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The Phreatic Eruption of Mt. Ontake Volcano in 2014 Editorial Board (December 2016) Editor-In-Chief Yasuo Ogawa, Tokyo Institute of Technology, Japan
The Phreatic Eruption of Mt. Ontake Volcano in 2014 Editorial Board (December 2016) Editor-in-Chief Yasuo Ogawa, Tokyo Institute of Technology, Japan Vice Editors-in-Chief Masato Furuya, Hokkaido University, Japan Nozomu Nishitani, Nagoya University, Japan Solid Earth Science Space Science Editors Yosuke Aoki Huixin Liu Takeshi Sakanoi Nanan Balan Takuto Maeda Martha K. Savage Stephen Bannister Koji Matsumoto Benoit Taisne Shanaka de Silva Mitsuhiro Nakagawa Hiroshi Takenaka Koji Fukuma Junichi Nakajima Hiroaki Toh Lin-Ni Hau Yasuhiro Nariyuki Yih-Min Wu Hauke Hussmann Azusa Nishizawa Akimasa Yoshikawa Attila Komjathy Keiji Ohtsuki Alexey Kuvshinov Taku Ozawa Advisory Board Benjamin Fong Chao Hiroo Kanamori Toshitaka Tsuda Bernard Chouet Jun'ichiro Kawaguchi Zhongliang Wu Yoshimori Honkura Takafumi Matsui Kiyoshi Yomogida Toshihiko Iyemori Hitoshi Mizutani Journal Scope Earth, Planets and Space (EPS) is the official journal of the Society of Geomagnetism and Earth, Planetary and Space Sciences, The Seismological Society of Japan, The Volcanological Society of Japan, The Geodetic Society of Japan, and The Japanese Society for Planetary Sciences. EPS is a peer-reviewed, open-access journal published under SpringerOpen. It is an international journal covering scientific articles in the entire field of earth and planetary sciences, particularly geomagnetism, aeronomy, space science, seismology, volcanology, geodesy, and planetary science. EPS also welcomes articles in new and interdisciplinary subjects, and technical reports on instrumentation and software. The journal was launched in 1998 and has since published over 2700 articles. All of them are available for free on SpringerLink: http://link.springer.com/journal/40623 More information about the journal, its article collections, and the submission process is available on the journal homepage: http://earth-planets-space.springeropen.com Submit your next research article to Earth, Planets and Space via: https://www.editorialmanager.com/epsp Yours sincerely, Prof. -
Sulfur Isotopic Characteristics of Volcanic Products from the September 2014 Mount Ontake Eruption, Japan
Sulfur isotopic characteristics of volcanic products from the September 2014 Mount Ontake eruption, Japan 著者 Ikehata Kei, Maruoka Teruyuki journal or Earth, planets and space publication title volume 68 number 1 page range 116 year 2016-07 権利 (C) 2016 The Author(s). This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. URL http://hdl.handle.net/2241/00143733 doi: 10.1186/s40623-016-0496-z Creative Commons : 表示 http://creativecommons.org/licenses/by/3.0/deed.ja Ikehata and Maruoka Earth, Planets and Space (2016) 68:116 DOI 10.1186/s40623-016-0496-z LETTER Open Access Sulfur isotopic characteristics of volcanic products from the September 2014 Mount Ontake eruption, Japan Kei Ikehata* and Teruyuki Maruoka Abstract Components and sulfur isotopic compositions of pyroclastic materials from the 2014 Mt. Ontake eruption were inves- tigated. The volcanic ash samples were found to be composed of altered volcanic fragments, alunite, anhydrite, bio- tite, cristobalite, gypsum, ilmenite, kaolin minerals, native sulfur, orthopyroxene, plagioclase, potassium feldspar, pyrite, pyrophyllite, quartz, rutile, and smectite, and most of these minerals were likely derived from the acidic alteration zones of Mt. Ontake. The absence of juvenile material in the eruptive products indicates that the eruption was phre- atic. The sulfur isotopic compositions of the water-leached sulfate, hydrochloric acid-leached sulfate, acetone-leached native sulfur, and pyrite of the samples indicate that these sulfur species were produced by disproportionation of magmatic SO2 in the hydrothermal system at temperatures of 270–281 °C. -
Monitoring Eruption Activity Using Temporal Stress Changes at Mount Ontake Volcano
