ResearchSpace
→
Browsing by Author

Browsing by Author "Ogasawara, H"

Now showing items 1-20 of 22

Next Page

Can mine tremors be predicted? Observational studies of earthquake nucleation, triggering and rupture in South African mines

Author: Durrheim, RJ ; Ogasawara, H Date: May 2012 Mining-induced earthquakes pose a risk to workers in deep mines, while natural earthquakes pose a risk to people living close to plate boundaries and even in stable continental regions. A five-year ca. US$3 million Japan-SA collaborative ... Read more
Coseismic and aseismic deformations associated with mining-induced seismic events located in deep level mines in South Africa

Author: Milev, A ; Share, P ; Durrheim, RJ ; Naoi, M ; Nakatani, M ; Yabe, Y ; Ogasawara, H Date: Oct 2013 Two underground sites in a deep level gold mine in South Africa were instrumented by the Council for Scientific and Industrial Research (CSIR) with tilt meters and seismic monitors. One of the sites was also instrumented by Japanese-German ... Read more
Delineation of large localized damage structures forming ahead of an active mining front by using advanced acoustic emission mapping techniques

Author: Moriya, H ; Naoi, M ; Nakatani, M ; van Aswegen, C ; Murakami, O ; Kgarume, Thabang E ; Ward, AK ; Durrheim, RJ ; Philipp, J ; Kawakata, H ; Ogasawara, H Date: Oct 2015 The authors applied advanced mapping techniques to 291 230 acoustic emission (AE) events as small as around M -4 that were recorded over 50 days by an ultra-high resolution network close to the active front of a tabular mining stope being ... Read more
Detection of mining-induced fractures around a stope in Ezulwini gold mine, South Africa, by using AE events with similar waveforms

Author: Moriya, H ; Naoi, M ; Nakatani, M ; Murakami, O ; Kgarume, Thabang E ; Ward, AK ; Durrheim, R ; Philipp, J ; Yabe, Y ; Kawakata, H ; Ogasawara, H Date: Nov 2012 The ability to predict rock failure is desirable for the prevention of disasters in mines. The acoustic emission (AE) method is a well-known tool for monitoring fracture growth in rock masses that is used to help ensure safety during excavations. ... Read more
Effect of face fracturing on shear wave coda quality factor estimated from acoustic emission events

Author: Kgarume, Thabang E ; Milev, A ; Nakatani, M ; Naoi, M ; Yabe, Y ; Philipp, J ; Durrheim, RJ ; Ogasawara, H ; Ward, T Date: Oct 2013 The dependency of the quality factor derived from S wave coda (Q(subc)) on frequency is analysed in order to understand the effect of fracturing ahead of a mining stope. Micro seismic events recorded using acoustic emission sensors in a mining ... Read more
Establishment of SATREPS experimental sites in South African gold mines to monitor phenomena associated with earthquake nucleation and rupture

Author: Durrheim, RJ ; Ogasawara, H ; Nakatani, M ; Yabe, Y ; Kawakata, H ; Naoi, M ; Ward, AK ; Murphy, SK ; Wienand, J ; Lenegan, P ; Milev, AM ; Murakami, O ; Yoshimitsu, N ; Kgarume, Thabang E ; Cichowicz, A Date: Mar 2012 Mining-induced earthquakes pose a risk to workers in deep mines, while natural earthquakes pose a risk to everywhere, but especially near plate boundaries. A five year Japanese–South African collaborative project entitled ‘Observational studies ... Read more
Experimental and in-situ physical properties measurements from a seismogenic zone in a deep South African mine

Author: Nkosi, N ; Manzi, M ; Roberts, David P ; Durrheim, R ; Ogasawara, H ; Ziegler, M ; Liebenberg, B ; Onstott, T Date: Sep 2022 Since the 1990s, South Africa has experienced several sizeable earthquakes occurring in mining regions at depths ranging between 2 km and 4 km below the surface. These consist of the Welkom (ML 4.2) and Stilfontein (ML 5.3) earthquakes, which ... Read more
Frequency–magnitude distribution of -3.7 < M(subW) < 1 mining-induced earthquakes around a mining front and b value invariance with post-blast time

