著者

中村 洋介 金 幸隆

出版者

The Association of Japanese Geographers

雑誌

地理学評論 (ISSN:13479555)

巻号頁・発行日

vol.77, no.1, pp.40-52, 2004-01-01 (Released:2008-12-25)

参考文献数

24

被引用文献数

2 2

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本研究では,魚津断層の南部に位置する早月川および上市川流域の河成段丘においてボーリング調査を実施し,ローム層中に微量に含まれる火山起源の鉱物を用いて段丘の形成時期の推定を行った.研究地域の段丘面は,高位より,東福寺野面,中野面および大崎野面の3面に分類される.ローム層の層相ならびに火山灰層の層位から考慮して,東福寺野面はMIS6に,中野面はMIS5dに,大崎野面はDKP降下直前に,それぞれ形成されたものと推定される.これらの段丘面は魚津断層によって上下変位を受けている.それぞれの段丘面の形成年代から,魚津断層の上下平均変位速度は北部では0.4~0.5mm/yr程度,南部では0.2mm/yr程度と算出される.北部の変位速度が南部よりも速いのは,本研究地域が全長約25kmの魚津断層の南端に位置するためと考えられる.

著者

都司 嘉宣 佐竹 健治 石辺 岳男 楠本 聡 原田 智也 西山 昭仁 金 幸隆 上野 俊洋 室谷 智子 大木 聖子 杉本 めぐみ 泊 次郎 Heidarzadeh Mohammad 綿田 辰吾 今井 健太郎 Choi Byung Ho Yoon Sung Bum Bae Jae Seok Kim Kyeong Ok Kim Hyun Woo

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.86, no.3/4, pp.29-279, 2012-03-16

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We report the results of field surveys conducted by the Earthquake Research Institute, to measure tsunami heights from the 2011 off the Pacific coast of Tohoku, Japan Earthquake (M 9.0), on March 11. Measurements were taken at 296 points on the Sanriku coasts of Aomori, Iwate, and Miyagi Prefectures, and the Pacific coasts of Ibaraki and Chiba Prefectures. The data are included in the results of the 2011 Tohoku Earthquake Tsunami Joint Survey Group. We did not cover the Sendai plain in the southern Miyagi Prefecture because other parties extensively measure there, nor Fukushima Prefecture because of the accident of the Fukushima Dai-ichi nuclear power plant. The twelve surveys first sought traces indicating tsunami runup or inundation heights. Reliability was classified into A (most reliable based on clear physical evidence and eyewitness accounts), B (mostly based on natural traces), and C (least reliable based on equivocal evidence). Most physical evidence obtained after June was not significant; therefore, reliance was mostly placed on eyewitness accounts. Locations and relative heights above sea level were measured using handheld GPS receivers, auto-level, or total station. The measured heights were corrected for differences in tide level between measurement time and tsunami arrival time. The results are shown on table and four regional maps; however, the details of each measurement, including locations shown on 1:25,000 maps and photographs of evidence are shown in the Appendix. Along the northern Sanriku coast (Aomori and Iwate), most of the 141 heights range between 10m and 30m. Runup heights exceeding 30m were measured at one location in Noda Village and nine locations in Miyako City. On the southern Sanriku coast in Miyagi, most of the 76 measurements range between 4 and 20 m. On the Ibaraki coast, 36 measurements range from 2.8 to 8.1 m, and the heights generally decease toward the south. On the Chiba coast, 43 measurements range from 0.7 to 7.9 m, with the maximum height near Iioka, Asahi City.

著者

金 幸隆

出版者

公益社団法人 日本地理学会

雑誌

地理学評論 Series A (ISSN:18834388)

巻号頁・発行日

vol.93, no.6, pp.464-466, 2020-11-01 (Released:2023-02-19)

著者

鈴木 康弘 岡田 篤正 竹村 恵二 慶 在福 金 幸隆 廣内 大助 伊藤 愛 大石 超 中村 洋介 成瀬 敏郎 北川 浩之 渡辺 満久

出版者

日本活断層学会

雑誌

活断層研究 (ISSN:09181024)

巻号頁・発行日

vol.2005, no.25, pp.147-152, 2005

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The Ulsan fault extends for 50 km along the NNW-SSE direction in the southeastern part of the Korean Peninsula; this is one of the most important active faults in Korea. Its paleoseismicity has recently attracted considerable attention. With the support of KOSEF (Korean Science and Engineering Foundation), excavation studies of this fault were conducted in 1999 as a part of the Korea-Japan cooperative research at Kalgok-ri in Kyongju city. The results obtained are summarized as follows. (1) The Ulsan fault plane has an eastward dip of approximately 30 degrees and exhibits typical reverse faulting. (2) It was reactivated three times in the past 30,000 years, in particular, twice after the age of AT tephra (approximately 25,000 years BP). (3) A vertical displacement of approximately 0.8 m occurred during the fault event, and the amount of net slip along the fault plane is calculated to be 1.6 m.

