著者

神田 克久 武村 雅之 宇佐 美龍夫

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.57, no.2, pp.153-170, 2004-12-27 (Released:2010-03-11)

参考文献数

36

被引用文献数

4

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An inversion analysis has been developed to evaluate short-period seismic wave radiation zones on an earthquake fault plane using seismic intensity data. It is a useful method for historical earthquakes, for which neither strong motion nor tsunami data have been observed by instruments. Since the accuracy of the present method is verified by using ground motion waveforms synthesized by the stochastic Green's function method, it is concluded that the effects of directivity of the fault rupture process and the radiation pattern on seismic intensity distribution can be neglected in the frequency range that is effective for seismic intensity. The present method is applied to great earthquakes that have occurred since 300 years ago in the Nankai Trough seismogenic zone in southwestern Japan, where the Philippine Sea plate is subducting beneath the Eurasian plate. The reliability of their solutions is discussed based on a sensitivity analysis. It is noted that short-period seismic wave radiation zones are often adjacent to large slip areas, termed asperities, but don't always overlap them. Furthermore, they are sometimes located where fault rupture has stopped. Short-period seismic waves are not always radiated from the same zone. For example, fault zones in the Enshu-Nada Sea, the Kumano-Nada Sea, the Kii Channel and the Kochi seacoast have radiated short-period seismic waves at every event, but whether or not short-period seismic waves were radiated in the interior of Suruga Bay, off the Shiono Cape and off the Muroto Cape varied with the events. It is also concluded that crustal structures such as subducted seamounts and subducted ridges take an important role of radiation of short-period seismic waves.

著者

武村 雅之 小山 順二

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.36, no.3, pp.323-336, 1983-09-25 (Released:2010-03-11)

参考文献数

37

被引用文献数

1

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Classification of low-frequency earthquakes has been made quantitatively by using a diagram of seismic-moment factor Me versus characteristic period Tc. Tc and Me correspond to period of corner frequency and seismic-moment density at Tc of each earthquake. About 3, 000 earthquakes from 1926 to 1978 along the Kurile, Japan, and Ryukyu trenches have been analyzed and MS's of those earthquakes cover the range from 3 to 8.3. Most of earthquakes beneath the inner trench slopes have been classified into low-frequency events which show large Tc for the same Me, while ordinary earthquakes have been commonly found in the frontal arc regions. Relations among magnitudes and seismic moment: MS-MJMA, MS-mb, and MS-Mo, for low-frequency events are also different from those for ordinary events. The relations, therefore, cannot be explained by a scaling model for ordinary earthquakes. A scaling model has been derived for low-frequency earthquakes in a statistical manner, taking into account constraints based on the relations among magnitudes and seismic-moment mentioned above. Corner frequencies of source spectra of the low-frequency model are always one half of those of the ordinary model with the same seismic-moment. This model has been also justified by the data of so called tsunami earthquakes in other subduction regions in the world, suggesting a similarity relation among destructive tsunami earthquakes and low-frequency earthquakes with small magnitude.

著者

武村 雅之 池浦 友則 野澤 貴

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.52, no.4, pp.425-444, 2000-03-25 (Released:2010-03-11)

参考文献数

55

被引用文献数

1

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Magnitudes for the 1923 Kanto earthquake and its major aftershocks were determined in JMA (Japan Meteorological Agency) scale. The original definition of the JMA magnitude is a magnitude that is calculated by the Tsuboi's formula from the maximum amplitudes in horizontal components of seismograms obtained by the regional observation network of JMA. The used seismograms were recorded by standard seismographs, which were the displacement type with the natural period of about 5s and damping ratio of about 8. However, the seismometers had not been yet standardized before 1925 and various types had been used whose instrumental responses were quite different from those of the standard seismographs. The purpose of the present study was that the JMA magnitudes of the 1923 Kanto earthquake and its major 3 aftershocks were determined in consideration of the difference of the instrumental responses. Fortunately, unsaturated seismograms by the Imamura's type strong motion seismographs (displacement type) have been preserved at 7 stations of JMA. The natural period and damping ratio of each seismograph have been evaluated from the free oscillation records preserved at each station. The records for the main shock and aftershocks were digitized and corrected in the instrumental responses to calculate the seismograms with the instrumental response of the standard seismograph of JMA. After that, the maximum amplitudes were measured on the corrected records and the magnitude was determined for each earthquake following the definition of the JMA magnitude. The determined JMA magnitude was 8.1±0.2 for the main shock. All the results were consistent within the difference of 0.2 with the customary results, which were determined from the uncorrected amplitude and seismic intensity data. The standard deviations were smaller than 0.2 for all the events, which shows higher reliability of the present results, comparing with the past ones.