ARTICLE Received 27 Jul 2015 | Accepted 21 Jan 2016 | Published 19 Feb 2016 DOI: 10.1038/ncomms10797 OPEN Monitoring eruption activity using temporal stress changes at Mount Ontake volcano Toshiko Terakawa1, Aitaro Kato1, Yoshiko Yamanaka1, Yuta Maeda1, Shinichiro Horikawa1, Kenjiro Matsuhiro1 & Takashi Okuda1 Volcanic activity is often accompanied by many small earthquakes. Earthquake focal mechanisms represent the fault orientation and slip direction, which are influenced by the stress field. Focal mechanisms of volcano-tectonic earthquakes provide information on the state of volcanoes via stresses. Here we demonstrate that quantitative evaluation of temporal stress changes beneath Mt. Ontake, Japan, using the misfit angles of focal mechanism solutions to the regional stress field, is effective for eruption monitoring. The moving average of misfit angles indicates that during the precursory period the local stress field beneath Mt. Ontake was deviated from the regional stress field, presumably by stress perturbations caused by the inflation of magmatic/hydrothermal fluids, which was removed immediately after the expulsion of volcanic ejecta. The deviation of the local stress field can be an indicator of increases in volcanic activity. The proposed method may contribute to the mitigation of volcanic hazards. 1 Earthquake and Volcano Research Center, Graduate School of Environmental Studies, Nagoya University, D2-2 (510) Furo-cho Chikusa-ku, Nagoya 464-8601, Japan. Correspondence and requests for materials should be addressed to T.T. (email: [email protected]). NATURE COMMUNICATIONS | 7:10797 | DOI: 10.1038/ncomms10797 | www.nature.com/naturecommunications 1 ARTICLE NATURE COMMUNICATIONS | DOI: 10.1038/ncomms10797 he local stress field around volcanoes represents the reaching a peak on 11 September 2014 before decaying over time superposition of the regional stress field and stress until the eruption, although the seismicity increased again Tperturbations related to volcanic activity1–4. -
6. Research Contributions 6.1 Outline of Research Contributions
6. Research Contributions 6.1 Outline of Research Contributions Published papers are classified as follows: Average umbers of papers for one researcher are as (A) refereed papers, follows; (B) research reviews, (A) 10.43 (previous review 5.68) (C) books, (A1) 4.89 (previous review 2.60) (D) research papers in bulletins and reports, (A2) 3.76 (previous review 2.23) (E) textbooks for lectures, (A3) 1.78 (previous review 0.85) (F) articles in newspapers and magzines, Papers of all categories have increased, in particular, (G) non-refereed papers, papers in (A1) increased by about 30%, considering the (H) data acquisition and collection reports. periods of collections. This indicates that many researchers are conscious of the importance of publishing papers in The refereed papers (A) are subdivided into three refereed journals. 57% of the refreed papers (A) were categories; (A1) complete refereed papers, which are usual written in English. refereed papers published in the scientific or technical In 2001, a book, ‘Handbook of Disaster Prevention journals. (A2) refereed papers, which are refereed papers ‘ was published as a memorial publication of the Disaster read at scientific meetings. (A3) abstract refereed papers, Prevention Research Institute. Besides, lectures to peoples of which abstracts are refereed. The papers in (G) are also were initiated as part of the 21st Century COE (Center Of subdivided into two categories; (G1) papers presented at Excellence) Program. It is quite important to inform the meetings or conferences and (G2) non-refreed papers public of recent research results to popularize knowledge published in academic journals. of disaster mitigation. -
Reconstruction of a Phreatic Eruption on 27 September 2014 at Ontake
Maeno et al. Earth, Planets and Space (2016) 68:82 DOI 10.1186/s40623-016-0449-6 FULL PAPER Open Access Reconstruction of a phreatic eruption on 27 September 2014 at Ontake volcano, central Japan, based on proximal pyroclastic density current and fallout deposits Fukashi Maeno1*, Setsuya Nakada1, Teruki Oikawa2, Mitsuhiro Yoshimoto3, Jiro Komori4, Yoshihiro Ishizuka2, Yoshihiro Takeshita5, Taketo Shimano6, Takayuki Kaneko1 and Masashi Nagai7 Abstract The phreatic eruption at Ontake volcano on 27 September 2014, which caused the worst volcanic disaster in the past half-century in Japan, was reconstructed based on observations of the proximal pyroclastic density current (PDC) and fallout deposits. Witness observations were also used to clarify the eruption process. The deposits are divided into three major depositional units (Units A, B, and C) which are characterized by massive, extremely poorly sorted, and multimodal grain-size distribution with 30–50 wt% of fine