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Hokkaido University Collection of Scholarly and Academic Papers (135.521 recursos)

HUSCAP (Hokkaido University Collection of Scholarly and Academic Papers) contains peer-reviewed journal articles, proceedings, educational resources and any kind of scholarly works of Hokkaido University.

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Mostrando recursos 1 - 15 de 15

  1. 目次(英語)・奥付


  2. 表紙・編集委員・目次(日本語)


  3. 斜め衝突帯の巨大地震 (1) 相模トラフ

    小山, 順二; 都筑, 基博; 蓬田, 清
    Since the 2011 Tohoku-oki megathrust earthquake, Japan, it has been recognized that there is a variety of megathrust earthquakes occurring in the world not just only the Chilean type megathrust earthquake. In the variation, one end member is the 1960 Chile earthquake and the other is the 2004 Sumatra-Andaman earthquake, while the former is characterized by subduction zone of a young plate forming the Cordilleran orogeny, the latter is by an obliquely subducting plate along a continental margin with active back-arc activity. We study in detail megathrust earthquakes along such oblique subduction zones, considering characteristics of earthquake activities, focal mechanisms,...

  4. 無人ヘリコプターを利用した樽前山の空中磁気測量

    橋本, 武志; 小山, 崇夫; 金子, 隆之; 大湊, 隆雄; 吉本, 充宏; 鈴木, 英一; 柳澤, 孝寿
    The first low-altitude airborne magnetic survey was performed over the summit area of Tarumae Volcano, southwestern Hokkaido, Japan. An unmanned autonomous helicopter was used as the platform for the magnetic survey. Obtained total field anomaly is inverted into a matrix of magnetized prisms, each of which has a uniform magnetization parallel to the present geomagnetic field. Magnetization in the summit atrio ranges from 3 to 8 A/m with an average of 5.3 A/m. The summit lava dome and its vicinity show relatively high magnetization, while the eastern to southwestern part of the atrio is less magnetized. Such variability may be...

  5. 土星プラズマディスクにおけるダスト-プラズマ相互作用

    堺, 正太朗; 渡部, 重十; 諸岡, 倫子; Holmberg, Madeleine; Wahlund, Jan-Erik
    We statistically investigated the ion bulk speeds in the equatorial region of the Saturn’s inner magnetosphere using the Langmuir Probe (LP) onboard the Cassini spacecraft. The LP observations showed that the ion speeds are about 60% of the ideal co-rotation speed at 5 RS and the ions have between co-rotation and Keplerian speed. Beyond 7 RS the ion speeds are spread to be a larger speed and become close to the ideal co-rotation speed. It is suggested that the sub-micron sized negatively charged E ring dust contributes to the plasma dynamics in the plasma disk. We also calculated the ion...

  6. 道東地域の地磁気永年変化と三成分絶対測量

    橋本, 武志; 茂木, 透; 西村, 三治; 有田, 真; 清水, 淳平; 井, 智史; 源, 泰拓; 長町, 信吾
    Localized geomagnetic secular changes have been reported in the eastern Hokkaido, previously by repeat surveys, and more recently, by continuous recording. Some previous studies discuss the piezo-magnetic field due to stress accumulation by plate subduction. To elucidate the nature of such “anomalous” secular changes in the total field, we started geomagnetic three-component absolute measurements. Firstly, we estimated the so-called orientation effect which may be contained in the simple differential total field, by using the results of the absolute measurements. At some stations this effect has been found to be non-negligible.   While correcting the orientation effect, we assessed an effect of...

  7. 珪岩・水晶・溶融石英の破壊に伴う発光の色について -結晶の圧電性の寄与-

    三井, 雄太; 柳谷, 俊
    We observed clear fractoluminescence in crystalline quartzite, quartz crystal and fused silica at uniaxial compressional loading tests by commercial digital cameras. These fractoluminescence are composed of blue and red colors. In particular, a blue color does not appear in fractures of fused silica but appear in crystalline quartzite and quartz crystal, which implies that the piezoelectric charge and discharge play a key role in the blue-color fractoluminescence via excitation of N2 molecules.

  8. ペンマン式およびプレストリ・テーラ式のボーエン比に関する考察

    浦野, 慎一
    The bowen ratios shown in the Penman(1948)(PE) and Priestley-Taylor(1972)(PT) equations, widely used to estimate evaporation rate from saturated surface, were studied theoretically, and a new method was proposed based on the structures of equations.   The PE equation has two terms. The first term X uses the decline of saturation vapor pressure curve Δ, and uses the parameter of γ/Δ ( γ is psychrometric constant) as a substitute for the actual Bowen ratio β. And the second term Υ uses the vapor pressure deficit Δe and wind function f(u), and uses the parameter of Ea (=f(u)Δe) as a substitute for the...