著者

神田 克久 武村 雅之

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.58, no.3, pp.177-198, 2005-12-25 (Released:2010-03-11)

参考文献数

41

被引用文献数

2

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The inversion analysis using seismic intensity data is carried out to investigate the source characteristics of major damage earthquakes that have occurred in the sea off Miyagi Prefecture since 1861. It can evaluate short-period seismic wave radiation zones (SPRZ) on an earthquake fault plane. Comparison of the result of the inversion analysis for the May 26, 2003 Off-Miyagi earthquake with the source region deduced from reported aftershock activity verified sufficient accuracy of the present method. We compared the location of SPRZ among analyzed earthquakes and identified the kinds of earthquakes. The SPRZ of the June 12, 1978 earthquake was located near the seacoast of Miyagi Prefecture, adjacent to the large slip area obtained from the waveform inversion by Yamanaka and Kikuchi (2004). The SPRZ of the November 3, 1936 and July 27, 1937 earthquakes were located on the south of that of the 1978 earthquake, which may indicate that the rupture area of the 1936 and 1937 earthquakes were different from that of the 1978 earthquake. On the contrary, location of the SPRZ of the February 20, 1897 earthquake was similar to that of the 1978 earthquake. The SPRZ of the August 5, 1897 earthquake was located near the Japan Trench, while that of the April 23, 1898 earthquake was just beneath the coast of northern Miyagi Prefecture, suggesting that it was an intermediate-depth intraslab earthquake the same as the May 26, 2003 event. The location of the SPRZ of the 21 October, 1861 earthquake was mostly consistent with that of the 1978 earthquake. We consider that the 1861 earthquake should have occurred on the upper boundary of the subducting Pacific plate, not in the inland of northern Miyagi Prefecture.

著者

時実 象一

出版者

国立研究開発法人 科学技術振興機構

雑誌

情報管理 (ISSN:00217298)

巻号頁・発行日

vol.56, no.12, pp.822-832, 2014-03-01 (Released:2014-03-01)

参考文献数

14

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わが国の主要な電子ジャーナル・プラットフォーム,J-STAGE,NII-ELS,メディカルオンラインにおける科学技術分野の学術雑誌の登載数を2005,2008,2013年の3回にわたり調査した。2013年2月における全雑誌中の電子ジャーナルの比率は,和文・混載誌38.7%,英文誌89.3%,全体では44.5%であった。全プラットフォームの,2005年から2013年の間の電子ジャーナル増加率は,和文・混載誌が83.9%,英文誌が29.2%,全体では73.6%であった。また,プラットフォームごとの比較では,J-STAGEの増加が顕著であった。英文電子ジャーナル334誌については,49.7%(166誌)が海外出版社からのみ提供されている。海外出版社のシェア,および各雑誌の出版社の推移についても調査した。JST(JSTPlusおよびJMEDPlus),NII-CJP,医学中央雑誌,JAPICの各文献データベースの2011年収録雑誌数の重複を調べたところ,JSTのみに収録されている雑誌数(567誌)は,NII-CJPのみの収録誌(226誌),医学中央雑誌のみの収録誌(174誌)と比較して多かった。データベース間の重複では,JSTと医学中央雑誌の重複が多いことがわかった。

著者

羽鳥 徳太郎

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.52, no.1, pp.43-50, 1999-06-30 (Released:2010-03-11)