ash (silt–clay component). The depositional condition was initially dry but eventually changed to wet. Unit A originated from gravity-driven turbulent PDCs in the relatively dry, vent-opening phase. Unit B was then produced mainly by fallout from a vigorous moist plume during vent develop- ment. Unit C was derived from wet ash fall in the declining stage. Ballistic ejecta continuously occurred during vent opening and development. As observed in the finest population of the grain-size distribution, aggregate particles were formed throughout the eruption, and the effect of water in the plume on the aggregation increased with time and distance. Based on the deposit thickness, duration, and grain-size data, and by applying a scaling analysis using a depth-averaged model of turbulent gravity currents, the particle concentration and initial flow speed of the PDC 4 3 at the summit area were estimated as 2 10− –2 10− and 24–28 m/s, respectively. -
Report by the Japan Federation of Bar Associations on The
JFBA/8/15 March 19, 2015 Japan Federation of Bar Associations Report by the Japan Federation of Bar Associations on the “Seventh and eighth periodic reports of States parties due in 2014, Japan” Proposed questions and their background information that should be included in the List of Issues to be Prepared by the Pre-Sessional Working Group March 19, 2015 Japan Federation of Bar Associations <Table of Contents> Chapter1 General Remarks (summary of past and present discrimination against women) .................................................................................................................................. 3 Section 1 Situation since the Ratification of the Convention on the Elimination of All Forms of Discrimination against Women ............................................................................... 3 Section 2 Overview of the Policies under the Abe Government established in 2012 ....... 4 Section 3 General Problems of the “Women’s Active Participation” ................................ 4 Section 4 Specific Issues on Matters Included in the General Remarks ........................... 6 Chapter2 Individual Articles and Other Matters ................................................................. 7 Article 1 Definition of Discrimination against Women ............................................................. 7 Section 1 Definition of Discrimination against Women .................................................... 7 Article2 Legislative and Other Measures for Policies to Eliminate Discrimination ................. -
Country Report Japan July 2015
_________________________________________________________________________________________________________________________________________________________ Country Report Japan Generated on July 29th 2015 Economist Intelligence Unit 20 Cabot Square London E14 4QW United Kingdom _________________________________________________________________________________________________________________________________________________________ The Economist Intelligence Unit The Economist Intelligence Unit is a specialist publisher serving companies establishing and managing operations across national borders. For 60 years it has been a source of information on business developments, economic and political trends, government regulations and corporate practice worldwide. The Economist Intelligence Unit delivers its information in four ways: through its digital portfolio, where the latest analysis is updated daily; through printed subscription products ranging from newsletters to annual reference works; through research reports; and by organising seminars and presentations. The firm is a member of The Economist Group. London New York Economist Intelligence Unit Economist Intelligence Unit 20 Cabot Square The Economist Group London 750 Third Avenue E14 4QW 5th Floor United Kingdom New York, NY 10017, US Tel: (44.20) 7576 8000 Tel: (1.212) 554 0600 Fax: (44.20) 7576 8500 Fax: (1.212) 586 0248 E-mail: [email protected] E-mail: [email protected] Hong Kong Geneva Economist Intelligence Unit Economist Intelligence Unit 60/F, Central Plaza Rue de l’Athénée 32 18 Harbour Road 1206 Geneva Wanchai Switzerland Hong Kong Tel: (852) 2585 3888 Tel: (41) 22 566 2470 Fax: (852) 2802 7638 Fax: (41) 22 346 93 47 E-mail: [email protected] E-mail: [email protected] This report can be accessed electronically as soon as it is published by visiting store.eiu.com or by contacting a local sales representative. The whole report may be viewed in PDF format, or can be navigated section-by-section by using the HTML links. -
Seventh and Eighth Periodic Reports of States Parties Due in 2014, Japan”