著者

吾妻 崇 太田 陽子 小林 真弓 金 幸隆

出版者

公益社団法人 日本地理学会

雑誌

地理学評論. Ser. A (ISSN:00167444)

巻号頁・発行日

vol.69, no.5, pp.365-379, 1996-05

参考文献数

12

被引用文献数

1

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The Nojima earthquake fault appeared along the recognized active fault in the northwestern part of Awaji Island in association with the 1995 Hyogoken-Nanbu Earthquake. This earthquake fault is dominated by right-lateral offset (max. 1.7m), with a high-angle reverse fault which has a maximum verlical displacement of 1.3m uplift on the southeastern side. We have repeated the measurement of seven profiles of the fault scarp at two areas (Hirabayashi, Ogura). The fault scarp of the Hirabayashi area (profiles 1-4) is composed of the Plio-Pleistocene Osaka Group at the base and is overlain by an unconsolidated gravel bed at the top. The Ogura area (profiles 5-7) is entirely underlain by the Plio-Pleistocene Osaka Group. The fault scarp in these two areas is characterized by an overhanging slope due to thrusting of the upthrown side. Scarp retreat at Hirabayashi occurred in association with the sudden collapse of the gravel bed and proceeded more quickly than at Ogura, where fault scarp retreat proceeded by exfoliation of the fault plane as well as partial collapse of the Osaka Group. These facts strongly indicate that the lithological control is most significant for the formation of original fault scarp as well as retreat. The retreat of fault scarp was very slow after March to June at Hirabayashi and June to July at Ogura, and proceeded more quickly than some of seismically generated normal faults.

著者

都司 嘉宣 佐竹 健治 石辺 岳男 楠本 聡 原田 智也 西山 昭仁 金 幸隆 上野 俊洋 室谷 智子 大木 聖子 杉本 めぐみ 泊 次郎 Heidarzadeh Mohammad 綿田 辰吾 今井 健太郎 Choi Byung Ho Yoon Sung Bum Bae Jae Seok Kim Kyeong Ok Kim Hyun Woo

出版者

東京大学地震研究所

雑誌

東京大學地震研究所彙報 = Bulletin of the Earthquake Research Institute, University of Tokyo (ISSN:00408972)

巻号頁・発行日

vol.86, no.3-4, pp.29-279, 2012-03-16

---

We report the results of field surveys conducted by the Earthquake Research Institute, to measure tsunami heights from the 2011 off the Pacific coast of Tohoku, Japan Earthquake (M 9.0), on March 11. Measurements were taken at 296 points on the Sanriku coasts of Aomori, Iwate, and Miyagi Prefectures, and the Pacific coasts of Ibaraki and Chiba Prefectures. The data are included in the results of the 2011 Tohoku Earthquake Tsunami Joint Survey Group. We did not cover the Sendai plain in the southern Miyagi Prefecture because other parties extensively measure there, nor Fukushima Prefecture because of the accident of the Fukushima Dai-ichi nuclear power plant. The twelve surveys first sought traces indicating tsunami runup or inundation heights. Reliability was classified into A (most reliable based on clear physical evidence and eyewitness accounts), B (mostly based on natural traces), and C (least reliable based on equivocal evidence). Most physical evidence obtained after June was not significant; therefore, reliance was mostly placed on eyewitness accounts. Locations and relative heights above sea level were measured using handheld GPS receivers, auto-level, or total station. The measured heights were corrected for differences in tide level between measurement time and tsunami arrival time. The results are shown on table and four regional maps; however, the details of each measurement, including locations shown on 1:25,000 maps and photographs of evidence are shown in the Appendix. Along the northern Sanriku coast (Aomori and Iwate), most of the 141 heights range between 10m and 30m. Runup heights exceeding 30m were measured at one location in Noda Village and nine locations in Miyako City. On the southern Sanriku coast in Miyagi, most of the 76 measurements range between 4 and 20 m. On the Ibaraki coast, 36 measurements range from 2.8 to 8.1 m, and the heights generally decease toward the south. On the Chiba coast, 43 measurements range from 0.7 to 7.9 m, with the maximum height near Iioka, Asahi City.