Researcher Database

OGASAWARA Hiroshi

Department / Course Research Organization of Science and Technology

Title / Position Professor

Academic conference presentation
1.	2023/07/21	DSeis: Drilling into Seismogenic zones in South African gold mines (ICDP 25+ Conference on Scientific Drilling)
2.	2023/07/11	Radiolysis-Driven Evolution of an Ancient Subsurface Habitable Brine in the Witwatersrand Basin, South Africa (Goldschmidt 2023)
3.	2023/05/23	ICDP DSeis:2014年オークニー地震の余震発生帯をホストしているlamprophyyreダイクの鉱物組み合わせと変質の空間変化 (日本地球惑星科学連合2023年大会)
4.	2023/04/27	ICDP Drilling into Seismogenic zones in South African mines (DSeis; 2016 – onwards) (EGU General Assembly 2023)
5.	2021/06/06	ICDP DSeis project: compilation of borehole logging and recovered core information at the seismogenic zone of the M5.5 Orkney earthquake with lower crustal intrusives (JpGU)
6.	2020/12/11	Reinterpretation of a legacy 3D seismicreflection data to elucidate an unusual sinistral M5.5 earthquake fault below a structurallycomplex deep gold mine (American Geophysical Union 2020 Fall Meeting)
7.	2020/11/14	[Invited] The 2014 Orkney M5.5 sinistral earthquake below a deep South African gold mine and the post-earthquake drilling investigation from 2.9km depth (2020 International Forum on Pohang Earthquake)
8.	2020/07/12	[Invited] The next step following the accomplished drilling into seismogenic zones of M2.0-5.5 earthquakes in South African gold mines (ICDP DSeis) (Japan Geoscience Union 2020)
9.	2020/05/06	Stress state in the upper margin of the aftershock zone of the 2014 Orkney earthquake (M5.5), South Africa, estimated from analyses of drill cores and borehole breakouts of ICDP-DSeis drillings (European Geophyiscal Union 2020)
10.	2019/12/09	Abiotic (Prebiotic?) Organic Chemistry in a Potentially Ancient Hypersaline Brine: New Insights on the Limits of Microbial Life Inhabiting 3.1 km Deep Fracture Fluid in South Africa (American Geophysical Union Fall Meeting)
11.	2019/12/09	Stress state in the upper margin of aftershock zone of the 2014 Orkney earthquake (M5.5), South Africa, measured from boring cores of ICDP-DSeis project (American Geophysical Union Annual Meeting)
12.	2019/12/09	The effect of gouge formation on fault propagation along underground brittle shear fractures (American Geophysical Union Annual Meeting)
13.	2019/11/07	riny SLiMEs in the subsurface of Earth and Mars
14.	2019/09/18	M5.5 Orkney地震を引き起こした断層岩および母岩の鉱物組成と微小構造（ICDP DSeis Project） (日本地震学会秋季大会)
15.	2019/05/29	DSeis 10: Near-field Observations for the M5.5 Orkney, South Africa Earthquake (Japan Geophysical Union Annual Meeting)
16.	2019/05/29	DSeis 6: Deformation Rate Analysis of the M5.5 aftershock zone core - stress concentration at reflective intrusives (Japan Geophysical Union Annual Meeting)
17.	2019/05/29	ICDP DSeis 1: Introduction into JpGU 2019 papers on Drilling into Seismogenic zones of M2.0-5.5 earthquakes in South African gold mines (Japan Geophysical Union Annual Meeting)
18.	2019/05/29	ICDP DSeis 2: Preliminary results of physical property measurement and XRD analysis of the M5.5 fault material recovered from DSeis Project (Japan Geophysical Union Annual Meeting)
19.	2019/05/29	ICDP DSeis 3: Spatial variation in stress state in the source region of Orkeny earthqauke (M5.5) based on analyses of the ICDP-DSeis borehole cores (Japan Geophysical Union Annual Meeting)
20.	2019/05/29	ICDP DSeis 4: Drilling, core logging, and in-hole geophysical logging of ICDP DSeis drilling into the M5.5 aftershock zones in a South African gold mines (Japan Geophysical Union Annual Meeting)
21.	2019/05/29	ICDP DSeis 5: Diametrical Core Deformation Analysis of the M5.5 aftershock zone core - stress concentration at reflective intrusives and transition in stress regimes (Japan Geophysical Union Annual Meeting)
22.	2019/05/29	ICDP DSeis 7: compilation of stress information and comparison with calculated stresses in the M5.5 aftershock zones (Japan Geophysical Union Annual Meeting)
23.	2019/05/29	ICDP DSeis 8: the M5.5 fault structure and reflective intrusives in legacy 3DSeismic reflection data, (Japan Geophysical Union Annual Meeting)
24.	2019/05/29	ICDP DSeis 9: are streaks in the M5.5 aftershocks potentially located on highly stressed intrusive? (Japan Geophysical Union Annual Meeting)
25.	2019/05/23	SA Japan collaboration in earthquake science since 1994 (South Africa - Japan University Forum)