Proposed questions by the Japan Federation of Bar Associations that should be included in the List of Issues on the “Seventh and eighth periodic reports of States parties due in 2014, Japan” Article 1 Definition of Discrimination against Women Section 1 Definition of Discrimination against Women (See page 7 of the Report by the Japan Federation of Bar Associations, INT_CEDAW_NGO_JPN_20500_E, hereinafter referred to as “See page X”) Please report on what concrete steps were taken to address the Committee’s request in the previous Concluding Observation, “to take urgent steps to incorporate the Convention and the definition of discrimination against women, as contained in article 1 of the Convention, fully into domestic legislation and to report on progress made in this regard in its next periodic report.1” Article2 Legislative and Other Measures for Policies to Eliminate Discrimination Section 1 The Status of the Convention (See page 9) A1. Please indicate the Japanese government’s position whether it supports the view that treaties concluded by Japan have the effect of domestic law with legally binding force, and that the substantive provisions of the Convention that are self-executing can be applied by the courts. If the government supports these views, please identify the articles it considers are self-executin A2. Please provide information on whether there are any Supreme Court judgments that recognize application of the Convention itself. Please indicate when and by what process the government plans to realize the individual communication system including the Optional Protocol of this Convention. Also, please identify concrete obstacles to and unsolved issues to be discussed on the inability in realizing the individual communication system in spite of repeated recommendations from the UN treaty bodies including the UN Committee on the Elimination of Discrimination against Women (hereinafter, the Committee), as well as when and how the problems can be solved. -
List of Volcanoes in Japan
Elevation Elevation Sl. No Name Prefecture Coordinates Last eruption Meter Feet 1 Mount Meakan Hokkaidō 1499 4916 43.38°N 144.02°E 2008 2 Mount Asahi (Daisetsuzan) Hokkaidō 2290 7513 43.661°N 142.858°E 1739 3 Lake Kuttara Hokkaidō 581 1906 42.489°N 141.163°E - 4 Lake Mashū Hokkaidō 855 2805 43.570°N 144.565°E - 5 Nigorigawa Hokkaidō 356 1168 42.12°N 140.45°E Pleistocene 6 Nipesotsu-Maruyama Volcanic Group Hokkaidō 2013 6604 43.453°N 143.036°E 1899 7 Niseko Hokkaidō 1154 3786 42.88°N 140.63°E 4050 BC 8 Oshima Hokkaidō 737 2418 41.50°N 139.37°E 1790 9 Mount Rausu Hokkaidō 1660 5446 44.073°N 145.126°E 1880 10 Mount Rishiri Hokkaidō 1721 5646 45.18°N 141.25°E 5830 BC 11 Shikaribetsu Volcanic Group Hokkaidō 1430 4692 43.312°N 143.096°E Holocene 12 Lake Shikotsu Hokkaidō 1320 4331 42.70°N 141.33°E holocene 13 Mount Shiretoko Hokkaidō 1254 4114 44°14′09″N 145°16′26″E 200000 BC 14 Mount Iō (Shiretoko) Hokkaidō 1563 5128 44.131°N 145.165°E 1936 15 Shiribetsu Hokkaidō 1107 3632 42.767°N 140.916°E Holocene 16 Shōwa-shinzan Hokkaidō 731 2400 42.5°N 140.8°E 1945 17 Mount Yōtei Hokkaidō 1898 6227 42.5°N 140.8°E 1050 BC 18 Abu (volcano) Honshū 571 - 34.50°N 131.60°E - 19 Mount Adatara Honshū 1718 5635 37.62°N 140.28°E 1990 20 Mount Akagi Honshū 1828 5997 36.53°N 139.18°E - 21 Akita-Komaga-Take Honshū 1637 5371 39.75°N 140.80°E 1971 22 Akita-Yake-Yama Honshū 1366 4482 39.97°N 140.77°E 1997 23 Mount Asama Honshū 2544 8340 36.24°N 138.31°E 2009 24 Mount Azuma Honshū 1705 5594 37.73°N 140.25°E 1977 25 Mount Bandai Honshū 1819 5968 37.60°N 140.08°E 1888 -
Reconstruction of the 2014 Eruption Sequence of Ontake Volcano From
