Frequency -magnitude distribution of -3.7 < Mw <1 mining-induced earthquakes around a mining front and b value invariance with post-blast time
Frequency -magnitude distribution of -3.7 < Mw <1 mining-induced earthquakes around a mining front and b value invariance with post-blast time
复制标题
采矿前缘周围-3.7 < Mw <1 采矿诱发地震的频率震级分布以及 b 值随爆炸后时间的不变性
DOI：
10.1007/s00024-013-0721-7
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发表时间：
2013
影响因子：
2
通讯作者：
and H. Ogasawara
中科院分区：
文献类型：
--
作者：
Naoi;M.;M. Nakatani;S. Horiuchi;Y. Yabe;J. Philipp;T. Kgarume;G. Morema;S. Khambule;T. Masakale;L. Ribeiro;K. Miyakawa;A. Watanabe;K. Otsuki;H. Moriya;O. Murakami;H. Kawakata;N. Yoshimitsu;A. Ward;R. Durrheim;and H. Ogasawara
我们调查了频率幅度分布（FMD）的声发射（AE）发生在附近的一个活跃的开采前在南非金矿，使用一个目录开发的AE网络，这是能够检测AE下降到MW −5。当删除爆破记录时，AE的FMD符合古滕贝格-里希特定律，具有相似的b值，不依赖于从最初的1分钟间隔到超过30小时的爆破后时间。这一结果否定了先前研究（RichardsonandJordanBull Seismol Soc Am，92：1766-1782，2002）中的建议，即爆破产生的新裂缝干扰了背景事件的尺寸分布，他们将其解释为现有弱面上的滑动事件。我们的AE目录显示，对于采矿前沿周围的AE，在MW −3.7和0之间，b ≥ 1.2的GR定律有效。此外，使用矿山的地震目录，它涵盖了同一地区的较长的时间段，我们可以扩大GR法的有效范围与相同的b值高达MW 1。
We investigated frequency-magnitude distribution (FMD) of acoustic emissions (AE) occurring near an active mining front in a South African gold mine, using a catalog developed from an AE network, which is capable of detecting AEs down toMW−5. When records of blasts were removed, FMDs of AEs obeyed a Gutenberg−Richter law with similarbvalues, not depending on post-blasting time from the initial 1-min interval through more than 30 h. This result denies a suggestion in a previous study (RichardsonandJordanBull Seismol Soc Am, 92:1766–1782, 2002) that new fractures generated by blasting disturb the size distribution of background events, which they interpreted as slip events on existing weak planes. Our AE catalog showed that the GR law withb∼ 1.2 was valid betweenMW−3.7 and 0 for AEs around the mining front. Further, using the mine’s seismic catalog, which covers a longer time period of the same area, we could extend the validity range of the GR law with the samebvalue up toMW1.