Naoi, Makoto and Nakatani, Masao and Horiuchi, Shigeki and Yabe, Yasuo and Philipp, Joachim and Kgarume, Thabang and Morema, Gilbert and Khambule, Sifiso and Masakale, Thabang and Ribeiro, Luís Mário and Miyakawa, Koji and Watanabe, Atsushi and Otsuki, Kenshiro and Moriya, Hirokazu and Murakami, Osamu and Kawakata, Hironori and Yoshimitsu, Nana and Ward, Anthony and Durrheim, Ray and Ogasawara, Hiroshi (2014) Frequency–Magnitude Distribution of −3.7 ≤ Mw ≤ 1 Mining-Induced Earthquakes Around a Mining Front and b Value Invariance with Post-Blast Time. Pure and Applied Geophysics, 171 (10). pp. 2665-2684. DOI: https://doi.org/10.1007/s00024-013-0721-7
Full text not available from this repository.Abstract
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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Acoustic emission, Gutenberg Richter law, Mining-induced earthquake. |
| Subjects: | Region > RPA Inducing technology > Underground mining Methodology > Method and procesing |
| Project: | IS-EPOS project |