method based on S transform is applied in analysis of shock sequence at Boshan mine area, Shandong Province in 2010. We compare its spectra with those of typical mine events （rock-burst） and natural tectonic events. The result shows that, some events in this sequence have lower dominant frequencies and faster energy attenuation speed. This character is according to the typical mine earthquakes. Meanwhile, the energy density spec- tra of this sequence spread wider along frequency axes, and its frequency components are a- bundant, which implies these events have some features of tectonic earthquakes. This puz- zling phenomenon maybe indicates that the cause of Boshan sequence is somewhat different with common mine earthquakes.
出处
《地震地磁观测与研究》
2014年第5期8-14,共7页
Seismological and Geomagnetic Observation and Research
基金
国家科技支撑计划项目子专题(2012BAK19B04-01-05)
地震科技星火计划项目(XH12028Y)提供资助
关键词
S变换
矿震
时频分析
波谱特征
S transform, mine earthquake, time-frequency analysis, spectrum
