285 research outputs found
Dataset of temperature depth profile measurements and long-term observations in a vertical 700-m-deep borehole in the Aso volcanic region, Japan
No full textTemperature depth profiles measured in November 25, 2018 and temperature temporal variations from October 20, 2019 to March 2, 2020 in the FDB borehole.ファイル「3_Temp comparison data for Fig 7」から不要な図を削除し、ファイル「3_Temp comparison data for Fig 7_Rev.xlsx」に差し替え（2025-08-27）Data files were replaced and added following minor revisions. For details, please refer to "Explanation of revision of data files.docx". (December 24, 2025)軽微な修正のためファイルの差し替えと追加を行った。詳細は「Explanation of revision of data files.docx」を参照。（2025-12-24）1.
Temperature response of water-saturated compact Longmenshan limestone and porous Rajasthan sandstone to changes in confining pressure
No full textThree data sets are stored in this data submission. The first data set includes the temperature response of water-saturated compact Longmenshan limestone (L27) and porous Rajasthan sandstone (RJS) to changes in confining pressure under drained/undrained conditions. The second data set includes the thermal properties of rock-forming minerals and estimations of thermal characteristic time/distance. The third data set includes the internal temperature evolution of the water-saturated sample within 1 s after instantaneous loading in models M-01, M-02 and M03, in which the thermal properties of the solid grains are set to be that of gypsum, average values of the main rock-minerals and α-quartz, respectively.This data set will be used in the following manuscript:
Xiaoqiu Yang, Weiren Lin, Osamu Tadai, Xin Zeng, Junfeng Zhao, Hehua Xu. Theoretical and experimental analyses of temperature responses of water-saturated rocks to changes in confining pressure. Ready to submit to Journal of Geophysical Research: Solid Earth
Integrating borehole-breakout dimensions, strength criteria, and leak-off test results, to constrain the state of stress across the Chelungpu Fault, Taiwan
No full textCurrent stress state and principal stress rotations in the vicinity of the Chelungpu fault induced by the 1999 Chi-Chi, Taiwan, earthquake
No full textThermal conductivity and diffusivity measurements on Alpine Fault rocks, New Zealand
No full textDrill core from Amethyst Tunnel, Hari Hari, Westland, New Zealand, and hand specimens from Stony Creek and Tarpot Creek, Westland, New Zealand, have been measured using Hot Disk in dry and saturated state at different temperatures (25 - 125 deggrees Celsius). Most were measured in bulk mode, some were also measured in anisotropic mode (radial and axial values) to obtain anisotropy coafficient.
Two drill core samples were also measured in dry state at room tomperature using Thermal Conductivity Scanner
Determination of stress state in deep subsea formation by combination of hydraulic fracturing in situ test and core analysis: A case study in the IODP Expedition 319
No full text[1] In situ test of hydraulic fracturing (HF) provides the only way to observe in situ stress magnitudes directly. The maximum and minimum horizontal stresses, SHmax and Shmin, are determined from critical borehole pressures, i.e., the reopening pressure Pr and the shut-in pressure Ps, etc, observed during the test. However, there is inevitably a discrepancy between actual and measured values of the critical pressures, and this discrepancy is very significant for Pr. For effective measurement of Pr, it is necessary for the fracturing system to have a sufficiently small compliance. A diagnostic procedure to evaluate whether the compliance of the employed fracturing system is appropriate for SHmax determination from Pr was developed. Furthermore, a new method for stress measurement not restricted by the system compliance and Pr is herein proposed. In this method, the magnitudes and orientations of SHmax and Shmin are determined from (i) the cross-sectional shape of a core sample and (ii) Ps obtained by the HF test performed near the core depth. These ideas were applied for stress measurement in a central region of the Kumano fore-arc basin at a water depth of 2054?m using a 1.6?km riser hole drilled in the Integrated Ocean Drilling Program (IODP) Expedition 319. As a result, the stress decoupling through a boundary at 1285?m below seafloor was detected. The boundary separates new upper layers and old lower ones with an age gap of ~1.8?Ma, which is possibly the accretionary prism. The stress state in the lower layers is consistent with that observed in the outer edge of accretionary prism
Ultrafast nonequilibrium dynamic process of separate electrons and holes during exciton formation in few-layer tungsten disulfide
No full textFemtosecond transient absorption spectroscopy has been employed to unravel separate initial nonequilibrium dynamic processes of photo-injected electrons and holes during the formation process of the lowest excitons at the K-valley in few-layer tungsten disulfide. Charge carrier thermalization and cooling, as well as concomitant many-body effects on the exciton resonances, are distinguished. The thermalization of holes is observed to be faster than that of electrons. Both of them proceed predominantly via carrier–carrier scattering, as evidenced by the observed dependence of the thermalization time on pump fluences. The fluence dependent time constants also suggest that the subsequent cooling for electrons is probably dominated by acoustic phonons, whereas for holes it is mostly controlled by LO phonons. An extremely fast red- and blue-shift crossover followed by a slow blue-shift of exciton resonance was observed in the temporal evolution of exciton resonances by resonant exciton A excitation. The rapid red-shift could be due to the strong screening of the Coulomb interaction between quasi-free charge carriers in electron–hole plasma. The subsequent slow blue-shift is the net result of the competition among many-body effects in the hot-exciton cooling process. Our findings elucidate the carrier-selective ultrafast dynamics and their many-body effects, underpinning new possibilities for developing optoelectronic devices based on transport properties of a single type of carrier
Downdip azimuth and dip angle of fractures measured from borehole televiewer images in Hole FDB-1 penetrated through the Futagawa fault, SW Japan
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Fracture density for each category observed from drill core samples of Hole FDB-1 penetrated through the Futagawa fault, SW Japan
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