著者

原口 強 中田 高 島崎 邦彦 今泉 俊文 小島 圭二 石丸 恒存

出版者

一般社団法人 日本応用地質学会

雑誌

応用地質 (ISSN:02867737)

巻号頁・発行日

vol.39, no.3, pp.306-314, 1998-08-10 (Released:2010-03-25)

参考文献数

3

被引用文献数

6 13

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未固結堆積物を定方位で連続的に採取する方法として独自に考案・開発した地層抜き取り装置と, 建設現場ですでに確立している鋼矢板打ち込み工法を組み合わせた定方位連続地層採取方法を提唱する. 本方法の原理は, 2つに分割したサンプラーを2段階に分けて地層中に差し込んで地盤中で閉合した断面を完成させ, それを同時に地盤から引き抜くことにより, その間に挟まれた地層を定方位で採取する方法である.本方法は, 活断層調査の現状における様々な問題点を克服するために開発されたもので, 2つの事例 (糸魚川-静岡構造線活断層系・神城断層と東京都旧江戸川) を示す. 糸魚川-静岡構造線活断層系・神城断層では幅35cm, 厚さ12cm, 深さ約11mの連続する定方位地層断面を2本採取し, 急傾斜する地層を切る小断層がとらえられた. 東京都旧江戸川では水深5mの川底から深さ約9mにわたって完新世の軟弱な未固結堆積層を幅30cmの地層断面として採取し, 縦ずれ量約25cmの連続する正断層状の地割れを含む地層断面を採取した. これらの採取結果から本方法が, 軟弱な未固結堆積物の定方位連続地層採取方法として広範に有効であることが明らかとなった.

著者

竹久夢二 著

出版者

書物展望社

巻号頁・発行日

1941

著者

中村 紀夫

出版者

日本平滑筋学会

雑誌

日本平滑筋学会雑誌 (ISSN:03743527)

巻号頁・発行日

vol.6, no.4, pp.245-262, 1970-12-20 (Released:2010-07-21)

参考文献数

9

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This study presents a new technique to observe the structure of gastric smooth muscle layers by means of the combined use of “mucosa stripping technique” and “nitric acid treatment”. The mucosa stripping technique has been described elsewhere. After the procedure, the specimens are re-emersed into 20% nitric acid solution for 3 to 7 days. By the time, the muscle fibers contract tightly and the interstitial fibrous tissues become swollen and fragil, and they are easily removed by forceps in running water. Leaving muscle structure is solidly delineated.By this method, the author explored the detailed structure of three layers of gastric smooth muscles and individualized the special muscle bundles; namely, “anterior medial oblique muscle bundle”, “posterior medial oblique muscle bundle” and “border circular muscle bundle”. These muscle bundles constitute, so-called, “upper strain zone” in relation to the development of peptic ulcers at about the gastric angulus where almost all uclers locate.Special interest is emphasized on an existence of “lesser curvature longitudinal muscle bundle” which is confined to the area of upper strain zone and tapering off in gradual fusion with the circular muscle bundles. Although, the functional signfiicance of these muscle bundles remains for the future study.

著者

加島 健

出版者

青山学院大学一般教育部会

雑誌

青山学院大学一般教育部会論集 (ISSN:03874370)

巻号頁・発行日

no.29, pp.p141-150, 1988

著者

関谷 〓景

出版者

一般社団法人 日本地質学会

雑誌

地質学雑誌 (ISSN:00167630)

巻号頁・発行日

vol.1, no.2, pp.80-84, 1893 (Released:2008-04-11)

著者

關谷 清景

出版者

一般社団法人 日本地質学会

雑誌

地質学雑誌 (ISSN:00167630)

巻号頁・発行日

vol.1, no.10, pp.501-503, 1894 (Released:2008-04-11)

著者

關谷 清景

出版者

震災豫防調査會

雑誌

震災豫防調査會報告

巻号頁・発行日

vol.26, pp.4-8, 1899-02-08

著者

堀内 勝

出版者

中部大学

雑誌

国際研究 (ISSN:09100156)

