TY  - JOUR
ID  - epos1243
UR  - http://dx.doi.org/10.1007/s00024-013-0721-7
IS  - 10
A1  - Naoi, Makoto
A1  - Nakatani, Masao
A1  - Horiuchi, Shigeki
A1  - Yabe, Yasuo
A1  - Philipp, Joachim
A1  - Kgarume, Thabang
A1  - Morema, Gilbert
A1  - Khambule, Sifiso
A1  - Masakale, Thabang
A1  - Ribeiro, Luís Mário
A1  - Miyakawa, Koji
A1  - Watanabe, Atsushi
A1  - Otsuki, Kenshiro
A1  - Moriya, Hirokazu
A1  - Murakami, Osamu
A1  - Kawakata, Hironori
A1  - Yoshimitsu, Nana
A1  - Ward, Anthony
A1  - Durrheim, Ray
A1  - Ogasawara, Hiroshi
N2  - 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.
VL  - 171
TI  - Frequency?Magnitude Distribution of ?3.7 ? Mw ? 1 Mining-Induced Earthquakes Around a Mining Front and b Value Invariance with Post-Blast Time
AV  - none
EP  - 2684
Y1  - 2014///
PB  - Springer Verlag
JF  - Pure and Applied Geophysics
KW  - Acoustic emission
KW  -  Gutenberg Richter law
KW  - 
Mining-induced earthquake.
SN  - 0033-4553
SP  - 2665
ER  -