Search Results - "KOIKE, Katsuaki"

Applicability of computer-aided comprehensive tool (LINDA: LINeament Detection and Analysis) and shaded digital elevation model for characterizing and interpreting morphotectonic features from lineaments by Masoud, Alaa, Koike, Katsuaki

“…Detection and analysis of linear features related to surface and subsurface structures have been deemed necessary in natural resource exploration and earth…”
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Joint Clarification of Contaminant Plume and Hydraulic Transmissivity via a Geostatistical Approach Using Hydraulic Head and Contaminant Concentration Data by Takai, Shizuka, Shimada, Taro, Takeda, Seiji, Koike, Katsuaki

“…To enable proper remediation of accidental groundwater contamination, the contaminant plume evolution needs to be accurately estimated. In the estimation,…”
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Estimating fractured rock effective permeability using discrete fracture networks constrained by electrical resistivity data by Wu, Jin, Goto, Tada-nori, Koike, Katsuaki

“…Although the permeability of fractured rock mass is a fundamentally important property for the safe construction of civil and mining engineering structures…”
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An Ancient >200 m Cumulative Normal Faulting Displacement Along the Futagawa Fault Dextrally Ruptured During the 2016 Kumamoto, Japan, Earthquake Identified by a Multiborehole Drilling Program by Shibutani, Susumu, Lin, Weiren, Sado, Koichiro, Aizawa, Akihiro, Koike, Katsuaki

“…The Mw 7.0 mainshock of the 2016 Kumamoto earthquake sequence was triggered by dextral rupture of the Futagawa fault within the Aso volcanic region,…”
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Auto-detection and integration of tectonically significant lineaments from SRTM DEM and remotely-sensed geophysical data by Masoud, Alaa A., Koike, Katsuaki

“…► Techniques are developed for auto-detection and analysis of tectonic lineaments. ► Remotely-sensed gravity, magnetic, and DEM grids over Egypt are the base…”
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Selecting the Best Band Ratio to Estimate Chlorophyll-a Concentration in a Tropical Freshwater Lake Using Sentinel 2A Images from a Case Study of Lake Ba Be (Northern Vietnam) by Ha, Nguyen Thi Thu, Thao, Nguyen Thien Phuong, Koike, Katsuaki, Nhuan, Mai Trong

“…This study aims to develop a method to estimate chlorophyll-a concentration (Chla) in tropical freshwater lake waters using in situ data of Chla, water…”
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Spatial gradients of geomagnetic temporal variations causing the instability of inter-station transfer functions by Sato, Shinya, Goto, Tada-nori, Koike, Katsuaki

“…Spatial gradients in the primary geomagnetic fields directly contribute to both the amplitudes and phases of inter-station transfer functions (IS-TFs). This…”
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Application of lineament density extracted from dual orbit of synthetic aperture radar (SAR) images to detecting fluids paths in the Wayang Windu geothermal field (West Java, Indonesia) by Saepuloh, Asep, Haeruddin, Haeruddin, Heriawan, Mohamad Nur, Kubo, Taiki, Koike, Katsuaki, Malik, Dwiyogarani

“…•Increased extraction accuracy of fracture-related lineaments from SAR pair data.•Fractures acting as geothermal fluid paths with high permeability were…”
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Detecting groundwater level changes related to the 2016 Kumamoto Earthquake by Yamamoto, Shun, Koike, Katsuaki, Yamashiki, Yosuke Alexandre, Shimada, Jun

“…This study presented the first attempt to detect precursory changes in groundwater level before the 2016 Kumamoto Earthquake. This detection was achieved by…”
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Correlation between induced polarization and sulfide content of rock samples obtained from seafloor hydrothermal mounds in the Okinawa Trough, Japan by Ohta, Yusuke, Goto, Tada-nori, Koike, Katsuaki, Kashiwaya, Koki, Lin, Weiren, Tadai, Osamu, Kasaya, Takafumi, Kanamatsu, Toshiya, Machiyama, Hideaki

“…The physical properties of seafloor massive sulfides are crucial for interpreting sub-seafloor images from geophysical surveys, shedding light on the evolution…”
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Utilization and Effectiveness of Numerical Simulation Based on a Cold-Water Trapping Mechanism for Epithermal Gold Exploration by Takahashi, Hiroshi, Tomita, Shohei Albert, Koike, Katsuaki, Yoshiyama, Hiroo

“…Exploration of low-sulfidation epithermal Au deposits is expected to increase because these deposits are economically competitive and globally occurring as…”
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Geological Modeling and Numerical Simulation of Cold-Water Trap in the Low-Sulfidation Epithermal Sirawai Au–Ag Deposit, Mindanao, Philippines by Takahashi, Hiroshi, Tomita, Shohei Albert, Koike, Katsuaki, Yoshiyama, Hiroo