Author: Naoi, M ; Nakatani, M ; Horiuchi, S ; Yabe ; Philipp, J ; Kgarume, Thabang E ; Morema, G ; Khambule, S ; Masakele, T ; Ribeiro, L ; Miyakawa, K ; Watanabe, A ; Otsuki, K ; Moriya, H ; Murakami, O ; Kawakata, H ; Yoshimitsu, N ; Ward, A ; Durrheim, R ; Ogasawara, H Date: Oct 2014 The authors 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 ... Read more
In-situ monitoring and modelling of the rock mass response to mining: Japanese-South African collaborative research

Author: Ogasawara, H ; Hofmann, G ; Kato, H ; Nakatani, M ; Moriya, H ; Naoi, M ; Yabe, Y ; Durrheim, R ; Cichowicz, A ; Kgarume, Thabang E ; Milev, A ; Murakam, O ; Satoh, T ; Kawakata, H Date: Sep 2013 The Japanese-South African intergovernmental science and technology project “Observational studies to mitigate seismic risks in mines” includes seismological studies aimed at a better understanding of how a seismic event is prepared and strong ... Read more
Integration of underground mapping, petrology, and high-resolution microseismicity analysis to characterise weak geotechnical zones in deep South African gold mines

Author: Mngadi, SB ; Durrheim, RJ ; Manzi, MSD ; Ogasawara, H ; Yabe, Y ; Yilmaz, H ; Wechsler, N ; Van Aswegen, G ; Roberts, David P Date: Feb 2019 A highly-stressed shaft pillar is prone to large seismic events, falls of ground and rockbursts, which may cause injuries and loss of production, especially in weak geotechnical zones. It is thus important to identify weak geotechnical zones ... Read more
Japanese-South African collaboration to mitigate seismic risks in deep gold mines

Author: Ogasawara, H ; Durrheim, RJ ; Nakatani, M ; Yabe, Y ; Milev, A ; Cichowicz, A ; Kawakata, H ; Moriya, H ; JST-JICA SA research group Date: Sep 2009 Mining-induced seismicity poses a hazard to workers in deep South African mines, while natural earthquakes pose a hazard to people living in Japan and other regions of the world that are close to plate boundaries. Researchers introduce a ... Read more
Mapping seismic vulnerability in stopes in deep South African gold mines

Author: Durrheim, RJ ; Kuijpers, J ; Henry, G ; Brink, AVZ ; Kagezi, B ; Ferreira, G ; Teleka, Ruth ; Milev, A ; Ogasawara, H ; Ward, A ; Wienand, J Date: Sep 2013 The project “Observational studies in South African mines to mitigate seismic risks” has established research sites in three deep gold mines, Cooke 4 Shaft, KDC West and Moab Khotsong. Observations are focused on three regions: (i) the target ... Read more
Observational studies in South African mines to mitigate seismic risks: a mid-project progress report

Author: Durrheim, RJ ; Ogasawara, H ; Nakatani, M ; Yabe, Y ; Milev, AM ; Cichowicz, A ; Kawakata, H ; Moriya, H ; Naoi, M ; Kgarume, Thabang E ; Murakami, O Date: Oct 2013 Mining-induced earthquakes pose a risk to workers in deep mines, while natural earthquakes pose a risk to people living close to plate boundaries and even in stable continental regions. A 5-year Japan-SA collaborative project "Observational ... Read more
Observational studies in South African mines to mitigate seismic risks: a mid-project progress report

Author: Durrheim, RJ ; Ogasawara, H ; Nakatani, M ; Yabe, Y ; Milev, AM ; Cichowicz, A ; Kawakata, H ; Moriya, H ; Naoi, M ; Kgarume, Thabang E ; Murakami, O Date: Oct 2013 Mining-induced earthquakes pose a risk to workers in deep mines, while natural earthquakes pose a risk to people living close to plate boundaries and even in stable continental regions. A 5-year Japan-SA collaborative project "Observational ... Read more
Observational studies of the rock mass response to mining in highly-stressed gold mines in South Africa