  9. 扇状地の地下水シミュレーションにおける高解像度モデルの有効性

    阪田, 義隆; 池田, 隆司
    Large heterogeneity in an alluvial fan influences considerably on groundwater flow field. Applied to groundwater simulation, however, an alluvial aquifer, consisted of permeable gravelly sediments, is often simplified as a single or a few homogeneous layer(s) due to its complexity, lack of hydrogeological information, and knowledge. In a previous study in the Toyohira alluvial fan, we have formulated a relationship between hydraulic conductivities and auxiliary variables in undisturbed gravelly cores by focusing on the effective grain size diameter and lengths of matrix packing level. In this study, a permeability distribution model with the one-meter resolution was yielded by estimating spatial...

  10. 積雪底面融解量の場所による変化と流域平均量

    石井, 吉之; 佐藤, 大輔
    In regions covered with a thick layer of snow, snow melting occurs at the snow-ground interface during the winter, a process we call snowpack bottom melting (SBM). To examine the spatial variation of the SBM rate and to estimate its watershed average value, field observations were made in a nival mountainous watershed in northern Hokkaido, Japan. Three different methods were adopted to determine the SBM rate, namely, heat flow calculation, snow lysimeter, and snow pit-wall observation methods, and we found the heat flow calculation method to be the most reliable among the three methods. SBM rates were measured using the...

  11. 池田隆司教授記念号の発刊に際して

    池田, 隆司

  12. 携帯型赤外カメラを用いた航空機による地表面温度測定(2006) -有珠火山・登別火山・樽前火山-

    松島, 喜雄; 大島, 弘光; 森, 済; 前川, 徳光; 鈴木, 敦生; 寺田, 暁彦; 鍵山, 恒臣
    As a part of the joint geophysical and geochemical observations of Usu volcano in 2006, the airborne infrared thermal survey was conducted at Usu volcano, Noboribetsu geothermal area and Tarumai volcano. The observation was operated by the helicopter which has a hole on the floor for aerial photo of vertical direction. The portable infrared thermal camera (AVIO TVS-620) was fixed on the hole to face the ground perpendicularly using the stand designed for this survey. The position and horizontal direction of the camera were measured by GPS. The vertical angle of the camera was determined by two crossing electronic clinometers...

  13. 空中赤外観測に基づく噴気地および火口湖面からの放熱量推定 -有珠火山・登別火山・北海道駒ケ岳火山-

    寺田, 暁彦; 吉川, 慎; 大島, 弘光; 前川, 徳光; 松島, 喜雄
    Aerial IR surveys were carried out in September 2010 over geothermal areas at Usu, Noboribetsu and Hokkaido-Komagatake volcanoes, Japan. The heat discharge rate from steaming grounds that formed during the 2000 eruption of Usu volcano is estimated to be 5.6 MW, which is half the rate measured in September 2006. Integration of the heat discharge rate from April 2000 to September 2010 yields an accumulated discharge of approximately 2.4 × 1016 J. This amount of heat corresponds to several percent of the total intruded magma heat estimated from analyses of ground deformation associated with the 2000 eruption. Areas of steaming...

  14. 積雪寒冷地における積雪期の不圧地下水位の変動について

    深見, 浩司
    The fluctuation of unconfined groundwater level for the snow period was examined, using past 30-years data of groundwater level observatory and neighboring meteorological observatory (AMEDAS observatory)in Ishikari Gulf area that was snowy cold region. The relationship between the accumulated precipitation(maximum water equivalent of snow)from the data of the AMEDAS observatory(ΣΡ)and the increase of unconfined groundwater level in snow melt season(ΔΗ) was considerably good. The successive tendency like as decreasing the accumulated precipitation for snow period do not seem to be admitted in the past 30-years.

  15. 山岳氷河の質量・水収支の経年変動

    知北, 和久; 和田, 知之; 工藤, 勲; キム, ヨンオン
    Meteorological and hydrological data for a drainage basin of a mountain glacier, the Gulkana Glacier, Alaska, monitored by U. S. Geological Survey (USGS) for more than 40 yrs, are corrected and retrieved. Interannual variations of daily mean air temperature and daily precipitation near the glacier and daily runoff rate at a proglacial stream averaged over the ablation period (June to September) indicate that the increasing rates of 1968-2010 and 1985-2010 are 0.012 ℃/yr and 0.014 ℃/yr, 0.024 mm/yr and 0.041 mm/yr, and 0.092 mm/yr and 0.25 mm/yr, respectively. Thus, the runoff rate and precipitation tend to increase greatly in the...

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