参考文献数

19

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The Noto Peninsula coast has been suffered from the tsunamis originated along the eastern margin of the Japan Sea. According to the old documents, the 1833 Yamagata-Oki tsunami reached 5.3m at Wajima (tip of Noto Peninsula), and killed 47 persons. Inundation heights of the 1964 Niigata, 1983 Nihonkai-Chubu and 1993 SW. Hokkaido tsunamis were 2-4m at Wajima and its neighboring area. These tsunami heights are more than 2-3.5 times larger than the ones expected from the average tsunami magnitude. Based on the refraction diagrams and the shoaling-refraction factors around the peninsula, amplification factors estimated by the Green's formula are 3.0-4.0 at the north coast, 1.5 at the west coast and 1.0 at the east coast. The distribution patterns of the calculated factors nearly agree with those of the inundation heights for each tsunami. In case of the 1964 Niigata tsunami having the period of about 20min, the seishe of Nanao Bay (east side of peninsula) may be excited, because the maximum wave occurred 2.7 hour late from the initial wave. Tsunamis generated off Yamagata and SW. Niigata are strongly affected by the shoaling-refraction.

著者

羽鳥 徳太郎

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.48, no.2, pp.229-233, 1995-08-25 (Released:2010-03-11)

参考文献数

22

被引用文献数

1

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Ten years after the 1983 Nihonkai-Chubu tsunami, the 1993 Hokkaido Nansei-Oki tsunami (magnitude, m=3) hit Okushiri Is., Oshima Peninsula and other regions, Killing 231 people by tsunami and landslide. The distribution pattern of tsunami hfeights is different from that of the 1741 Oshima-Oki tsunami (m=3.5). This paper presents the distribution of cumulative energy, ∑H2, for each 150km segment alomg the Japan Sea coast for the time intervals of the recent 100-year (1894-1994) and of 1600 to 1893 (historical tsunamis). The amount of cumulative energy for the recent and historical tsunamis is largest at the Akita and Oshima-Tsugaru regions, respectively. The cumulative energy at the Akita, Shakotan and other regions for the recent 100-year tsunamis exceeds that of the historical tsunamis. On the contrary, the cumulative energy in the Oshima-Tsugaru and Niigata-Ishikawa regions for the recent tsunamis are small compared with those of the historical tsunamis. Precaution must be paid to these regions for seismic gap may exist there. The total tsunamigenic energy in the Japan Sea comprises 24% of that due to tsunamis in the whole Japan.

著者

Ippei Torii Kaoruko Ohtani Takahito Niwa Naohiro Ishii

出版者

Information and Media Technologies 編集運営会議

雑誌

Information and Media Technologies (ISSN:18810896)

巻号頁・発行日

vol.7, no.3, pp.1173-1179, 2012 (Released:2012-09-15)

参考文献数

13

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This paper attempts to activate a large scale shopping district (shotengai) using new internet techniques. Recently decline of shotengai is a serious problem by development of large shopping centers. We made a new approach with internet techniques to activate shotengai, which is a typical Japanese shopping district. The Osu Shotengai is one of the most famous shotengai in Nagoya, Japan, which includes about 400 stores. We developed Osu shotengai official web site, called “At Osu.” First, the information of 400 stores in Osu shotengai, which includes 9 streets, was collected. Then we created an interactive “Information Visualization System” to put fresh information of shotengai on the web site in real time. It includes “Comment Upload System, ” where store owners can upload their comments and informing news directly on the web site. Further, we developed a new approach to stimulate store owners motivations for participating in the web site. And we also mention about an attractive and interactive web design using twitters to get opinions of users. By developing the new web site, the number of visitors of “At Osu” has increased rapidly. Many articles about this new approach to activate shotengai with a web site were published in newspapers or magazines and we have receives many inquiries.