26.	2019/05/09	Potential borehole observatory in the aftershock zone at about 3.5 km depth of a 2014 M5.5 sinistral earthquake that the ICDP DSeis project has probed (Japan Geophysical Union Annual Meeting)
27.	2019/04/07	Near-Field Observations of the Rupture for the M5.5 Orkney, South Africa Earthquake (American Seismological Society Annual Meeting)
28.	2019/04	An overview of the completed ICDP project, Drilling into Seismogenic zones of M2.0-5.5 earthquakes in South African gold mines (DSeis) (European Geophysical Union 2019 General Assembly)
29.	2019/04	In-situ stress around earthquake source faults in and beneath South African deep gold mines (European Geophysical Union 2019 General Assembly)
30.	2019/04	Investigations on fault zone gases in South African gold mines (European Geophysical Union 2019 General Assembly)
31.	2019/04	Rupture Imaging and Directivity of the 2014 M5.5 Earthquake Below a Gold Mine in Orkney, South Africa (European Geophysical Union 2019 General Assembly)
32.	2018/12	Close Observations of the Rupture for the M5.5 Orkney, South Africa Earthquake (American Geophysical Union 2018 Fall Meeting)
33.	2018/12	Exploring the Limits of Life in a South African Deep Subsurface Brine (American Geophysical Union 2018 Fall Meeting)
34.	2018/12	Rupture Imaging and Directivity of the 2014 M5.5 Earthquake Below a Gold Mine in Orkney, South Africa (American Geophysical Union 2018 Fall Meeting)
35.	2018/10/10	An overview of DSeis endeavours in Cooke 4 mine and laboratory test on DSeis cores (Japan Seismological Society 2018 Fall Meeting)
36.	2018/10/10	Interpretation of the merged 3D seismic volume covering the seismogenic zone of M5.5 Orkney　earthquake (Japan Seismological Society 2018 Fall Meeting)
37.	2018/10/10	Reflection seismic imaging of the causative geological structure of the M5.5 earthquake (2014) in South Africa (Japan Seismological Society 2018 Fall Meeting)
38.	2018/06/26	Drilling into seismogenic zones of M2.0–M5.5 earthquakes in deep South African gold mines - completed last Friday (AfricaArray annual workshop 2018)
39.	2018/06	Rupture process of the M5.5 Orkney earthquake using strainmeters at very close distance (Asia Oceania Geosciences Society 15th Annual Meeting)
40.	2018/06	Stress states in the source regions of M2-5.5 earthquakes estimated by the ICDP DSeis drilling in South African deep gold mines (Asia Oceania Geosciences Society 15th Annual Meeting)
41.	2018/04	Core and borehole logging and stress measurements of a 817 m long borehole drilled from 2.9 km depth toward the Moab Khotsong 2014 M5.5 aftershock zone (ICDP DSeis project in South Africa) (European Geophysical Union 2018 General Assembly)
42.	2018/04	Re-processing seismic reflection data to calibrate the velocity field surrounding the Orkney M5.5 seismogenic zone to identify a capable fault (European Geophysical Union 2018 General Assembly)
43.	2018/04	Recovery of ruptures from seismogenic zone at Cooke 4 mine (DSeis - ICDP scientific drilling project in the South-African gold mines) (European Geophysical Union 2018 General Assembly)
44.	2018/04	The status of on-going drilling into seismogenic zones of M2.0 – M5.5 earthquakes from deep South African gold mines (DSeis) (European Geophysical Union 2018 General Assembly)
45.	2017/12/11	A new method of stress measurement based upon elastic deformation of core sample with stress relief by drilling (American Geophysical Union 2017 Fall Meeting)
46.	2017/12/11	The DSeis project: drilling into seismogenic zones of M2.0-5.5 earthquakes in South African gold mines. (American Geophys. Union, Fall Meeting (AGU）)
47.	2017/10/13	Drilling into seismogenic zones of M2.0-M5.5 earthquakes from deep South African gold mines (DSeis): establishment of research sites. (Proc. Afrirock Symposium 2017 (Int. Soc. Rock Mech.; ISRM))
48.	2017/09/30	Observational studies in South African mines to mitigate seismic risks (Proc. Afrirock Symposium 2017 (ISRM))
49.	2017/03/16	Drilling to probe quasi-static and dynamic seismic ruptures in deep South African gold mines. (Schatzalp 2nd Induced Seismicity Workshop)
50.	2016/12/15	Estimate of the stress state of earthquake source region in a South African deep gold mining by Diametrical Core Deformation Analysis (DCDA) (American Geophysical Union Fall Meeting 2016)
