著者

佐藤 比呂志 鶴我 佳代子 馬塲 久紀 石山 達也 阿部 進 川崎 慎治 田中 康久 篠原 雅尚 岩崎 貴哉 松原 誠 伊藤 谷生 橋間 昭徳 平田 直 Okaya David

出版者

一般社団法人 日本地質学会

雑誌

日本地質学会学術大会講演要旨 第126年学術大会(2019山口) (ISSN:13483935)

巻号頁・発行日

pp.236, 2019 (Released:2020-08-28)

著者

廣内 大助 竹下 欣宏 松多 信尚 杉戸 信彦 藤田 奈津子 石山 達也 安江 健一

出版者

信州大学

雑誌

基盤研究(B)

巻号頁・発行日

2016-04-01

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本研究では糸魚川ー静岡構造線活断層帯における過去の活動履歴や活動性について,精密な古地震調査や変動地形調査に基づいて明らかにした.とくに従来の予測よりも一回り小さな地震であった2014年地震の発生を受け,同断層帯がどのような活動を示すのかを調査し,活断層の活動特性を明らかにすることを目指した.その結果2014年と同様の一回り小さな地震が1714年にもあった一方,約1000年前にはこれよりも大きな断層活動を示す巨大地震もあり,同断層はタイプの異なる地震を相補的に発生しながら,繰り返してきたことが明らかとなった.

著者

石山 達也

出版者

分子シミュレーション学会

雑誌

アンサンブル (ISSN:18846750)

巻号頁・発行日

vol.15, no.3, pp.179-185, 2013-07-31 (Released:2014-08-26)

参考文献数

28

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水と比べて氷表面では水素結合領域に非常に強い振動スペクトルピークがあらわれる.この特徴的なピークは,強度の差はあるが水表面,あるいは固/水界面においてもみられ,しばしば“ice-like peak”ともよばれている.今回,古典分子動力学シミュレーションとQM/MM 計算をカップルさせることにより,氷特有の強い振動スペクトルピークを再現することに成功した.また,水表面の“ice-like peak”について,最近の実験とシミュレーション研究から明らかになったことを報告する.

著者

野 徹雄 佐藤 壮 小平 秀一 高橋 成実 石山 達也 佐藤 比呂志 金田 義行

出版者

国立研究開発法人海洋研究開発機構

雑誌

JAMSTEC Report of Research and Development (ISSN:18801153)

巻号頁・発行日

vol.19, pp.29-47, 2014

被引用文献数

8

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日本海東縁では,1983年日本海中部地震(M_J7.7)や1993年北海道南西沖地震(M_J7.8)などのM7以上の被害地震,それらに起因する津波が繰り返し発生している.しかし,これらの地震の全体像を研究する上では地殻構造データが十分でなかった.そこで,「ひずみ集中帯の重点的調査観測・研究」の一環として,2009年~2012年の4年にわたり,マルチチャンネル反射法地震探査と海底地震計による屈折法・広角反射法地震探査の地殻構造調査を実施し,地殻構造研究の側面から日本海東縁における地震発生帯の研究を進めた.調査は能登半島沖から西津軽沖にかけての沿岸域の大陸棚から大和海盆・日本海盆に至る海域にて行った.本報告では,本調査で実施された43測線のマルチチャンネル反射法地震探査によるデータ取得の概要とデータ処理の結果について記す.

著者

石山 達也 戸谷 剛 永田 晴紀 稲場 康彦 井上 遼太 佐々木 俊也 寺川 健 桧物 恒太郎 李 尚駿 金井 竜一朗 脇田 督司

出版者

一般社団法人 日本機械学会

雑誌

年次大会

巻号頁・発行日

vol.2012, pp._S192023-1-_S192023-5, 2012

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Although many groups are developing Cansat, a can-sized mock satellite, they have few opportunities to test due to difficulties for students to launch Cansats domestically. To provide the chance to launch Cansats, the authors downsized CAMUI type hybrid rocket and created easy-to-use launch system. The new launcher, miniCAMUI, uses gas oxygen (GOX) as oxidizer and high density polyethylene as fuel. Using GOX instead of liquid oxygen contributes to downsizing and weight saving, reduction of turnaround time for launch due to the simplified procedure to fill the oxidizer. A GOX tank connects to a motor through a valve. An air-driven actuator operates the valve miniCAMUI was launched 6 times in June and July 2012. Three of them were serial successful launches with two rockets in a day, with a turnaround time about 45 minutes. Two of the three launches were with the same rocket in the day. With the wind velocity of 1 to 2 m/s, the apogee altitude was about 74 m, being very close to the predetermined altitude of 80 m. This result shows that miniCAMUI was successfully developed as a small launch system with high operability. miniCAMUI is available for launches to various altitudes below 250 m.

