A5041794204- Geochemistry and Geologic Mapping
- Soil Geostatistics and Mapping
- Geophysical and Geoelectrical Methods
- Mineral Processing and Grinding
- Geological Modeling and Analysis
- Hydrocarbon exploration and reservoir analysis
- Groundwater flow and contamination studies
- Seismic Imaging and Inversion Techniques
- Groundwater and Watershed Analysis
- earthquake and tectonic studies
- Landslides and related hazards
- Geophysical Methods and Applications
- Remote-Sensing Image Classification
- Rock Mechanics and Modeling
- Seismic Waves and Analysis
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Groundwater and Isotope Geochemistry
- Geological and Geophysical Studies
- Hydraulic Fracturing and Reservoir Analysis
- Earthquake Detection and Analysis
- Geothermal Energy Systems and Applications
- Reservoir Engineering and Simulation Methods
- Remote Sensing in Agriculture
- Methane Hydrates and Related Phenomena
- Remote Sensing and Land Use
Kyoto University
2016-2025
Kyoto Katsura Hospital
2015-2024
Graduate School USA
2015-2020
Grantmakers for Effective Organizations
2017-2020
Kyoto University of Education
2020
Chugoku Electric Power (Japan)
2019
Kumamoto University
2004-2014
Japan Atomic Energy Agency
2011
Mitsubishi Materials (Japan)
2011
New Frontier
2007-2010
This study aims to develop a method estimate chlorophyll-a concentration (Chla) in tropical freshwater lake waters using situ data of Chla, water reflectance, and concurrent Sentinel 2A MSI imagery (S2A) over Lake Ba Be, Ramsar site the largest natural Vietnam. Data from 30 surveyed sampling sites June 2016 May 2017 demonstrated appropriateness S2A green-red band ratio (band 3 versus 4) for estimating Chla. was shown through strong correlation corresponded field measured reflectance with...
Water containing high concentrations of nitrate is unfit for human consumption and, if discharging to freshwater or marine habitats, can contribute algal blooms and eutrophication. The level contamination in groundwater two densely populated, agro-industrial areas the Cameroon Volcanic Line (CVL) (Banana Plain Mount area) was evaluated. A total 100 samples from boreholes, open wells springs (67 Banana Plain; 33 only, were collected April 2009 January 2010 analyzed chemical constituents,...
Monitoring chlorophyll-a concentration (Chl-a) in inland waters, particularly hypertrophic lake waters megacities, is a critically important environmental issue. To enable long-term Chl-a monitoring using Landsat series sensors, development of estimation algorithm for the new sensor requisite. This study aims to identify most accurate 8 images and situ data from West Lake nine other lakes Hanoi (Vietnam's capital). The best was obtained by ratio two reflectances at 562 483 nm, corresponding...
Sea eutrophication is a natural process of water enrichment caused by increased nutrient loading that severely affects coastal ecosystems decreasing quality. The degree can be assessed chlorophyll-a concentration. This study aims to develop remote sensing method suitable for estimating concentrations in tropical waters with abundant phytoplankton using Moderate Resolution Imaging Spectroradiometer (MODIS)/Terra imagery and improve the spatial resolution MODIS/Terra-based estimation from 1 km...
Blurred resistivity boundaries resulting from smoothness-regularized inversions of electrical tomography (ERT) data can lead to inaccurate interpretations sharp boundary structures. To address this issue, various ERT inversion algorithms have introduced localized adjustments (localized discontinuities) in the regularization operator at positions where are anticipated. Current approaches rely on prior information about locations, obtained complementary geophysical, geological, and drilling...
Abstract The geothermometric characterization of medium to low-temperature geothermal fields plays a crucial role in resource assessment by providing estimates subsurface temperatures based on the chemical compositions thermal fluids. However, these methods are frequently challenged mineral equilibria and secondary processes that occur at low as reservoir fluids rise surface. This study explores intricacies saturation indices valuable indicators equilibrium, aiming achieve comprehensive...
This study demonstrates how the radon-222 (222Rn) concentration of soil gas at an active fault is sensitive to cumulative recent seismicity by examining seven faults in western Japan. The 222Rn was found correlate well with total earthquake energy within a 100-km radius each fault. phenomenon can probably be ascribed increase pore pressure around source depth shallow caused frequently induced strain. enhance ascent velocity carrier as governed Darcy's law. Anomalous concentrations are likely...
Abstract Although seafloor massive sulfide (SMS) deposits are crucially important metal resources that contain high‐grade metals such as copper, lead, and zinc, their internal structures generation mechanisms remain unclear. This study obtained detailed near‐seafloor images of electrical resistivity in a hydrothermal field off Okinawa, southwestern Japan, using deep‐towed marine tomography. The image clarified semi‐layered structure, interpreted SMS exposed on the seafloor, another...
Deep-sea massive sulfide deposits formed by hydrothermal fluid circulation are potential metal resources. They can exist not only as mound manifestations on the seafloor (seafloor sulfides) but also embedded anomalies buried beneath (embedded sulfides). The distribution of sulfides is largely unknown, despite their expected high economic value. Recent drilling surveys have revealed a complex model suggesting coexist sulfides. In coexisting case, geophysical methods required to distinguish...