Author: Ogasawara, H ; Nakatani, T ; Durrheim, RJ ; Naoi, M ; Yabe, Y ; Moriya, H ; Hofmann, GF ; Stander, C ; Roberts, David P ; De Bruin, P ; Oelofse, J ; Kato, H ; Cichowicz, A ; Birch, D ; Ngobeni, D ; Milev, A ; Kgarume, Thabang E ; Satoh, T ; Horiuchi, S ; Kawakata, H ; Murakami, O ; Yoshimitsu, N ; Ward, AK ; Wienand, J ; Lenegan, P ; Yilmaz, H ; Mngadi, S ; Piper, PS ; Clements, TN ; Nakao, S ; Okubo, M ; Ishii, H ; Visser, AV Date: Sep 2014 A multi-disciplinary study of the response of the rock mass to mining and mining-induced earthquakes has been conducted in six gold mines in South Africa at sites deeper than 3 km, or with equivalent stress. More than 80 holes (with a total ... Read more
Observational studies to mitigate seismic risks in mines: a new Japanese-South African collaborative research project

Author: Durrheim, RJ ; Ogasawara, H ; Nakatani, M ; Yabe, Y ; Milev, AM ; Cichowicz, A ; Kawakata, H ; Moriya, H Date: Oct 2010 Mining-induced earthquakes pose a risk to workers in deep South African mines, while natural earthquakes pose a risk to people living close to plate boundaries. The authors introduce a 5-year Japanese - South African collaborative project ... Read more
Observational study to mitigate seismic risks in mines: a new Japanese-South African collaborative project

Author: Durrheim, RJ ; Ogasawara, H ; Nakatani, M ; Yabe, Y ; Milev, A ; Cichowicz, A ; Kawakata, H ; Moriya, H ; JST-JICA SA Research Group Date: Sep 2009 Mining-induced earthquakes pose a hazard to workers in deep South African mines, while natural earthquakes pose a hazard to people living close to plate boundaries. Researchers introduce a 5-year Japanese-South African collaborative project ... Read more
Physical property studies to elucidate the source of seismic reflectivity within the ICDP DSeis seismogenic zone: Klerksdorp goldfield, South Africa

Author: Nkosi, Nomqhele Z ; Manzi, MSD ; Westgate, M ; Roberts, Dave ; Durrheim, RJ ; Ogasawara, H ; Ziegler, M ; Rickenbacher, M ; Liebenberg, B ; Onstott, TC Date: Jul 2022 Petrophysical properties of cylindrical core specimens from three boreholes from the International Continental Scientific Drilling Program, the DSeis project, measured at ambient pressure and room temperature conditions in various laboratories ... Read more
Relating high-resolution tilt measurements to the source displacement of an M2.2 event located at Mponeng gold mine

Author: Share, P ; Milev, A ; Durrheim, R ; Kuijpers, J ; Ogasawara, H Date: Oct 2013 As part of JAGUARS (JApanese-German Underground Acoustic emission Research in South Africa), high-resolution tiltmeters were installed during 2007 at Mponeng gold mine, South Africa, in an attempt to study and understand the risks posed by ... Read more
Relating tilt measurements recorded at Mponeng Gold Mine, South Africa to the rupture of an M 2.2 event

Author: Share, P ; Milev, A ; Durrheim, R ; Kuijpers, J ; Ogasawara, H Date: Sep 2013 High resolution tiltmeters were installed during 2007 at Mponeng gold mine, South Africa, in an attempt to study and understand the risks posed by in-mine seismic events and to subsequently use the knowledge gained to mitigate the said risks. ... Read more

Now showing items 1-20 of 22

Next Page

Browse

All of ResearchSpace

Quick Links

Legislation and compliance

General Enquiries

Tel: + 27 12 841 2911
Email: callcentre@csir.co.za

Physical Address
Meiring Naudé Road
Brummeria
Pretoria
South Africa

Postal Address
PO Box 395
Pretoria 0001
South Africa

Social Connect

Copyright © CSIR 2017. All Rights Reserved

Resources on this site are free to download and reuse according to associated licensing provision. Please read the terms and conditions of usage of each resource.