著者

須貝 俊彦 水野 清秀 八戸 昭一 中里 裕臣 石山 達也 杉山 雄一 細矢 卓志 松島 紘子 吉田 英嗣 山口 正秋 大上 隆史

出版者

公益社団法人 東京地学協会

雑誌

地学雑誌 (ISSN:0022135X)

巻号頁・発行日

vol.116, no.3-4, pp.394-409, 2007-08-25 (Released:2009-11-12)

参考文献数

26

被引用文献数

5 9

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The northern Ayasegawa fault is a part of the Fukaya fault system, which is the longest active fault in the Kanto district. The paleoseismology of the northern Ayasegawa fault was revealed by a combination of arrayed boring and ground penetrating radar (GPR) survey. The northern Ayasegawa fault produced a fold scarp with the NW-SE direction running along the boundary between the Oomiya 2 (O2) surface and fluvial lowland. The O2 was formed in Marine Isotope Stage 5a, and was slightly deformed with a wide warping zone. Sixteen sediment cores arrayed across the warping zone contain a series of tephra layers such as Hk-TP (ca. 60-65 ka), KMP, AT (26-29 ka), As-BP group (20-25 ka), and As-YP (15-16.5 ka). These key beds except Hk-TP were deposited and deformed parallel to each other, suggesting that no faulting events occurred between KMP and As-VP fall. The timing of the last faulting event is after the As-YP fall, and is probably younger than 10 ka based on an interpretation of GPR profiles and 14C ages. KMP should be deposited horizontally because it intervened in the peaty silt layer, which accumulated conformably on lacustrine deposits overlapping the fold scarp. Thus, the KMP horizon roughly indicates the vertical offset produced by the events occurred after the As YP fall. The events were probably singular, and the last one formed a vertical offset of more than 4 m. The older event occurred at around 70 ka between Hk-TP fall and O2 formation. Vertical deformation of the O2 was at least 7 m, indicating the possibility that the vertical offset caused by the penultimate event is at least 3 m. The vertical slip per event might reach 5 m, and the average vertical slip rate is nearly 0.1 mm/yr because the warping zone detected by the arrayed boring above is within the flexure zone shown by the P-wave seismic profile. The northern Ayasegawa fault is considered to be a single behavioral segment because of its longer recurrence interval and lower slip rate of 0.1 mm/yr in comparison with those of the other part of the Fukaya fault system.

著者

水野 清秀 杉山 雄一 石山 達也

出版者

海洋出版

雑誌

月刊地球 (ISSN:03873498)

巻号頁・発行日

vol.28, no.1, pp.31-37, 2006-01

被引用文献数

2

著者

岩野 祥子 福田 洋一 石山 達也

出版者

学術雑誌目次速報データベース由来

雑誌

地學雜誌 (ISSN:0022135X)

巻号頁・発行日

vol.110, no.1, pp.44-57, 2001

被引用文献数

1 2

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In order to evaluate the capability of one-dimensional microgravity investigations, we carried out two test surveys across the Katagihara fault in the southwest of Kyoto basin and the Fumotomura fault at the foothills of Suzuka Range. Since seismic reflection survey had already been carried out in these faults, the Bouguer anomaly due to the fault structures was expected in advance at an order of 0.1 mgal across the Katagihara fault and less than 0.1 mgal across the Fumotomura fault. It was also estimated that the spacing of the gravity points should be less than 50 meter to reveal the structures. We therefore conducted precise gravity measurements using a LaCoste & Romberg gravimeter (G-type) at about a 50 meter interval, and also carried out leveling surveys on the same points using a Wild NA3000 digital level. Moreover, we paid much attention for terrain corrections using the 50 meter DEM (Digital Elevation Model) provided by Geographical Survey Institute and partially using a 10 meter DEM compiled by ourselves. Consequently, we achieved 0.1 mgal level precisions for almost all the survey points. Using the gravity anomaly data, density structures in both survey areas were estimated and compared with the structures obtained from seismic reflection survey. The main results are as follows ; (1) comparatively simple structures are obtained to explain the gravity anomaly in the Katagihara fault, (2) the density contrast between the basement and the sedimentary layer is 0.58 g/cm3 in the Katagihara fault, (3) no gravity anomaly due to the displacement on the fault plain is observed in the Fumotomora fault, and (4) possibility of a high density layer is observed beneath the Tokai Group. Although the gravity survey has some limitations and drawbacks, it certainly gives us useful information about the density contrasts. Moreover, one-dimensional gravity survey is quite easy to conduct with very low cost. We therefore recommend that this kind of gravity surveys should be carried out whenever seismic reflection survey is conducted.