Refine your search:     
Report No.
 - 
Search Results: Records 1-20 displayed on this page of 28

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Save select records

Journal Articles

Characterizing the reactivation mechanisms of coseismic surface ruptures associated with the 2011 Mw 6.7 Fukushima-ken Hamadori earthquake in Japan through borehole hydromechanical testing

Guglielmi, Y.*; Aoki, Kazuhiro; Cook, P.*; Soom, F.*; Cappa, F.*; Tanaka, Yukumo

Tectonophysics, 819, p.229084_1 - 229084_22, 2021/11

The reactivation mechanisms of coseismic surface ruptures associated with the 2011 Mw 6.7 Fukushima-ken Hamadori earthquake in Japan are investigated using in-situ controlled hydraulic injections in subsurface boreholes. Two fault segments were selected for reactivation studies, one across a coseismic rupture, the Shionohira site, and one across a non-coseismically ruptured segment, the Minakami-kita site. A series of water injections in sealed sections of boreholes set across the fault progressively bring the fault to rupture by a step-by-step decrease of the effective normal stress clamping the fault. While the fault is rupturing during these hydraulic stimulations, borehole displacements, fluid pressure and injection flowrate are continuously monitored. Then, the tests were analyzed using fully coupled hydromechanical modeling. The model was calibrated on field data, and a parametric study was conducted to examine the modes of fault reactivation. Coseismic surface rupture of the Shionohira fault showed a pure dilatant slip response to hydraulic tests, while the tectonically un-activated Itozawa fault (South) indicated a complex hybrid response to tests related to both a higher frictional and cohesive strengths of the fault. The analysis of the induced Shionohira slip event showed that it is reasonably modeled as a Coulomb rupture with an eventual dependency of friction on slip velocity, in good accordance with laboratory-derived rate-and-state friction data on the Shinohira gouge samples. In contrast, the Itozawa fault reactivation mechanism appears dominated by tensile failure with limited Coulomb shear failure. Thus, the applied protocol proves to be able to isolate significant differences in fault physical properties and rupture mechanisms between two segments of the same fault system, opening perspectives to better assess near-surface rupture effects, and therefore the safety of structures subject to large earthquakes.

Journal Articles

Synchronized gravitational slope deformation and active faulting; A Case study on and around the Neodani fault, central Japan

Komura, Keitaro*; Kaneda, Heitaro*; Tanaka, Tomoki*; Kojima, Satoru*; Inoue, Tsutomu*; Nishio, Tomohiro

Geomorphology, 365, p.107214_1 - 107214_22, 2020/09

 Times Cited Count:0 Percentile:0.01(Geography, Physical)

On the basis of pit excavations and sediment cores at an off-fault deep-seated gravitational slope deformation (DGSD) site and a trench excavation across the active Neodani fault at a nearby site, we examined the records of DGSD and surface-rupturing paleoearthquakes of the Neodani fault. We found the four most recent DGSD events and the four most recent surface-rupturing earthquakes, respectively and conclude that the ages of events are overlapped each other. We infer that static crustal strain from repeated seismogenic faulting plays an important role in the occurrence of DGSD events, at least in the immediate vicinity of active faults, although coseismic severe shaking would have at least some effect on them. Our case study suggests that off-fault DGSDs can be used to reconstruct or refine the paleoseismic history of a nearby active fault.

JAEA Reports

Compilation of information on spatial distribution and characteristics of faults near coastline, and technologies of survey and assessment for them

Niwa, Masakazu; Nomura, Katsuhiro; Hiura, Yuki

JAEA-Review 2018-010, 40 Pages, 2018/04

JAEA-Review-2018-010.pdf:6.11MB
JAEA-Review-2018-010-appendix(CD-ROM).zip:36.31MB

In the Japanese Islands, coastal area can be proposed as an investigation site for geological disposal of high-level radioactive wastes. For an assessment of fault activity in coastal area, offshore surveys such as acoustic profiling and boring should be examined as well as inland surveys. In addition, adequate understanding spatial distributions and characteristics of faults in the coastal area of Japan will contribute to safety assessment for the geological disposal in such area. In this report, we collected and compiled previous studies focused on spatial distribution, continuity, timing of displacement and recurrence interval of faults near coastline, specifically faults along or across a boundary between land and sea, and technologies of survey and assessment for them.