Oikawa et al. Earth, Planets and Space (2016) 68:79 DOI 10.1186/s40623-016-0458-5 FULL PAPER Open Access Reconstruction of the 2014 eruption sequence of Ontake Volcano from recorded images and interviews Teruki Oikawa1*, Mitsuhiro Yoshimoto2, Setsuya Nakada3, Fukashi Maeno3, Jiro Komori4, Taketo Shimano5, Yoshihiro Takeshita6, Yoshihiro Ishizuka1 and Yasuhiro Ishimine7 Abstract A phreatic eruption at Mount Ontake (3067 m) on September 27, 2014, led to 64 casualties, including missing people. In this paper, we clarify the eruption sequence of the 2014 eruption from recorded images (photographs and videos obtained by climbers) and interviews with mountain guides and workers in mountain huts. The onset of eruption was sudden, without any clear precursory surface phenomena (such as ground rumbling or strong smell of sulfide). Our data indicate that the eruption sequence can be divided into three phases. Phase 1: The eruption started with dry pyroclastic density currents (PDCs) caused by ash column collapse. The PDCs flowed down 2.5 km SW and 2 km NW from the craters. In addition, PDCs moved horizontally by approximately 1.5 km toward N and E beyond summit ridges. The temperature of PDCs at the summit area partially exceeded 100 °C, and an analysis of interview results suggested that the temperature of PDCs was mostly in the range of 30–100 °C. At the summit area, there were violent falling ballistic rocks. Phase 2: When the outflow of PDCs stopped, the altitude of the eruption column increased; tephra with muddy rain started to fall; and ambient air temperature decreased. Falling ballistic rocks were almost absent during this phase. -
Volcanic Plume Measurements Using a UAV for the 2014 Mt. Ontake
Mori et al. Earth, Planets and Space (2016) 68:49 DOI 10.1186/s40623-016-0418-0 FULL PAPER Open Access Volcanic plume measurements using a UAV for the 2014 Mt. Ontake eruption Toshiya Mori1* , Takeshi Hashimoto2, Akihiko Terada3, Mitsuhiro Yoshimoto4, Ryunosuke Kazahaya5, Hiroshi Shinohara5 and Ryo Tanaka6 Abstract A phreatic eruption of Mt. Ontake, Japan, started abruptly on September 27, 2014, and caused the worst volcanic calamity in recent 70 years in Japan. We conducted volcanic plume surveys using an electric multirotor unmanned aerial vehicle to elucidate the conditions of Mt. Ontake’s plume, which is flowing over 3000 m altitude. A plume gas composition, sulfur dioxide flux and thermal image measurements and a particle sampling were carried out using the unmanned aerial vehicle for three field campaigns on November 20 and 21, 2014, and June 2, 2015. Together with the results of manned helicopter and aircraft observations, we revealed that the plume of Mt. Ontake was not directly emitted from the magma but was influenced by hydrothermal system, and observed SO2/H2S molar ratios were decreasing after the eruption. High SO2 flux of >2000 t/d observed at least until 20 h after the onset of the eruption implies significant input of magmatic gas and the flux quickly decreased to about 130 t/d in 2 months. In contrast, H2S fluxes retrieved using SO2/H2S ratio and SO2 flux showed significantly high level of 700–800 t/d, which continued at least between 2 weeks and 2 months after the eruption. This is a peculiar feature of the 2014 Mt. -
Lahar Characteristics As a Function of Triggering Mechanism at A
Kataoka et al. Earth, Planets and Space (2018) 70:113 https://doi.org/10.1186/s40623-018-0873-x FULL PAPER Open Access Lahar characteristics as a function of triggering mechanism at a seasonally snow‑clad volcano: contrasting lahars following the 2014 phreatic eruption of Ontake Volcano, Japan Kyoko S. Kataoka1*, Takane Matsumoto1, Takeshi Saito2, Katsuhisa Kawashima1, Yoshitaka Nagahashi3, Tsutomu Iyobe4, Akihiko Sasaki5,6 and Keisuke Suzuki5 Abstract In association with the September 2014 phreatic eruption (VEI 1–2) at Ontake Volcano, a syn-eruptive and two post-eruptive lahars occurred in the Akagawa–Nigorigawa River, southern fank of the volcano. The present contribu- tion describes and discusses the contrasting features of the two post-eruptive lahars, which caused a major impact on downstream river morphology, and re-examines the description of the syn-eruptive lahar in the previous study. The frst post-eruptive lahar occurred 8 days after the eruption by the rainstorm (October 5, 2014, before the snowy season), and the second lahar was associated with the rain-on-snow (ROS) event on April 20, 2015, in the early spring of the snowmelt season. The October rain-triggered lahar, which can be interpreted as a cohesive debris fow, reached at least ~ 11 km downstream and left muddy matrix-rich sediments with high clay content (10–20 wt% of clay in matrix). The lahar deposits contain hydrothermally altered rock fragments, sulfde/sulfate minerals, and clay miner- als and show extremely high total sulfur content (10–14 wt%) in matrix part, indicating source material from the September phreatic eruption deposits.