TY - GEN
T1 - Spatial variation in stress in seismogenic zones in south african gold mines
AU - The SATREPS & DSeis teams
AU - Ogasawara, H.
AU - Ishida, A.
AU - Sugimura, K.
AU - Yabe, Y.
AU - Abe, S.
AU - Ito, T.
AU - Funato, A.
AU - Kato, H.
AU - Liebenberg, B.
AU - Hofmann, G.
AU - Scheepers, L.
AU - Durrheim, R. J.
N1 - Funding Information:
We sincerely thank Anglogold Ashanti Ltd. and Harmony Gold Ltd., Open House Management Solutions (Pty) Ltd., Seismogen CC, and Groundwork Consulting (Pty) Ltd. for their kind facilitation of the project. Our work was financially supported by the International Continental Scientific Drilling Program
Funding Information:
We sincerely thank Anglogold Ashanti Ltd. and Harmony Gold Ltd., Open House Management Solutions (Pty) Ltd., Seismogen CC, and Groundwork Consulting (Pty) Ltd. for their kind facilitation of the project. Our work was financially supported by the International Continental Scientific Drilling Program (ICDP), Japan Science and Technology Agency-Japan International Cooperation Agency SATREPS program, Japan Science Promotion Society (JSPS) Grant-in-Aid, Core-to-Core Program, JSPS-South African National Research Foundation bilateral program, the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan, under its Earthquake and Volcano Hazards Observation and Research Program, Ritsumeikan University, and Tohoku University.
Publisher Copyright:
© 2019 Taylor & Francis Group, London.
PY - 2019
Y1 - 2019
N2 - We review our endeavor to probe spatial variation in stress in seismogenic zones in deep hard-rock gold mines in South Africa. Highly stressed ground, especially in remnants or pillars, often increases the risks posed by normal-faulting earthquakes to mining operations. Some of these seismogenic zones were identified by AE monitoring, allowing us to explore them with drill holes shorter than several tens of meters in length. A M5.5 strike-slip earthquake, not a usual mining-induced earthquake, took place in 2014 on an unknown nearly-vertical geological structure, with the upper fringe of the aftershock zone several hundreds of meters below the mining horizons. The aftershock zone was elucidated by in-mine dense geophone network and surface strong motion network. This allowed us to drill two holes of 817 and 700 m length from 2.9 km depth. Integration of in-situ stress measurements by both conventional and new methods allows us to constrain the stress field accurately.
AB - We review our endeavor to probe spatial variation in stress in seismogenic zones in deep hard-rock gold mines in South Africa. Highly stressed ground, especially in remnants or pillars, often increases the risks posed by normal-faulting earthquakes to mining operations. Some of these seismogenic zones were identified by AE monitoring, allowing us to explore them with drill holes shorter than several tens of meters in length. A M5.5 strike-slip earthquake, not a usual mining-induced earthquake, took place in 2014 on an unknown nearly-vertical geological structure, with the upper fringe of the aftershock zone several hundreds of meters below the mining horizons. The aftershock zone was elucidated by in-mine dense geophone network and surface strong motion network. This allowed us to drill two holes of 817 and 700 m length from 2.9 km depth. Integration of in-situ stress measurements by both conventional and new methods allows us to constrain the stress field accurately.
UR - http://www.scopus.com/inward/record.url?scp=85091657747&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85091657747&partnerID=8YFLogxK
U2 - 10.1201/9780429327933-5
DO - 10.1201/9780429327933-5
M3 - Conference contribution
AN - SCOPUS:85091657747
SN - 9780367347833
T3 - Rock Dynamics Summit - Proceedings of the 2019 Rock Dynamics Summit, RDS 2019
SP - 39
EP - 44
BT - Rock Dynamics Summit - Proceedings of the 2019 Rock Dynamics Summit, RDS 2019
A2 - Aydan, Omer
A2 - Ito, Takashi
A2 - Seiki, Takafumi
A2 - Kamemura, Katsumi
A2 - Iwata, Naoki
PB - CRC Press/Balkema
T2 - Rock Dynamics Summit, RDS 2019
Y2 - 7 May 2019 through 11 May 2019
ER -