Journal Articles

Complete $$^{40}$$Ar resetting in an ultracataclasite by reactivation of a fossil seismogenic fault along the subducting plate interface in the Mugi M$'e$lange of the Shimanto accretionary complex, southwest Japan

Tonai, Satoshi*; Ito, Shun*; Hashimoto, Yoshitaka*; Tamura, Hajimu; Tomioka, Naotaka*

Journal of Structural Geology, 89, p.19 - 29, 2016/08

 Times Cited Count:8 Percentile:40.08(Geosciences, Multidisciplinary)

We used the K-Ar ages of clay-sized mineral grains to investigate the timing of activity on the fossil seismogenic Minami-Awa Fault. The K-Ar ages from matrix shale of the m$'e$lange range from 85 to 48 Ma and decrease with decreasing amount of detrital mica. In contrast, the K-Ar ages of an ultracataclasite within the fault core are significantly younger, ranging from 29 to 23 Ma, and are unrelated to grain size. This indicates that $$^{40}$$Ar diffused completely from the ultracataclasite between 29 and 23 Ma. The diffusion of $$^{40}$$Ar in the ultracataclasite was probably caused by frictional heating or high-temperature fluid migration that occurred when the fault was reactivated. The results indicate that seismogenic faults that separate tectonic m$'e$lange from coherent strata in accretionary complex may slip, not only during accretion, but also long after accretion.

Journal Articles

A Study of mechanical stability of support elements and surrounding rock mass during shaft sinking through a fault

Tsusaka, Kimikazu*; Inagaki, Daisuke*; Nago, Makito*; Ijiri, Yuji*

Proceedings of 8th Asian Rock Mechanics Symposium (ARMS-8) (USB Flash Drive), 9 Pages, 2014/10

Journal Articles

Development of structural reliability evaluation method for aged piping considering uncertainty of seismic motions

Sugino, Hideharu*; Ito, Hiroto*; Onizawa, Kunio; Suzuki, Masahide

Nihon Genshiryoku Gakkai Wabun Rombunshi, 4(4), p.233 - 241, 2005/12

The purpose of this research is to establish the reliability evaluation method of aged nuclear power components for seismic events from a viewpoint of long-term use of the existing light water reactor nuclear power plants. For this purpose, we developed a piping failure probability evaluation code "PASCAL-SC" based on probabilistic fracture mechanics, and a probabilistic seismic hazard evaluation code "SHEAT-FM" for calculating the seismic occurrence probability of a plant site, paying attention to aging such as fatigue crack progress by the stress corrosion cracking and seismic load in primary coolant piping system. We proposed the reliability evaluation method of aged piping for seismic events by combination of these codes. Using this method, we evaluated the reliability of a weld line in the PLR(Primary Loop Recirculation system) piping of the BWR model plant for seismic events.

JAEA Reports

User's manual of SECOM2: A Computer code for seismic system reliability analysis

Uchiyama, Tomoaki; Oikawa, Tetsukuni; Kondo, Masaaki; Watanabe, Yuichi*; Tamura, Kazuo*

JAERI-Data/Code 2002-011, 205 Pages, 2002/03

JAERI-Data-Code-2002-011.pdf:8.52MB

This report is a user's manual of seismic system reliability analysis code SECOM2 developed at the JAERI for system reliability analysis, which is one of the tasks of seismic probabilistic safety assessment (PSA) of nuclear power plants (NPPs). The SECOM2 code has many functions such as calculation of component and system failure probabilities for given seismic motion levels at the site of an NPP based on the response factor method, calculation of accident sequence frequencies and the core damage frequency (CDF), importance analysis using various indicators, uncertainty analysis, and calculation of the CDF taking into account the effect of the correlations of responses and capacities of components. These analyses require the fault tree (FT) representing the occurrence condition of the system failures and core damage, information about responses and capacities of the components which compose the FT, and seismic hazard curve for the NPP site as input. This report presents calculation method used in the SECOM2 code and how to use those functions in the SECOM2 code.