51.	2016/09/02	Drilling into seismologic zones of M2.0 – M5.5 earthquakes in deep South African gold mines (DSeis) (35th Intentional Geological Congress)
52.	2016/09/02	Mitigation of the rockburst risk in deep South African gold mines (35th International Geological Congress)
53.	2016/08/29	Searching for the significant displacement zone of the 2014 Orkney earthquake fault with strain data and Map3Di for targeting scientific drilling (35th Intenational Geological Congress)
54.	2016/08/29	The 2014 Orkney M5.5: location of initial and main rupture origins and high energy emission sources (35th International Geological Congress)
55.	2016/05/26	Scientific drilling into seismogenic zones of M2.0 –M5.5 earthquakes in deep South African gold mines (DSeis) (Japan Geoscience Union Meeting 2016)
56.	2016/05/26	Aftershock distribution and focal mechanisms of 2014 Mw5.4 Orkney earthquake, South Africa, by using underground seismic networks in gold mines (Japan Geoscience Union Meeting 2016)
57.	2016/05/25	Estimate of the stress state in earthquake source region in South African deep gold mine by DCDA (Japan Geoscience Union Meeting 2016)
58.	2016/05/25	Searching largest displacement zone of the 2014 Orkney Earthquake fault with strain data and using Map3Di for scientific drilling (Japan Geoscience Union Meeting 2016)
59.	2016/05/25	Emergence and disappearance of repeating earthquakes on a geological fault in a deep gold mine in South Africa (Japan Geoscience Union Meeting 2016)
60.	2016/04/18	Drilling into seismogenic zones of M2.0 – M5.5 earthquakes in deep South African gold mines (DSeis) (EGU 2016 meeting)
61.	2015/12	Acoustic emission monitoring in Cooke 4 gold mine in South Africa –summary of the main findings of a 5-year SATREPS project– (AGU 2015 Fall Meeting)
62.	2015/12	Drilling into seismogenic zones of M2.0 – M5.5 earthquakes in deep South African gold mines (DSeis) (AGU 2015 Fall Meeting)
63.	2015/05/26	Mitigation of the rockburst risk in deep South African gold mines (JpGU)
64.	2015/05/26	Routine estimation of source parameters of mining-related earthquakes (JpGU 2015)
65.	2015/03/19	Keynote address: Observational studies in South African mines to mitigate seismic risks (Stress & Seismicity Workshop)
66.	2015/03/12	Monitoring of Microseismicity in Deep Gold Mines in South Africa (AGIS Induced Seismicity Workshop)
67.	2015/03/11	Stress and strength at seismic event hypocenters in deep South African gold mines and the M5.5 Orkney Earthquake (AGIS Induced Seismicity Workshop)
68.	2015/03/09	Keynote address: Observational studies in South African mines to mitigate seismic risks (Bergmekanikdagen (Rock Mechanics Day))
69.	2015/01/20	Stress and strength at seismic event hypocenters in deep South African gold mines and the M5.5 Orkney Earthquake (10th annual AfricaArray Workshop)
70.	2014/12/17	The stress and strength at hypocenters at Tau Tona and Mponeng gold mines，South Africa (AGU 2014 Fall Meeting)
71.	2014/12/16	Nucleation process of an M2 earthquake in a deep gold mine in South Africa inferred from on-fault foreshock activity (AGU 2014 Fall Meeting)
72.	2014/12/15	Active monitoring of a fault with seismogenic potential using an ultrasonic transmission at 1 km deep in the Ezulwini Mine，South Africa (AGU Fall meeting)
73.	2014/09/16	Observational studies of the rock mass response to mining in highly stressed gold mines in South Africa (Proc. 7th Int. Congress on Deep and High Stress Mining)
74.	2014/08/18	JST-JICA SATREPS potential contribution to the studies on the M5.5 near Orkney (CSIR Seminar on M5.5 earthquake near Orkney)
75.	2014/07/26	In-situ monitoring of strain change in seismogenic volumes to calibrate fault loading at deep-levels South African gold mines to mitigate seismic hazard (Int. Symp. Geodesy Earthq. Natural Hazards)
76.	2014/07/26	In-situ stress measurements and calibration of stress modeling to mitigate seismic hazard at deep-levels South African gold mines (Int. Symp. Geodesy Earthq. Natural Hazards)
77.	2014/07/23	Strain in a South African Gold Mine by the 2011 Tohoku Earthquake (Int. Symp. Geodesy Earthq. Natural Hazards)
78.	2014/07/23	Stress State around a Source Fault of Mw2.2 Earthquake in a Deep Gold Mine in South Africa (Int. Symp. Geodesy Earthq. Natural Hazards)
