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Browsing by Author "Moriya, H"

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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
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 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
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

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Browsing by Author "Moriya, H"

Browsing by Author "Moriya, H"

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