Three-dimensional Structure of the Omiya and the Iriyamase Faults and Its Formation Process, the Eastern Margin of the Fujikawa-kako Fault Zone, the Northwestern Border of the Izu Collision Zone, Central Japan: Outcomes of the Multi-line Integrated Seismic Exploration in the Hoshiyama Hills
Tanio ITO; Ken'ichi KANO; Go SATO; Akira FUJIWARA; Toshiki WATANABE; Motonori HIGASHINAKA; Susumu ABE; Shintaro ABE; Noriko TSUMURA; Genjyu YAMAMOTO; Hisoshi SATO; Takaya IWASAKI; Tetsuya TAKEDA; Tatsuya ISHIYAMA; Kei ODAWARA; Masatake HARADA; Jiro KOMORI
Journal of Geography (Chigaku Zasshi), 25 Apr. 2024, [Reviewed]

Crustal Structure of the Northwestern Border of the Izu Collision Zone from the Fujikawa-kako Fault Zone to the Itoigawa–Shizuoka Tectonic Line, Central Japan: Outcomes of Integrated Seismic Exploration FIST2012
Akira FUJIWARA; Toshiki WATANABE; Motonori HIGASHINAKA; Susumu ABE; Tanio ITO; Ken'ichi KANO; Go SATO; Shintaro ABE; Noriko TSUMURA; Takaya IWASAKI; Tetsuya TAKEDA; Genju YAMAMOTO; Hiroshi SATO; Tatsuya ISHIYAMA; Kei ODAWARA; Masatake HARADA; Jiro KOMORI
Journal of Geography (Chigaku Zasshi), 25 Feb. 2024, [Reviewed]

Practical Examples of Geo-excursion in Online Classes
KOMORI Jiro
GEOGRAPHICAL SCIENCES, 28 Oct. 2022, [Reviewed]

The 2016 Eruptions of Niigata-Yakeyama Volcano: Eruption Model Based on the Sequence of Volcanic Activity and Petrography of Volcanic Ash
Yanagisawa Hiroaki; Oikawa Teruki; Kawaguchi Ryohei; Kimura Kazuhiro; Itoh Jun’ichi; Koshida Hirokazu; Kato Koji; Ando Shinobu; Ikeda Keiji; Utsunomiya Shingo; Bando Aiko; Okuyama Satoshi; Kamata Rintaro; Kodama Tokuro; Komori Jiro; Narama Chiyuki
BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN, 30 Sep. 2022, [Reviewed]
The 2016 eruptions of Niigata-Yakeyama volcano in central Japan consisted of several small eruptions that were accompanied by syneruptive-spouted type lahars. We have reviewed the sequence of the 2016 activity and modeled the eruptive processes based on observations of various volcanic phenomena, including ash fall and lahars, plumes, earthquakes and crustal deformation, and analysis of eruptive products. Eruptions of Niigata-Yakeyama volcano after the 20th century can be categorized into two types; 1) VEI＝0-1 eruptions during which ash fall covered only the summit area and no ballistic blocks were ejected (e.g., 1997-1998 event) and 2) VEI＝1-2 eruptions during which ash fall reached the foot of the mountain with ejected blocks (e.g., 1974 event). We also discuss the characteristics of the 2016 activity by comparing the sequence with those of other events of Niigata-Yakeyama volcano: the 1974 and 1997-1998 eruption events and the 2000-2001 intensified fumarolic event. The 2016 eruptions of Niigata-Yakeyama volcano are divided into the following six stages. Stage I was characterized by the onset of intensified steam plume emission activity (≥200 m). Stage II was characterized by the onset of crustal deformation, slight increase of high frequency earthquakes (approx.>3.3 Hz) and further activation of steam plume emission activity (≥500 m). The crustal deformation observed commenced at the beginning of Stage II and lasted until the end of Stage V. The total inflated volume was estimated to be approximately 7.2×10⁶ m³. Several very small eruptions that provided only a small amount of ash to the summit area also occurred. Stage III was characterized by a rapid increase of high frequency earthquakes accompanied by tilt change, and the onset of low frequency earthquakes (approx.<3.3 Hz). A small eruption was accompanied by a syneruptive-spouted type lahar at this time. Stage IV was characterized by the occurrence of several small syneruptive-spouted type lahars. The occurrence of high and low frequency earthquakes continued, but with decreasing abundance. Stage V was characterized by the highest altitude of steam plume emission (≥1,200 m), while no ash emission nor syneruptive-spouted type lahars were observed. Stage VI was characterized by a gradual decrease in steam plume emission and earthquake activity. The aerial photographs indicate the ash fall distribution, and the maximum scale of the 2016 eruption, which is estimated to be VEI＝1. The assemblage of altered minerals indicates that the volcanic ash originated from volcanic conduits affected by a high-sulfidation epithermal system and no magmatic components were detected. Judging from the depth of the crustal deformation source of magmatic eruptions at other volcanoes, the estimated source of crustal deformation during the 2016 eruption is considered to have been caused by a volume change of the magma chamber. The sequence of the 2016 event can be interpreted as follows: 1) magma supply to the magma chamber, 2) increase in seismicity and fumarolic activity triggered by volcanic fluid released from the new magma, 3) destruction of volcanic conduit by increased fumarolic activity and emission of volcanic ash, and 4) occurrence of syneruptive-spouted type lahars by the “airlift pump” effect. At Niigata-Yakeyama volcano, such small eruptions and fumarolic events have been frequently observed for the last 40 years. We thus consider that the accumulation of magma has progressed beneath the volcano, which is a potential preparatory process for a future magmatic eruption.

