Frequency–Magnitude Distribution of −3.7 ≤ M W ≤ 1 Mining-Induced Earthquakes Around a Mining Front and b Value Invariance with Post-Blast Time

Makoto Naoi, Masao Nakatani, Shigeki Horiuchi, Yasuo Yabe, Joachim Philipp, Thabang Kgarume, Gilbert Morema, Sifiso Khambule, Thabang Masakale, Luiz Ribeiro, Koji Miyakawa, Atsushi Watanabe, Kenshiro Otsuki, Hirokazu Moriya, Osamu Murakami, Hironori Kawakata, Nana Yoshimitsu, Anthony Ward, Ray Durrheim, Hiroshi Ogasawara

研究成果: Article査読

27 被引用数 (Scopus)

抄録

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 to MW −5. When records of blasts were removed, FMDs of AEs obeyed a Gutenberg−Richter law with similar b values, 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 (Richardson and Jordan Bull 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 with b ∼ 1.2 was valid between MW −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 same b value up to MW 1.

本文言語English
ページ(範囲)2665-2684
ページ数20
ジャーナルPure and Applied Geophysics
171
10
DOI
出版ステータスPublished - 2014 10

ASJC Scopus subject areas

  • 地球物理学
  • 地球化学および岩石学

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