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Wakahama, Hiroshi*; Nojo, Haruka*; Aoki, Kazuhiro; Imai, Hirotaro; Guglielmi, Y.*; Cook, P.*; Soom, F.*
Oyo Chishitsu, 64(5), p.236 - 254, 2023/12
Upon the Hamadori earthquake (Mw 6.7) of 11 April 2011, coseismic surface deformation of 14 km running NNW to SSE in southeast Fukushima Prefecture occurred and was newly named the Shionohira Fault. However, no surface deformation was observed along the Kuruma Fault which is a southern extension of the Shionohira Fault. Fault injection tests using SIMFIP method at the Shionohira site on the former active segment and the Minakamikita site on the latter inactive segment were conducted to evaluate the activity of the two faults. Based on hydraulic responses to water injection into the fault rupture zone in the monitoring boreholes at the two sites, hydraulic properties of the area across the fault zone were estimated using the GRF model (Barker, 1988). The results obtained on hydraulic conductivity, specific storage and flow dimension were consistent with those in the domestic and international literature. The hydraulic conductivity and specific storage were larger in Shionohira than in Minakamikita. The flow dimension of Shionohira was three-dimensional, while that of Minakamikita was found to be a two-dimensional fractional flow. In addition, it is understood that the volumetric expansion occurs in the former site in the triaxial direction and the latter in the uniaxial with the comparison between the uniaxial expansion coefficient calculated from the results of SIMFIP displacement measurements and the specific storage in the hydraulic analysis. The difference in the hydraulic parameters between the two sites corresponded to the difference in the spatial development of fractures considered to be the "water passway," indicating the possibility of a correlation between the parameters and the different possible causes for fault activity at the two sites.
Johansen, M. P.*; Child, D. P.*; Collins, R.*; Cook, M.*; Davis, J.*; Hotchkis, M. A. C.*; Howard, D. L.*; Howell, N.*; Ikeda, Atsushi; Young, E.*
Science of the Total Environment, 842, p.156755_1 - 156755_11, 2022/10
Times Cited Count：5 Percentile：50.82(Environmental Sciences)Guglielmi, Y.*; Aoki, Kazuhiro; Cook, P.*; Soom, F.*; Cappa, F.*; Tanaka, Yukumo
Tectonophysics, 819, p.229084_1 - 229084_22, 2021/11
Times Cited Count：1 Percentile：10.41(Geochemistry & Geophysics)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.
-octylnitrilo-triacetamide (HONTA) complexes of americium and europiumToigawa, Tomohiro; Peterman, D. R.*; Meeker, D. S.*; Grimes, T. S.*; Zalupski, P. R.*; Mezyk, S. P.*; Cook, A. R.*; Yamashita, Shinichi*; Kumagai, Yuta; Matsumura, Tatsuro; et al.
Physical Chemistry Chemical Physics, 23(2), p.1343 - 1351, 2021/01
Times Cited Count：14 Percentile：82.54(Chemistry, Physical)The candidate An(III)/Ln(III) separation ligand hexa--octylnitrilo-triacetamide (HONTA) was irradiated under envisioned SELECT (Solvent Extraction from Liquid waste using Extractants of CHON-type for Transmutation) process conditions using a solvent test loop in conjunction with cobalt-60 gamma irradiation. We demonstrate that HONTA undergoes exponential decay with increasing gamma dose to produce a range of degradation products which have been identified and quantified by HPLC-ESI-MS/MS techniques. The combination of HONTA destruction and degradation product ingrowth, particularly dioctylamine, negatively impacts the extraction and back-extraction of both americium and europium ions. The loss of HONTA was attributed to its reaction with the solvent (
-dodecane) radical cation of 
(HONTA + R
) = (7.61 
0.82) 
10
M
s obtained by pulse radiolysis techniques. However, when this ligand is bound to either americium or europium ions, the observed -dodecane radical cation kinetics increase by over an order of magnitude. This large reactivity increase to additional reaction pathways occurring upon metal-ion binding. Lastly nanosecond time-resolved measurements showed that both direct and indirect HONTA radiolysis yielded the short-lived (
100 ns) HONTA radical cation as well as a longer-lived (
s) HONTA triplet excited state. These HONTA species are important precursors to the suite of HONTA degradation products observed.
Mg; Intruder amplitudes in 
Ne and implications for the binding of 
FFallon, P.*; Rodriguez-Vieitez, E.*; Macchiavelli, A. O.*; Gade, A.*; Tostevin, J. A.*; Adrich, P.*; Bazin, D.*; Bowen, M.*; Campbell, C. M.*; Clark, R. M.*; et al.
Physical Review C, 81(4), p.041302_1 - 041302_5, 2010/04
Times Cited Count：40 Percentile：88.58(Physics, Nuclear)no abstracts in English
Mg and AlTripathi, V.*; Tabor, S. L.*; Mantica, P. F.*; Utsuno, Yutaka; Bender, P.*; Cook, J.*; Hoffman, C. R.*; Lee, S.*; Otsuka, Takaharu*; Pereira, J.*; et al.