巻号頁・発行日

vol.11, pp.57-71, 1995-01-31

著者

Fukao Yoshio Kono Masaru Yamamoto Akihiko Saito Matsuhiko Nawa Kazunari Giesecke Alberto Perales Crisolfo

出版者

東京大学地震研究所

雑誌

東京大学地震研究所彙報 (ISSN:00408972)

巻号頁・発行日

vol.74, no.2, pp.161-266, 2000-03-21

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We collected all the data of gravity measurements carried out over the last 40 years by Institute Geofisico del Peru (IGP). Because of the long time since data collection, some of the information needed for data reduction were lost over the years. This loss made it difficult for us to determine all of the gravity values unambiguously and consistently from the presently available IGP data alone. Accordingly, there was a need for independently determined gravity stations to which the measurements done by IGP may be compared. In order to provide reference gravity values, we utilized Japanese survey data collected between 1980 and 1984, and conducted more surveys in various parts of Peru in the period between 1995 and 1998. These gravity stations number more than 800, and provide three or more reference points for each of the IGP survey routes. Using these references, the gravity values were calculated for the IGP dataset and Bouguer corrections were applied. Finally, a Bouguer anomaly map of Peru was produced based on these data. This paper reports all the procedures involved in the data reduction, discusses the reliability of the reduced data, and points out the main features of the Bouguer anomaly map.

著者

深尾 良夫

出版者

海洋研究開発機構横浜研究所海洋地球情報部

雑誌

Blue earth (ISSN:13460811)

巻号頁・発行日

vol.19, no.6, pp.12-15, 2007-11

著者

深尾 良夫 丸山 茂徳 大林 政行 井上 公

出版者

一般社団法人 日本地質学会

雑誌

地質学雑誌 (ISSN:00167630)

巻号頁・発行日

vol.100, no.1, pp.4-23, 1994-01-15 (Released:2008-04-11)

参考文献数

88

被引用文献数

67 79

著者

深尾 良夫

出版者

一般社団法人 電気学会

雑誌

電気学会誌 (ISSN:13405551)

巻号頁・発行日

vol.115, no.3, pp.155-155, 1995-02-20 (Released:2008-04-17)

著者

梶川 昌三 山田 功夫 深尾 良夫

出版者

公益社団法人 日本地震学会

雑誌

地震 第2輯 (ISSN:00371114)

巻号頁・発行日

vol.46, no.3, pp.229-235, 1993-12-14 (Released:2010-03-11)

参考文献数

5

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One of the largest different conditions between the nature and laboratory experiment of rock fracturing is strain rate. Conventional experiment at a constant strain rate may not simulate the precursory stage of seismic fracture, where strain rate is so low that any anomalous crustal deformation may occur by consuming the strain energy that has already accumulated rather than one newly supplied from the exterior. In order to simulate such a preseismic stage of the crust, we conducted a “zero strain-rate experiment” using Westary granite as a sample. The granite specimen is loaded at a constant strain-rate mode until stress reaches a level about 90% of the fracture stress. The bulk axial strainis then kept constant by servo-control to observe the time-variations of axial stress, local strains, dilatant strain and AE-activity.Initially the axial stress decays exponentially and then linearly until the sample is finally broken. Axial surface strain shows a different behavior at different locality; strain concentration occurs in the area near the final fault and strain relaxation in the area far from it. Very anomalous behaviors are observed in both the areas just prior to the final break. Some implications of these results are discussed in conjunction with the field observations of crustal deformation before earthquake occurrence.

