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Browsing by Author "Nakatani, M"

Now showing items 1-14 of 14

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
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
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
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 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
Steady activity of microfractures on geological faults loaded by mining stress

Author: Naoi, M ; Nakatani, M ; Otsuki, K ; Yabe, Y ; Kgarume, Thabang E ; Murakami, O ; Masakale, T ; Ribeiro, L ; Ward, A ; Moriya, H ; Kawakata, H ; Durrheim, R ; Ogasawara, H Date: May 2015 Acoustic Emissions (AE) down to MW ~ –4 were recorded at a site 1 km beneath the surface in the Cooke 4 Mine, South Africa. Several planar AE clusters with lateral extent of 10–100 m were identified. Most of them were located several tens of ... Read more
Unexpectedly frequent occurrence of very small repeating earthquakes (5.1=Mw=3.6) in a South African gold mine: Implications for monitoring intraplate faults

Author: Naoi, M ; Nakatani, M ; Igarashi, T ; Otsuki, K ; Yabe, Y ; Kgarume, Thabang E ; Murakami, O ; Masakale, T ; Ribeiro, L ; Ward, AK ; Moriya, K ; Kawakata, H ; Nakao, S ; Durrheim, RJ ; Ogasawara, H Date: Dec 2015 The authors observed very small repeating earthquakes with -5.1 = Mw = -3.6 on a geological fault at 1 km depth in a gold mine in South Africa. Of the 851 acoustic emissions that occurred on the fault during the 2 month analysis period, 45% ... Read more

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Browsing by Author "Nakatani, M"

Browsing by Author "Nakatani, M"

Browse

All of ResearchSpace

Quick Links

Legislation and compliance

General Enquiries

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