79.	2014/05/05	Acoustic emissions down to magnitude Mw=-5 delineating damages around mining stopes and pre-existing faults: spatial distribution，temporal change and source parameters (Institute of Mine Seismology，the 24th Seminar)
80.	2014/05/05	Development of automatic hypocenter location with accuracy compared to manual picking，Institute of Mine Seismology (the 24th Institute of Mine Seismology Seminar)
81.	2014/05/05	Monitoring seismogenic regions of mines through acoustic properties of active transmitted waves and seismic stress parameters (Institute of Mine Seismology，the 24th Seminar)
82.	2014/05/05	Observational Studies to Mitigate Seismic Risks in South African Mines (Institute of Mine Seismology，the 24th Seminar)
83.	2014/02/13	BX CCBO in-situ stress measurements at earthquake prone areas in South African gold mines – a summary of mini-workshop on 13 Feb 2014 (Proc. ARMA 48th U.S. Rock Mech. / Geomech. Symp.)
84.	2013/09/22	Current status and outlook of the research on stress at proximity of hypocenters in South African gold mines.
85.	2013/08/19	A provisional plan of multiple stress measurements at a seismic source at great depth at South African gold mines (“Workshop on Earthquake and Stress” in association with 6th Int. Symp. In-situ Rock Stress)
86.	2011/11/21	KEYNOTE The Great Eastern Japanese Earthquake and tsunami of 11 March 2011 and the research we are doing in South African gold mines (AfricaArray Workshop 2011)
87.	2011/11/21	The Great Eastern Japanese Earthquake and tsunami of 11 March 2011 and the research we are doing in South African gold mines. (AfricaArray Workshop 2011)
88.	2011/03/21	Water-ingress induced seismicity in mines in Japan, India and South Africa (ICDP Workshop "Scientific Deep Drilling to Study Reservoir Triggered Earthquakes at Koyna, India)
89.	2011/03/21	Water-ingress induced seismicity in mines in Japan, India and South Africa. (ICDP Workshop "Scientific Deep Drilling to Study Reservoir Triggered Earthquakes at Koyna, India)
90.	2007	Monitoring of rock mass behavior at the closest proximity to hypocenters in South African gold mines (Scientific Drilling)
91.	2006/12	An Attempt to Monitor Stress/ Physical-property at Hypocenters, Using Tidal Response, Mponeng Gold Mine, South Africa
92.	2006/12	Small Slow-Strain Steps and Their Forerunners Observed in Gold Mine, South Africa
93.	2006/12	Stress Drop and Radiated Seismic Energy of Microearthquakes Involving Volume Change in a South African Gold Mine
94.	2006/05	Monitoring of rock mass behavior at the closest proximity of hypocenters in South African gold mines
95.	2005/12	Apparent Stress and Rupture Speed of Small Earthquakes in a South African Gold Mine : Constraints on Fracture Energy
96.	2004/12	Semi-controlled Earthquake-generation Experiments to Monitor the Entire Life Span of an Earthquake in South African Deep Gold Mines
97.	2003/12	Determination of Fault Planes and Rupture Velocities of Small Earthquakes in a South African Gold Mine: Constraints on Radiation Efficiency
98.	2003/07	Coseismic and postseismic strain change recorded with an Ishii strain meter by continuous 24bit 25Hz monitoring on seismogenic fault of M<3 in deep gold mines
99.	2003/07	Semi-controlled earthquake-generation experiments in South African deep gold mines (2002 - 2006)
100.	2002/12	Rupture Velocities of Small Earthquakes (0.0 < M < 1.5) in a South African Gold Mine: Constraints on Fracture Energy
101.	2002/12	Stress Change Prior to the Major Events in the 1989 Earthquake Swarm off the Eastern Izu Peninsula
102.	2002/11	Strain change associated with M2~3 earthquake at ~100 m from an Ishii strainmeter at a South African mine
103.	2002/11	Spotted Dick Dyke at Tau Tona mine, South Africa: earthquake, strain and stress monitoring
104.	2002/11	Rupture velocity of earthquakes with M=0.0-1.5
105.	2002/11	Semi-controlled earthquake prediction experiment at South African gold mines
106.	2002/11	Reduction of non-caulsa artifact in strain change just prior to seismic events and post-seismic deformation
107.	2002/09	A 24-bit 25-Hz continuous monitoring of strain on a fault where an M>3 is expected (1): Bambanani mine, Welkom
108.	2002/09	A 24-bit 25-Hz continuous monitoring of strain on a fault where an M>3 is expected (2): on the Trough dyke at Mponeng mine, Carletonville, South Africa
109.	2002/09	Semi-controlled earthquake-generation experiments in South African deep gold mines (2002 - 2006).