著者

新倉 和文

出版者

JAPANESE ASSOCIATION OF INDIAN AND BUDDHIST STUDIES

雑誌

印度學佛教學研究 (ISSN:00194344)

巻号頁・発行日

vol.36, no.2, pp.658-661, 1988-03-25 (Released:2010-03-09)

著者

松本 康

出版者

日本社会学会

雑誌

社会学評論 (ISSN:00215414)

巻号頁・発行日

vol.56, no.1, pp.147-164, 2005-06-30 (Released:2009-10-19)

参考文献数

17

被引用文献数

5 4

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Fischerの「下位文化理論」が都市における友人関係の興隆を予測して以来, 日本では都市度と友人関係に関する多くの調査研究がなされてきたが, その結果はまちまちであった.本稿では, 2000年に実施された名古屋都市圏調査のデータを用いて, 都市度と友人関係に関する経験的・理論的争点を検討する.分析の結果, 「友人興隆」仮説に反して, 友人数は都市度が増すにつれて減少していた.それは主に地元都市圏出身者が, 都市的地域で地元仲間集団を衰退させていたからである.しかし, 彼らの中距離友人数は, 都市度が増すにつれて増加していた.また, 遠距離友人数は, 都市度とは無関係で, 回答者の移動履歴の影響をうけていた.多くの経験的関連が移動履歴によって条件づけられていたという事実は, 社会的ネットワークの「選択-制約」モデルよりも「構造化」モデルを支持するものである.後者は, 諸個人の移動履歴によって関係資源の地理的分布が異なり, 都市圏内部に関係資源を豊富にもつ場合にのみ, 友人関係の再生産は都市度に影響されると強調する.さらにマクロにみると, 都市化の初期段階では, 移住者が多いために, 都市圏内部の社会的ネットワークは希薄であったかもしれないが, 一世代後には, 地元都市圏出身者の増大によって, 中距離友人ネットワークが増大すると推測される.こうして本研究は, アーバニズム理論に時間的・空間的視点を提供するものである.

著者

中山 伸一 西村 多久磨 村上 達也 櫻井 茂男

出版者

日本パーソナリティ心理学会

雑誌

パーソナリティ研究 (ISSN:13488406)

巻号頁・発行日

vol.24, no.3, pp.218-221, 2016-03-10 (Released:2016-03-21)

参考文献数

17

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This study examined the relationship between cognitive strategies in pessimists compared to optimists and attention bias by using a gap-overlap task with achievement-related words. The 32 college student participants were divided into two groups: pessimists (n=15) and optimists (n=17). Results of a 2 (pessimists, optimists) ×3 (negative, neutral, positive) mixed ANOVA revealed a significant interaction between groups and stimuli types, and a simple main effect of increased reaction times to positive words for optimists. These findings suggest that optimists have difficulty disengaging from positive achievement-related words.

著者

上田 孝行 福本 潤也

出版者

Japan Society of Civil Engineers

雑誌

土木学会論文集 (ISSN:02897806)

巻号頁・発行日

vol.2001, no.688, pp.49-62, 2001-10-20 (Released:2010-08-24)

参考文献数

45

被引用文献数

3

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本稿では, 行動モデル研究に関して筆者らが持っている問題意識を,『観測と被観測の関係』に着目しながら話題提供することを意図している. 取り上げる話題は次の三点である. 第一に, 既往の代表的なモデル作成方法を, 観測と被観測の関係を捉える一つの有力なアプローチである逆問題の考え方に依拠して整理する. 第二に, 観測のための統計情報の利用可能性が広がった場合に, モデルを用いた影響予測や政策評価の信頼性・妥当性の向上を通じて生じる情報価値を, 社会的厚生のタームで把握する問題について議論する. 第三に, 被観測の立場にある主体の選好を行動モデルを通して把握し, それに基づいて政策評価を行う場合に生じうる論理的・倫理的問題について議論する.

