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Yamada, Kunimi; Yasue, Kenichi; Iwano, Hideki*; Yamada, Ryuji*; Umeda, Koji; Omura, Kentaro*
no journal, ,
no abstracts in English
Umeda, Koji; Tanikawa, Shinichi; Yasue, Kenichi
no journal, ,
In order to examine tectonically controlled geomorphic changes over time frames of at least 100,000 years, we attempt to estimate stages of geomorphic development using the hypsometric curve model through mountain building resulting from concurrent tectonics and denudation.
Nakayasu, Akio; Doke, Ryosuke; Urabe, Atsushi*; Ono, Eisuke*; Niizato, Tadafumi
no journal, ,
In this study, the factors of the uncertainties occurred in the process of data acquisition for the estimation of uplift rate, which is one of the data for drawing the topographic evolution, are analyzed by using Evidential Support Logic (ESL). The result of this study is assumed to be used as a tool for extracting the factor of uncertainties in the planning of the investigation, and for controlling the quality of results in the implementation of the investigation.
Ishibashi, Masayuki; Tsuruta, Tadahiko; Yuguchi, Takashi; Nishimoto, Shoji*; Sasao, Eiji; Yoshida, Hidekazu*
no journal, ,
no abstracts in English
Niwa, Masakazu
no journal, ,
Larger fault zones are developed as a result of coalescence of multiple faults. To understand fracture zone development in such larger fault zones, we surveyed the spatial distribution and characteristics of fracture zones in areas around the Atotsugawa fault zone in central Japan. Within 500 m of the fault trace, the number of exposed fracture zones increases sharply. Though several concepts have been proposed that fracture zones are pervasively developed around a compressional step where two faults are opposed each other, the number and width of the exposed fracture zones display almost the same pattern between a compressional step and a long strand. Fracture zones less than 2 m width are sparsely but widely distributed in the study area. From a viewpoint of their spatial distribution and deformation structure, the small fracture zones possibly indicate an evidence of shallow earthquakes at a point distant from the fault trace.
Matsuzaki, Tatsuji; Iwatsuki, Teruki; Niizato, Tadafumi; Tokiwa, Tetsuya; Oyama, Takuya; Yabuuchi, Satoshi
no journal, ,
no abstracts in English
Miyakawa, Kazuya; Amano, Yuki; Murakami, Hiroaki; Iwatsuki, Teruki
no journal, ,
no abstracts in English
Yokota, Hideharu; Yamamoto, Yoichi; Tanaka, Shingo
no journal, ,
no abstracts in English
Nohara, Tsuyoshi; Tokiwa, Tetsuya; Ochiai, Shoji
no journal, ,
Evaluation of effect of fault zone is one of the important issues in the geological isolation of high-level radioactive wastes. Based on the result of the geological data in and around the northern Hokkaido Horonobe hill, the outline is arranged about changes of the depositional environment in the past about 3 million years, and the relation with the development process of a fault related fold is considered.
Otani, Tomoyuki*; Yamashita, Mitsumasa*; Kojima, Satoru*; Wakai, Shoji; Kakamu, Kazuhiko
no journal, ,
no abstracts in English
Kondo, Atsuya; Sanada, Yukihisa; Sugita, Takeshi; Torii, Tatsuo
no journal, ,
Sanada, Yukihisa; Kondo, Atsuya; Sugita, Takeshi; Yuki, Yoichi*; Torii, Tatsuo
no journal, ,
Maeda, Koshi*; Fukushi, Keisuke*; Hasegawa, Yusuke*; Yamamoto, Yuhei; Aosai, Daisuke; Mizuno, Takashi
no journal, ,
no abstracts in English
Hasegawa, Yusuke*; Fukushi, Keisuke*; Maeda, Koshi*; Yamamoto, Yuhei; Aosai, Daisuke; Mizuno, Takashi
no journal, ,
no abstracts in English
Sato, Tatsuhiko; Yasuda, Hiroshi*; Kataoka, Ryuho*; Yashiro, Seiji*; Kuwabara, Takao*; Shiota, Daiko*
no journal, ,
When solar energetic particles (SEP) are incident to the atmosphere, they can induce air showers by generating varieties of secondary particles. Such secondary particles can reach conventional flight altitudes (12 km), and hence, aircrews are exposed to enhanced level of radiations. In order to precisely estimate the aircrew doses, the Monte Carlo simulation for air shower is indispensable. We therefore simulated air showers induced by mono-energetic protons, using a general-purpose Monte Carlo particle and heavy ion transport simulation code system PHITS, and developed a database of particle fluxes in the atmosphere. Combining the database with the proton fluxes measured by PAMELA during the GLE event occurred on Dec. 13th 2006, the count rates of the neutron monitor located at Thule were calculated. The calculated count rates agree with the measured data fairly well, verifying the accuracy of our simulation technique.
Kawaguchi, Yuko*; Yang, Y.*; Kawashiri, Narutoshi*; Shiraishi, Keisuke*; Sugino, Tomohiro*; Takahashi, Yuta*; Tanigawa, Yoshiaki*; Narumi, Issei; Sato, Katsuya; Hashimoto, Hirofumi*; et al.
no journal, ,
Katayama, Yoshinori; Saito, Hiroyuki; Aoki, Katsutoshi
no journal, ,
Hydrogen reacts with many kinds of metals and forms metal hydrides. Early transition metals such as Ti and V form hydrides while solubility of hydrogen in other transition metals such as Fe and Ni is low at ambient pressure. However, Fe and Ni absorb hydrogen under high pressure conditions. To study liquid state of transition metal-hydrogen systems, we have performed X-ray diffraction measurements under high-pressure high-temperature conditions for Ti, V, Mn, Fe, Co and Ni. The sample was heated together with hydrogen source at about 4 GPa. We did not observed clear melting for TiH
and VH while we measured X-ray diffraction of liquid transition-hydrogen alloy for Mn, Fe, Co and Ni.
Sano, Asami; Hattori, Takanori; Arima, Hiroshi*; Tabata, Satoshi*; Kondo, Masahiro*; Nakamura, Akihiro*
no journal, ,
Neutron diffraction is a powerful tool to investigate hydrogen in minerals and rocks. New neutron diffraction beamline "PLANET" is currently under construction at BL11 of Materials and Life Science Experimental Facility (MLF) at J-Parka Tokai, Ibaraki. One of the unique features of this beamline is that 6-rams multi-anvil high-pressure apparatus (ATSUHIME) is installed, to generate high pressure and high temperature conditions of earth's mantle. Maximum load of each hydraulic ram is 500-ton. Each rams are controlled independently by six plunger pumps. The press will be installed at experimental hutch at Feb. 2012. I will present the current status of the 6-rams multi-anvil apparatus.
Hattori, Takanori; Sano, Asami; Arima, Hiroshi*; Utsumi, Wataru; Inoue, Toru*; Kagi, Hiroyuki*; Yagi, Takehiko*
no journal, ,
The high-pressure neutron diffractometer PLANET is the new spectrometer dedicated for high-pressure experiments, which is now being constructed in MLF at J-PARC. The main purpose is to investigate the effect of the water on the Earth's dynamics with the help of the neutron. One of the most characteristic features is the huge 6 ram 6 axes press with the maximum centric load to 3000 tonf which enables us to investigate the structure of crystals, liquids and amorphous solids under high-pressure and high-temperature conditions of 20 GPa and 2000 K. We have installed the high-pressure press, ATSUHIME, and the construction of the spectrometer was almost finished. After the last big earthquake, we successfully received the neutron beam again in the last January. We introduce the state of the commissioning and the future plan.