110.	2002/05	Reduction of the near-surface effect on the ACROSS signal recorded by receivers at far-field
111.	2002/05	Strain transients before and after earthquakes smaller than 2 monitored with Ishii's strain
112.	2002/05	25 Hz 24 bit continuous monitoring of strain on M3 seismogenic fault at Mponeng mine, South Africa with Ishii's strain meter
113.	2002/05	Protection, prevention and prediction of mining induced earthquakes in South African deep gold mines
114.	2002/02	A preliminary report on continuous 24-bit 25-Hz strain monitoring on seismogenic faults of M~3 in deep gold mines.
115.	2002/02	A key point of potential future hypocenter fault studies in deep mines: a report on a scientific tour of RaSiM5
116.	2001/06	A simple observation of friction history during stick-slips with a maximum slip rate of
117.	2001/06	Stress in earthquake developing region observed via energy index; Semi-controlled
118.	2001/06	The slow initial phase generated by microearthquakes - Semi-controlled Experiment in
119.	2001	Seismogenic process monitoring at several meters
120.	2001	Semi-controlled seismogenic experiments in South African deep gold mines. The Fifth International Symposium on Rockburst and Seismicity in Mines.
121.	2000/12	Semi-controlled seismogenic experiment in South African deep gold mines
122.	2000/12	Triggers of microseismicity in an abandoned, flooded rockburst-mine
123.	2000/06	A model to account for the power law and exponential decay of event rate
124.	2000/06	The decay in stress preceding the major event during the loading: two case studies in South African deep gold mine and 1989 Izu east off earthquake swarm
125.	1999/12	Semi-Controlled Experiment in a Gold Mine in South Africa: Observations of Shear Wave Splitting and Anisotropy of the Upper Crust
126.	1999/11	Shear wave splitting in a gold mine in South Africa
127.	1999/11	Strength controls exponential or power-law decay of AE activity: comparison of AE experiment with temperature simulation
128.	1999/11	The changes in energy index and apparent volume prior to M2 event at a distance about 100m.
129.	1999/11	The mechanism of AE and the exponential and power-law decay of activity observed in the rice cooker experiment
130.	1999/11	The space/time b-value variation and the related waveform variations
131.	1999	A model to account for the power law and exponential decay of event rate
132.	1998/12	Semi-controlled experiment for earthquake generation process in South African deep gold mine
133.	1997/08	Co-seismic self-potential change during M7.2 Earthquake at an epicentral distance of 67 km
134.	1997/08	Comparison of mining-induced earthquakes with natural earthquakes considering the relationship between moment and corner frequency
135.	1997/08	Comparison of the electric self-potential postseismic changes of M7.2 earthquake with multidisciplinary observations
136.	1997/08	Microearthquake activity triggered by the strong ground motion of the M7.2 earthquake
137.	1997/08	The relationship between self-potential, groundwater level and crustal strain
138.	1997/03	The changes in Electric self-potential before and after 1995 Hyogo-ken Nanbu earthquake
139.	1997/03	The electric self-potential change in a band from 0.01 Hz to 1 kHz observed at an epicentral distance of 67 km during the 1995 Hyogo-ken Nambu earthquake (M7.2)
140.	1994/01	Seismicity at a closed mine induced by heavy rain fall and its interpretation by comprehensive observation (Abstract, International Assembly of Seismology and Physics of the Earth's Interior)
141.	1993/09	Comprehensive observation for earthquake predition at a closed mine (Abstract, International Workshop on Electromagnetic Phenomena Related to Earthquake Prediction)
142.	1992/08	The flexure enar subduction zone estimated from in-situ stress measurements (29th Internat. Geol. Cong., Kyoto.)
143.	1989/05	An attmpt of the interpretation of the tectonics based on in-situ stress,crustal strain and focal mechanism (The proceedings of Sino-Japan Conference on Seismological Research)