著者

飛田 範夫

出版者

公益社団法人 日本造園学会

雑誌

ランドスケープ研究 (ISSN:13408984)

巻号頁・発行日

vol.61, no.5, pp.385-388, 1997-03-30 (Released:2011-07-19)

参考文献数

17

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平安時代前期に前庭に畝をつくり, キクを植えている例が見られるが, 土を盛って壇を築いて排水をよくして植物を育成させようとしたことが, 花壇を生みだしたように思われる。庭園施設として花壇を観賞に耐えるものにすることは, 二義的に重要なことであった。花壇という言葉は10世紀中頃の中国の詩にあり, 日本では『看聞御記』の応永25年 (1418) 2月28日の条に「東庭築花壇栽草花」とあるのが初見である。最も古い花壇遺構は, 朝倉館跡で室町時代のものが検出されている。江戸時代の花壇としては, 流行の植物専用, 回遊式庭園では重要な施設, 植木屋ではキクの栽培場所民家では草花を植える所, 寺院では草花・樹木の苗畑としての事例がみられる。

著者

湯上 伸弘

出版者

特定非営利活動法人 グローバルビジネスリサーチセンター

雑誌

赤門マネジメント・レビュー (ISSN:13485504)

巻号頁・発行日

vol.13, no.1, pp.37-52, 2014-01-25 (Released:2015-01-25)

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本報告では、ビッグデータ活用の現状と今後について、ビッグデータの概要、活用事例、ビッグデータ利活用に向けた富士通研究所の取り組み・技術を紹介することで考察する。大きなデータを使うというのは本質ではなく手段であり、ビッグデータ分析は、単純にデータを分析するというだけではなく、それをどう使うかというところと密接に結びついている。実際のビジネスの意思決定の中でどのように使っていくかを明確にし、企業が持っているデータだけではなく、外にあるデータをどう使っていくかを考えていくことが重要である。

著者

阪本 清美 浅原 重夫 坂下 誠司 山下 久仁子 岡田 明

出版者

一般社団法人 日本人間工学会

雑誌

日本人間工学会大会講演集 日本人間工学会第53回大会

巻号頁・発行日

pp.368-369, 2012 (Released:2012-10-27)

著者

栗原 さえ子 中野 博民 難波江 章

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌D(産業応用部門誌) (ISSN:09136339)

巻号頁・発行日

vol.114, no.11, pp.1179-1180, 1994-10-20 (Released:2008-12-19)

参考文献数

2

出版者

JAPANISCHE GESELLSCHAFT FUER GERMANISTIK

雑誌

ドイツ文学 (ISSN:03872831)

巻号頁・発行日

vol.95, pp.285b-285b, (Released:2009-01-30)

著者

長瀧 重信

出版者

日本保健物理学会

雑誌

保健物理 (ISSN:03676110)

巻号頁・発行日

vol.47, no.4, pp.233-234, 2012 (Released:2013-12-17)

被引用文献数

1

出版者

一般社団法人 日本内科学会

雑誌

日本内科学会雑誌 (ISSN:00215384)

巻号頁・発行日

vol.104, no.4, pp.News4-News4, 2015-04-10 (Released:2016-04-10)

著者

高崎 智彦

出版者

獣医疫学会

雑誌

獣医疫学雑誌 (ISSN:13432583)

巻号頁・発行日

vol.19, no.1, pp.1-3, 2015-07-20 (Released:2016-01-04)

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Dengue fever is a mosquito-borne viral disease. Dengue virus (DENV) infections occur in most of the tropical and subtropical areas of the world. DENV infection with any of four serotypes leads to a broad spectrum of clinical symptoms and their severity, including asymptomatic infection, dengue fever (DF) and fatal dengue hemorrhagic fever (DHF). DF/DHF is considered to be one of the most important re-emerging infectious diseases. Physicians and pediatricians in non-endemic countries are often unfamiliar with the symptoms and unaware of the potential importation of patients with DF/DHF. In August of 1942, an epidemic occurred suddenly in Nagasaki city and then in Sasebo city, Osaka and Kobe city. The epidemic in 1942 was subsided in November, but in the next summer it broke out again and recurred every summer until 1945. There were no dengue endemics in Japan since then.In late August of 2014, three autochthonous dengue cases were reported in Japan. Since then, as of 31 December 2014, a total of 162 autochthonous cases have been confirmed. While cases were reported from throughout Japan, the majority was linked to visiting a large park or its vicinity in Tokyo, and the serotype detected has been serotype 1.