“…For low-sulfidation epithermal deposits, which are globally significant sources of Au and Ag, we propose a new multi-stage ore-deposition mechanism initiated…”
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Landsat 8/OLI Two Bands Ratio Algorithm for Chlorophyll-A Concentration Mapping in Hypertrophic Waters: An Application to West Lake in Hanoi (Vietnam) by Ha, Nguyen Thi Thu, Koike, Katsuaki, Nhuan, Mai Trong, Canh, Bui Dinh, Thao, Nguyen Thien Phuong, Parsons, Michael

“…Monitoring chlorophyll-a concentration (Chl-a) in inland waters, particularly hypertrophic lake waters in megacities, is a critically important environmental…”
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Advanced characterization of hydrothermal flows within recharge and discharge areas using rare earth elements, proved through a case study of two-phase reservoir geothermal field, in Southern Bandung, West Java, Indonesia by Shoedarto, Riostantieka Mayandari, Tada, Yohei, Kashiwaya, Koki, Koike, Katsuaki, Iskandar, Irwan

“…•Shallow groundwater flow system can be interpreted in detail from REE features.•REEs support mixing and water–rock interaction processes in recharge flow.•REE…”
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Morphotectonics inferred from the analysis of topographic lineaments auto-detected from DEMs: Application and validation for the Sinai Peninsula, Egypt by Masoud, Alaa A., Koike, Katsuaki

“…Morphotectonic lineaments observed on the Sinai Peninsula in Egypt were auto-detected from Shuttle Radar Topography Mission 90-m digital elevation model (DEM)…”
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Controls on radon emission from granite as evidenced by compression testing to failure by Koike, Katsuaki, Yoshinaga, Tohru, Suetsugu, Kenta, Kashiwaya, Koki, Asaue, Hisafumi

“…A set of uniaxial compression tests of granite specimens taken from five localities across Japan was conducted to identify the factors controlling the quantity…”
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Spatial variations of tritium concentrations in groundwater collected in the southern coastal region of Fukushima, Japan, after the nuclear accident by Kashiwaya, Koki, Muto, Yuta, Kubo, Taiki, Ikawa, Reo, Nakaya, Shinji, Koike, Katsuaki, Marui, Atsunao

“…Spatial variations in tritium concentrations in groundwater were identified in the southern part of the coastal region in Fukushima Prefecture, Japan. Higher…”
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Detection of Near-Surface Permeable Zones Based on Spatial Correlation Between Radon Gas Concentration and DTM-Derived Lineament Density by Heriawan, Mohamad Nur, Syafi’i, Ahmad Ali, Saepuloh, Asep, Kubo, Taiki, Koike, Katsuaki

“…Radon-222 (Rn) concentrations in soil gas have been used to locate near-surface permeable zones (e.g., fractures, faults) along which hydrothermal fluids…”
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Electrical conductive fluid-rich zones and their influence on the earthquake initiation, growth, and arrest processes: observations from the 2016 Kumamoto earthquake sequence, Kyushu Island, Japan by Aizawa, Koki, Takakura, Shinichi, Asaue, Hisafumi, Koike, Katsuaki, Yoshimura, Ryokei, Yamazaki, Ken’ichi, Komatsu, Shintaro, Utsugi, Mitsuru, Inoue, Hiroyuki, Tsukamoto, Kaori, Uyeshima, Makoto, Koyama, Takao, Kanda, Wataru, Yoshinaga, Tohru, Matsushima, Nobuo, Uchida, Kazunari, Tsukashima, Yuko, Matsushima, Takeshi, Ichihara, Hiroshi, Muramatsu, Dan, Teguri, Yoshiko, Shito, Azusa, Matsumoto, Satoshi, Shimizu, Hiroshi

“…Crustal earthquake ruptures tend to initiate near fluid-rich zones. However, it is relatively unknown whether fluid-rich zones can further promote or arrest…”
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Effectiveness of Neural Kriging for Three-Dimensional Modeling of Sparse and Strongly Biased Distribution of Geological Data with Application to Seafloor Hydrothermal Mineralization by Koike, Katsuaki, Yono, Oak, de Sá, Vitor Ribeiro, Tomita, Shohei Albert, Nozaki, Tatsuo, Takaya, Yutaro, Komori, Shogo

“…Three-dimensional modeling of geoscientific data of limited amounts and strongly biased locations is difficult and impractical using almost any method. To…”
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