A5041412971- earthquake and tectonic studies
- Seismic Imaging and Inversion Techniques
- Rock Mechanics and Modeling
- Drilling and Well Engineering
- High-pressure geophysics and materials
- Geological and Geochemical Analysis
- Seismic Waves and Analysis
- Methane Hydrates and Related Phenomena
- Hydrocarbon exploration and reservoir analysis
- Seismology and Earthquake Studies
- Hydraulic Fracturing and Reservoir Analysis
- Geological and Geophysical Studies
- Geophysical Methods and Applications
- Earthquake Detection and Analysis
- Geotechnical and Geomechanical Engineering
- Landslides and related hazards
- Geophysical and Geoelectrical Methods
- Geology and Paleoclimatology Research
- Geothermal Energy Systems and Applications
- Geological Modeling and Analysis
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Geomechanics and Mining Engineering
- Geotechnical Engineering and Underground Structures
- Mineral Processing and Grinding
- Offshore Engineering and Technologies
Kyoto University
2016-2025
Kyoto Katsura Hospital
2018-2024
Chongqing University
2024
Brookhaven National Laboratory
2018-2022
Japan Agency for Marine-Earth Science and Technology
2010-2020
Hanshin University
2020
Aichi Prefectural Government
2020
Graduate School USA
2017-2020
Kōchi University
2011-2015
China University of Geosciences
2008-2013
The frictional resistance on a fault during slip controls earthquake dynamics. Friction dissipates heat an earthquake; therefore, the temperature after provides insight into level of friction. Japan Trench Fast Drilling Project (Integrated Ocean Program Expedition 343 and 343T) installed borehole observatory 16 months March 2011 moment magnitude 9.0 Tohoku-Oki across where was ~50 meters near trench. After 9 operation, complete sensor string recovered. A 0.31°C anomaly at plate boundary...
We constrain the orientations and magnitudes of in situ stress tensors using borehole wall failures (borehole breakouts drilling‐induced tensile fractures) detected four vertical boreholes (C0002, C0001, C0004, C0006 from NW to SE) drilled Nankai accretionary wedge. The directions maximum horizontal principal (S Hmax ), indicated by azimuths failures, are consistent individual holes, but those C0002 (margin‐parallel S ) nearly perpendicular all other holes (margin‐normal ). Constrained C0001...
Stressed Out Large seismic events such as the 2011 magnitude 9.0 Tohoku-Oki earthquake can have profound effects not just on severity of ground motion and tsunami generation, but also overall state crust in surrounding regions. Lin et al. (p. 687 ) analyzed stress 1 year after compared it with estimated before earthquake. In situ resistivity images were from three boreholes drilled into across plate interface where occurred. Stress values indicate a nearly complete drop following that type...
Abstract This paper describes the first implementation of Δ x = 3.25 km version Energy Exascale Earth System Model (E3SM) global atmosphere model and its behavior in a 40‐day prescribed‐sea‐surface‐temperature simulation (January 20 through February 28, 2020). was performed as part DYnamics Atmospheric general circulation Modeled On Non‐hydrostatic Domains (DYAMOND) Phase 2 intercomparison. Effective resolution is found to be horizontal dynamics grid despite using coarser for physical...
Earthquakes occur by overcoming fault friction; therefore, quantifying resistance is central to earthquake physics. Values for both static and dynamic friction are required, the latter especially difficult determine on natural faults. However, large earthquakes provide signals that can in situ. The Japan Trench Fast Drilling Project (JFAST), an Integrated Ocean Discovery Program expedition, determined stresses collecting data directly from 1–2 years after 2011 M w 9.1 Tohoku earthquake....
A 1.6 km riser borehole was drilled at site C0009 of the NanTroSEIZE, in center Kumano forearc basin, as a landward extension previous drilling southwest Japan Nankai subduction zone. We determined principal horizontal stress orientations from analyses breakouts and drilling‐induced tensile fractures by using wireline logging formation microresistivity images caliper data. The maximum orientation is approximately parallel to convergence vector between Philippine Sea plate Japan, showing...
Predicting the temperature, pressure, and permeability at depth is crucial for understanding natural-state geothermal systems. As direct observations of these quantities are limited to well locations, a reliable methodology that predicts spatial distribution from required. In this study, we developed physics-informed neural network (PINN), which constrains predictions satisfy conservation mass energy, predicting distributions hydrothermal We assessed characteristics proposed method by...