Physical Review Letters, 101(14), p.142504_1 - 142504_4, 2008/10
Times Cited Count：52 Percentile：86.42(Physics, Multidisciplinary)no abstracts in English
NaEttenauer, S.*; Zwahlen, H.*; Adrich, P.*; Bazin, D.*; Campbell, C. M.*; Cook, J. M.*; Davies, A. D.*; Dinca, D.-C.*; Gade, A.*; Glasmacher, T.*; et al.
Physical Review C, 78(1), p.017302_1 - 017302_4, 2008/07
Times Cited Count：13 Percentile：63.11(Physics, Nuclear)no abstracts in English
proton hole strength in neutron-rich 
P; Shell structure and nuclear shapes near 
=28Riley, L. A.*; Adrich, P.*; Baugher, T. R.*; Bazin, D.*; Brown, B. A.*; Cook, J. M.*; Cottle, P. D.*; Diget, C. A.*; Gade, A.*; Garland, D. A.*; et al.
Physical Review C, 78(1), p.011303_1 - 011303_5, 2008/07
Times Cited Count：25 Percentile：79.03(Physics, Nuclear)no abstracts in English
MgTripathi, V.*; Tabor, S. L.*; Bender, P.*; Hoffman, C. R.*; Lee, S.*; Pepper, K.*; Perry, M.*; Mantica, P.*; Cook, J. M.*; Pereira, J.*; et al.
Physical Review C, 77(3), p.034310_1 - 034310_8, 2008/03
Times Cited Count：32 Percentile：83.76(Physics, Nuclear)Excited states in Mg have been observed from a 
-decay experiment of Na which was performed at National Superconducting Cyclotron Laboratory in Michigan State University. The 2.1 MeV state proposed previously was denied because the corresponding 
ray is found to be located elsewhere. New level scheme is proposed and compared with the Monte Carlo shell model by JAEA. The ground state of Na appears to be a negative parity states from the decay pattern and the calculation. We suggested that the configuration of the states which are strongly populated via the decay is 3p-3h, since the ground state of the parent nucleus is most likely 2p-3h character.
Mg; Mapping the transition into the "island of inversion"Terry, J. R.*; Brown, B. A.*; Campbell, C. M.*; Cook, J. M.*; Davies, A. D.*; Dinca, D.-C.*; Gade, A.*; Glasmacher, T.*; Hansen, P. G.*; Sherrill, B. M.*; et al.
Physical Review C, 77(1), p.014316_1 - 014316_12, 2008/01
Times Cited Count：77 Percentile：95.29(Physics, Nuclear)no abstracts in English
Tripathi, V.*; Tabor, S. L.*; Mantica, P. F.*; Utsuno, Yutaka; Bender, P.*; Cook, J. M.*; Hoffman, C. R.*; Lee, S.*; Otsuka, Takaharu*; Pereira, J.*; et al.
Physical Review C, 76(2), p.021301_1 - 021301_5, 2007/08
Times Cited Count：27 Percentile：82.64(Physics, Nuclear)no abstracts in English
Mg; Interplay of normal and intruder configurations at the neutron-rich boundary of the "Island of Inversion"Gade, A.*; Adrich, P.*; Bazin, D.*; Bowen, M. D.*; Brown, B. A.*; Campbell, C. M.*; Cook, J. M.*; Ettenauer, S.*; Glasmacher, T.*; Kemper, K. W.*; et al.
Physical Review Letters, 99(7), p.072502_1 - 072502_4, 2007/08
Times Cited Count：76 Percentile：90.35(Physics, Multidisciplinary)no abstracts in English
Terry, J. R.*; Basin, D.*; Brown, B. A.*; Campbell, C. M.*; Church, J. A.*; Cook, J. M.*; Davies, A. D.*; Dinca, D.-C.*; Enders, J.*; Gade, A.*; et al.
Physics Letters B, 640(3), p.86 - 90, 2006/09
Times Cited Count：59 Percentile：93.13(Astronomy & Astrophysics)no abstracts in English
Seshimo, Kazuyoshi; Watanabe, Takahiro; Aoki, Kazuhiro; Tanaka, Yukumo; Guqlielmi, Y.*; Cook, P.*
no journal, ,
Watanabe, Takahiro*; Tanaka, Yukumo; Aoki, Kazuhiro; Guglielmi, Y.*; Cook, P.*; Soom, F.*; Wakahama, Hiroshi*; Nojo, Haruka*; Iwasaki, Etsuo*; Kametaka, Masao*; et al.
no journal, ,
no abstracts in English
Aoki, Kazuhiro; Tanaka, Yukumo; Yoshida, Takumi; Seshimo, Kazuyoshi; Guglielmi, Y.*; Cook, P.*; Soom, F.*
no journal, ,