JAEA Reports

SHEAT for PC: A Computer code for probabilistic seismic hazard analysis for personal computer, user's manual

Yamada, Hiroyuki; Tsutsumi, Hideaki*; Ebisawa, Katsumi*; Suzuki, Masahide

JAERI-Data/Code 2002-001, 161 Pages, 2002/03

JAERI-Data-Code-2002-001.pdf:6.62MB

no abstracts in English

Journal Articles

Real-time nuclear power plant monitoring with neural network

Nabeshima, Kunihiko; Suzudo, Tomoaki; Suzuki, Katsuo; Tuerkcan, E.*

Journal of Nuclear Science and Technology, 35(2), p.93 - 100, 1998/02

 Times Cited Count:30 Percentile:89.93(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Fault tree analysis of system anomaly leading to red oil explosion in plutonium evaporator

Nomura, Yasushi; R.Leicht*; P.Ashton*

Journal of Nuclear Science and Technology, 31(8), p.850 - 860, 1994/08

 Times Cited Count:4 Percentile:57.35(Nuclear Science & Technology)

no abstracts in English

Journal Articles

Qualitative fault diagnosis in systems with nonintermittent concurrent faults; A Subjective approach

B.H.Far*; *

IEEE Trans. Syst. Man Cybern., 23(1), p.14 - 30, 1993/01

no abstracts in English

JAEA Reports

Journal Articles

A Subjective approach to qualitative fault diagnosis in systems with nonintermittent multiple faults

B.H.Far*; *

1991-Nendo Jinko Chino Gakkai Zenkoku Takai (Dai-5-Kai) Rombunshu, p.685 - 688, 1991/00

no abstracts in English

Journal Articles

Observation of defect clusters in masked thin foil CU by He$$^{+}$$ ion irradiation

*; *; *; ; ;

Proc.XIth Int.Cong.on Electron Microscopy, p.1281 - 1282, 1986/00

no abstracts in English

JAEA Reports

Users' Manual for the FTDRAW Code

; *; *; *

JAERI-M 85-010, 61 Pages, 1985/02

JAERI-M-85-010.pdf:1.38MB

no abstracts in English

Journal Articles

Effect of external stress on the microstructural change during electron-irradiation in nickel

; Katano, Y.; Shiraishi, K.

Journal of Nuclear Science and Technology, 21(9), p.671 - 677, 1984/00

 Times Cited Count:13 Percentile:78.17(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

Users' Manual for the FTA-J(Fault Tree Analysis - JAERI) Code System

; Watanabe, Norio; *; *; *;

JAERI-M 83-169, 160 Pages, 1983/11

JAERI-M-83-169.pdf:4.36MB

no abstracts in English

Journal Articles

Recent progress in safety-related applications of reactor noise analysis

; Shinohara, Yoshikuni; *; *; *; Nishihara, Hideaki*; *; *; Tamura, Seiji*; *

Nihon Genshiryoku Gakkai-Shi, 24(3), p.188 - 198, 1982/00

 Times Cited Count:0 Percentile:0.02(Nuclear Science & Technology)

no abstracts in English

JAEA Reports

The Selection of Safety Evaluation Accident Baced on the Probabilistic Method for VHTR Design

Suzuki, Katsuo

JAERI-M 8736, 151 Pages, 1980/03

JAERI-M-8736.pdf:3.68MB

no abstracts in English

JAEA Reports

28 (Records 1-20 displayed on this page)