著者

横田 華奈子 勝又 勝郎 山下 幹也 深尾 良夫 小平 秀一 三浦 誠一

出版者

日本海洋学会

雑誌

海の研究 (ISSN:09168362)

巻号頁・発行日

vol.19, no.6, pp.317-326, 2010-11-05

被引用文献数

1

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マルチチャンネル反射法地震探査(Multi-Channel Seismic survey,MCS survey)は,これまで地震学において地下の構造探査に用いられてきた手法である。2003年にこのMCSデータを用いて海洋中の密度構造を可視化できることが指摘されてから,地震音響海洋学(Seismic Oceanography)と呼ばれるMCSデータを用いた海洋物理学が発展してきた。この新しい研究分野を本稿で紹介する。MCSデータとは人工震源から発振された音波の反射強度を記録したものである。ノイズが多いなどの難点はあるが,従来の海洋観測法では様々な制約から取得することが難しい水平・鉛直ともに高解像なデータである(水平分解能6.25〜12.5m,鉛直分解能0.75〜3m)。観測は船舶を停止せずに行われるため,約200kmの測線を前述の分解能で1日で観測できる。MCSデータを用いると広範囲の海洋中のファインスケールの密度構造を可視化することができる。ここでは一例として,伊豆・小笠原海域の1測線に見られた反射強度断面上の低気圧性渦を挙げる。

著者

川原 春幸 竹田 正司 富井 茂三 押鐘 功 友田 亮生 渡辺 清 太田 文正 渡辺 博士

出版者

社団法人 日本補綴歯科学会

雑誌

日本補綴歯科学会雑誌 (ISSN:03895386)

巻号頁・発行日

vol.4, no.2, pp.162-168, 1960-11-10 (Released:2010-08-10)

参考文献数

10

被引用文献数

1 1 3

著者

松澤 暢

出版者

公益社団法人 日本地震学会

雑誌

地震 第2輯 (ISSN:00371114)

巻号頁・発行日

vol.44, no.Supplement, pp.145-158, 1991-07-24 (Released:2010-03-11)

参考文献数

133

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Three-dimensional velocity structure beneath island arcs, especially beneath Japan arc, has been investigated in detail by many studies in the last dacade. The low-velocity zone beneath active volcanoes and the high-velocity slab have been delineated by using the block inversion technique. The location of the upper boundary of the descending slab has been estimated precisely by the use of some kinds of converted or reflected waves; the boundary has been located just above the deep seismic zone. In some regions, an oblique thin low-velocity layer has been found on the descending high-velocity slab.

著者

海野 徳仁 河野 俊夫 岡田 知己 中島 淳一 松澤 暢 内田 直希 長谷川 昭 田村 良明 青木 元

出版者

公益社団法人 日本地震学会

雑誌

地震 第2輯 (ISSN:00371114)

巻号頁・発行日

vol.59, no.4, pp.325-337, 2007-03-25 (Released:2013-08-05)

参考文献数

21

被引用文献数

1 5

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Hypocenters of the main shocks and aftershocks of the 1933 Mjma 7.1, 1936 Mjma 7.4, 1937 Mjma 7.1, 1939 Mjma 6.9, 1978 Mjma 7.4, and 1981 Mjma 7.0 Miyagi-oki, NE Japan, earthquakes are relocated by using S-P times reported in the Seismological Bulletin of the Japan Meteorological Agency (JMA) and those re-read from original smoked-paper seismograms observed at Mizusawa station of National Astronomical Observatory of Japan (NAOJ) and at Mukaiyama station of Tohoku University. In order to avoid large errors caused by inaccuracies in the arrival times of P- and S-waves and the limited number of observation stations, we determined hypocenters by using a grid search method based on the assumption that these events occurred at the boundary between the subducting Pacific plate and the overriding plate. The main shock epicenters of the 1933, 1936, 1937, and 1978 earthquakes are determined close to each other, and distributions of their aftershocks show that aftershock areas of 1933, 1936, and 1937 events partly overlap with that of the 1978 event and occupy its easternmost, central, and westernmost portions, respectively. It is likely that the 1933, 1936, and 1937 events possibly ruptured a part of the source area of the 1978 event, that is the eastern, central, and western portions, respectively. Locations of the main shock and aftershock area of the 1939 event are adjacent to the eastern edge of the source area of 1978 event. After the 1978 event, the 1981 earthquake had occurred there following the slip on the asperities in the presumed Miyagi-oki earthquake source area.