I made measurements of the permanent strain thermal expansion, compressional wave velocity, and density microcracks Inada granite, which was subjected to slow homogeneous temperature change under atmospheric pressure. The implying cumulative amount newly generated opening preexisting appeared distinctly at a between 100° 125°C increased almost exponentially in range from 200°C immediately before α‐β transition quartz (573°C) as peak cycle elevated. At 600°C, further. heightened increased....
Sediment dominated convergent margins typically record substantial horizontal shortening often associated with great earthquakes. The margin south of Japan is arguably one the most extensively investigated and previous studies have documented extensive evidence for accretion shortening. Here, we show results from anelastic strains recovered three partially lithified sediment samples (∼40% porosities) across southwest accretionary prism propose that by extension rather than compression....
To understand the chemical reactions of clay minerals in a fault zone during an earthquake, we analyzed Chelungpu fault, which slipped 1999 Chi‐Chi earthquake. X‐ray diffraction spectroscopy showed that kaolinite and smectite contents were lower black gouge than surrounding gray gouge, breccia, or fracture‐damaged zones. We applied kinetics approach to examine whether dehydroxylation dehydration interlayer water, dehydroxylation, illitization occurred coseismic frictional heating, found...
The impacts of the M9.0 Tohoku Earthquake on deep-sea environment were investigated 36 and 98 days after event. light transmission anomaly in water became atypically greater (∼35%) more extensive (thickness ∼1500 m) near trench axis owing to turbulent diffusion fresh seafloor sediment, coordinated with potential displacement. In addition chemical influx associated sediment diffusion, an (13)C-enriched methane from deep sub-seafloor reservoirs was estimated. This isotopically unusual possibly...
The Taiwan Chelungpu‐fault Drilling Project (TCDP) was undertaken in 2002 to investigate the faulting mechanism of 1999 Chi‐Chi earthquake. Hole B penetrated Chelungpu fault, and recovered core samples from between 948.42 m 1352.60 depth. Three zones, marked 1136mFZ, 1194mFZ 1243mFZ, were recognized as active fault‐zones within fault. Multi‐Sensor Core Logger measurements revealed lower densities higher magnetic susceptibilities black gouge zones all three fault zones. Even though zone that...
The Taiwan Chelungpu‐fault Drilling Project penetrated three fault zones as the Chelungpu system, which slipped during 1999 Chi‐Chi earthquake, discovering disk‐shaped black material (BM disk) within middle and lower in Hole B. microscopic features of BM disks indicated that they were pseudotachylytes, showed high magnetic susceptibility, possibly result intense shearing or temperature conditions. Inorganic carbon content was low, because thermal decomposition carbonate minerals....
We analyzed the distribution of turbidity in seawater near epicenter 2011 Tohoku earthquake ( M w 9.0) as well mineral composition and grain size suspended particles shallow sediments cores from same area. One month after an area where large changes bathymetry accompanied earthquake, we observed a strong anomaly above seafloor (maximum 5 mg/L) that greatly exceeded measured several years before (average 0.59 mg/L). The were composed material similar to surface sediment cores, inferred they...
Abstract Fault rock assemblages reflect interaction between deformation, stress, temperature, fluid, and chemical regimes on distinct spatial temporal scales at various positions in the crust. Here we interpret measurements made hanging‐wall of Alpine during second stage Deep Drilling Project (DFDP‐2). We present observational evidence for extensive fracturing high hydraulic conductivity (∼10 −9 to 10 −7 m/s, corresponding permeability ∼10 −16 −14 m 2 ) extending several hundred meters from...
Estimation of the dynamic shear stress on a fault during an earthquake is important for understanding itself. Using chemical kinetic approach, we examined thermal decomposition carbonate minerals to estimate Taiwan Chelungpu fault, which slipped 1999 Chi‐Chi earthquake. The reaction rate was related temperature by using Arrhenius equation, and kinetics, taking into account change over time caused frictional heating heat conduction, solved finite difference method. deduced be 1.31 MPa,...
and sense of shear, they are categorized as thrust (105/30), left-lateral fault (015/30 -80), right-lateral (195/30 normal (105/5 -10), backthrust (285/40 -50).Ten zones have been recognized between 500 2003 m.We interpret the zone located at around 1111 m being most likely candidate for rupture deformation during Chi-Chi earthquake.The seated 1712 is Sanyi which 600 beneath Chelungpu zone.Ten including faults, strike-slip faults classified Fault System (<1250 m) (>1500 m).According to...