著者

有吉 慶介 松澤 暢 矢部 康男 長谷川 昭 加藤 尚之

出版者

公益社団法人 日本地震学会

雑誌

地震 第2輯 (ISSN:00371114)

巻号頁・発行日

vol.59, no.4, pp.309-324, 2007-03-25 (Released:2013-08-05)

参考文献数

48

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A two-dimensional (2D) numerical simulation of seismic cycles on the plate boundary in a subduction zone is performed based on a rate- and state-dependent friction law to obtain insight into complicated cycle of interplate earthquakes off Miyagi Prefecture and to investigate possible precursory sliding behavior. Assuming that the complexity of seismic cycle such as the off Miyagi Prefecture Earthquake is mainly due to the heterogeneity of frictional properties, we divide the plate boundary into five segments along dip direction: three frictionally stable segments and two (shallower and deeper) seismogenic segments are placed alternately. From many trial simulation results, we find that the frictional parameters (b-a)and dc in the deeper seismogenic segment should be smaller than those in the shallower segment in order to generate earthquakes in the deeper segment more frequently than in the shallower segment. The simulation results show that preseismic, coseismic, and postseismic slip in a seismogenic segment tends to become larger when it occurs just after the earthquake in the other seismogenic segment, because the previous earthquake in the other seismogenic segment keeps on forward slip through the intermediate aseismic segment. We also find that the stress rate in the down-dip direction in the vicinity of the lower edge of the deeper seismogenic segment is compressional for the period of about one year prior to the occurrence of the earthquake in the segment while it is tensional prior to the event in the shallower segment. This result suggests that seismic activity change in a slab can be a clue to the intermediate-term prediction of large interplate earthquakes.

著者

松澤 暢

出版者

公益社団法人 日本地震学会

雑誌

地震 第2輯 (ISSN:00371114)

巻号頁・発行日

vol.42, no.4, pp.525-536, 1989-12-24 (Released:2010-03-11)

参考文献数

68

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Many later phases such as ScSp, PS, SP and SS converted or reflected at the upper boundary of a descending oceanic plate are frequently observed in a subduction zone. The location of the upper boundary has been estimated to be just above the deep seismic zone by the use of these phases. Moreover, from the analyses of the later phases such as PS and channel waves, it has been found that a low velocity layer exists on the surface of the plate. The most probable interpretation of the low velocity layer, at least in the shallow depths, is the descending oceanic crust.

著者

山下 哲央 岡田 知己 松澤 暢 長谷川 昭

出版者

公益社団法人 日本地震学会

雑誌

地震 第2輯 (ISSN:00371114)

巻号頁・発行日

vol.56, no.4, pp.457-469, 2004-03-25 (Released:2010-03-11)

参考文献数

38

被引用文献数

2

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We estimated the scaling relation, i. e. MO (seismic moment)-fC (corner frequency) relation, of small to moderate-sized earthquakes east off northeastern Japan. We used spectral ratio method to accurately estimate fC from observed spectra of earthquakes. We calculated spectral ratios of all the event pairs with spatial separations less than the hypocenter location errors, and estimated fC values by fitting them with theoretical spectral ratios. Seismic moments were estimated from the JMA (Japan Meteorological Agency) magnitudes. We also estimated spatial variation of the scaling relation along the plate boundary of the subduction zone. Obtained scaling relation was compared with the scaling law derived by Nadeau and Johnson (1998) in which seismic coupling coefficient was assumed to be 100%. Obtained MO-fC samples are somewhat scattered and the distribution range corresponds to seismic coupling coefficients of 1 to 100%. The range corresponds to stress drops of 0.1 to 10MPa. Regional variations of stress drops are also observed. In particular, lower stress drops are estimated in and around the fault area of the 1896 Sanriku tsunami earthquake. Higher stress drops are obtained for the deeper portion (deep thrust zone) of the plate boundary. This tendency of higher stress drops for deeper events can be explained by the difference in physical properties (i. e., rigidity) which depend on depth. The MO-fC relation also varies along the arc. Areas with higher stress drops are distributed in and around the asperities of some large earthquakes. These events with higher stress drops might occur off the plate boundary and/or on the plate boundary in and around the asperities.