Total mass estimate of the January 23, 2018, phreatic eruption of Kusatsu-Shirane Volcano, central Japan
Nobuko Kametani; Yasuo Ishizaki; Mitsuhiro Yoshimoto; Fukashi Maeno; Akihiko Terada; Ryuta Furukawa; Ryo Honda; Yoshihiro Ishizuka; Jiro Komori; Masashi Nagai; Shinji Takarada
Earth, Planets and Space, Dec. 2021
On January 23, 2018, a small phreatic eruption (VEI = 1) occurred at the Motoshirane Pyroclastic Cone Group in the southern part of Kusatsu-Shirane Volcano in central Japan. The eruption ejected ash, lapillus, and volcanic blocks from three newly opened craters: the main crater (MC), west crater (WC), and south crater (SC). Volcanic blocks were deposited up to 0.5 km from each crater. In contrast, the ash released during this eruption fell up to 25 km ENE of the volcano. The total mass of the fall deposit generated by the eruption was estimated using two methods, yielding total masses of 3.4 × 10⁴ t (segment integration method) and 2.4 × 10⁴ t (Weibull fitting method). The calculations indicate that approximately 70% of the fall deposit was located within 0.5 km of the craters, which was mainly attributed to the low height of the eruption plume.

Special issue on e-ASIA JRP: Development of a landslide monitoring and prediction system in monsoon Asia
Akihiko Wakai; Go Sato; The Viet Tran; Jessada Karnjana; Jiro Komori
Journal of Disaster Research, 2021

Promotional activity for the Quaternary research to children through the preparation of mineral pigments
Komori Jiro
The Quaternary Research (Daiyonki-Kenkyu), Oct. 2017

Gravitational deformation as a precursor of shallow landslide within tephra-covered slope deposits in the Aso caldera, Japan
Sato, G; Goto, S; Kimura, T; Hayashi, S; Istiyanti, M.L; Komori, J
Journal of the Japan Landslide Society, Sep. 2017, [Reviewed]

The 2014 phreatic eruption of Ontake Volano and the subsequent erosion
Oikawa Teruki; Yoshimoto Mitsuhiro; Komori Jiro; Maeno Fukashi; Nakada Setsuya; Takeshita Yoshihiro; Shimano Taketo; Yoshihiro Ishizuka
The Journal of the Geological Society of Japan, 2017

Reconstruction of a phreatic eruption on 27 September 2014 at Ontake volcano, central Japan, based on proximal pyroclastic density current and fallout deposits the Phreatic Eruption of Mt. Ontake Volcano in 2014 5. Volcanology
Fukashi Maeno; Setsuya Nakada; Teruki Oikawa; Mitsuhiro Yoshimoto; Jiro Komori; Yoshihiro Ishizuka; Yoshihiro Takeshita; Taketo Shimano; Takayuki Kaneko; Masashi Nagai
Earth, Planets and Space, 01 Dec. 2016, [Reviewed]

Reconstruction of the 2014 eruption sequence of Ontake Volcano from recorded images and interviews
Teruki Oikawa; Mitsuhiro Yoshimoto; Setsuya Nakada; Fukashi Maeno; Jiro Komori; Taketo Shimano; Yoshihiro Takeshita; Yoshihiro Ishizuka; Yasuhiro Ishimine
EARTH PLANETS AND SPACE, May 2016, [Reviewed]

Reconstruction of a phreatic eruption on 27 September 2014 at Ontake volcano, central Japan, based on proximal pyroclastic density current and fallout deposits
Fukashi Maeno; Setsuya Nakada; Teruki Oikawa; Mitsuhiro Yoshimoto; Jiro Komori; Yoshihiro Ishizuka; Yoshihiro Takeshita; Taketo Shimano; Takayuki Kaneko; Masashi Nagai
EARTH PLANETS AND SPACE, May 2016, [Reviewed]

Sediment transport processes induced by Typhoon No.26 in 2013 along the Omiya-sawa River basin in Izu-Oshima Island, Japan
SATO Go; KOMORI Jiro; CHIBA Tatsuro; GOTO Satoshi; KISHIMOTO Hiroshi; HAYASHI Kazunori
Landslides, 2015
On October 16, 2013, Typhoon No.26 (Typhoon Wipha) passed through Izu-Oshima Island, approximately 100km south of Tokyo. On this day, the Motomachi district, on the northwestern slope of Mt. Mihara, experienced its heaviest rainfall in recorded history. The 24-h precipitation reached 824mm, inducing many shallow landslides and mudflows, particularly in the Okane-zawa river basin. Recent studies have shown that most of the landslides occurred along a boundary between high-permeability layers consisting of scoriaceous ash and low-permeability layers consisting of loess deposits. Many shallow landslides also occurred in the Omiyasawa river basin, which lies towards the south of the Okane-zawa river basin. However, the reason for these landslides and subsequent processes, such as mudflows, had not previously been clarified. In this study, we estimated the areas of the landslides and erosion and deposition sites from altitude changes determined using digital elevation models (DEMs) developed before and after the typhoon. Through field surveys, we also found that the topographies and processes of the shallow landslides in the upper Omiya-sawa basin differed from those in the Okane-zawa basin. The landslides in the Omiya-sawa basin occurred along a boundary between scoriaceous ash layers and low-permeability layers consisting of lava and lahar deposits.

Provision of Risk Information for Geopark Guests in Japan
Jiro Komori
E-journal GEO, Apr. 2014, [Reviewed], [Invited]
Risk information and its appropriate provision are important for geopark guests. The possible risks to guests are calculated

using the statistical police white papers on mountain accidents in Japan. They show that the major risk factors in geoparks are

falls and slip drops, encounters with dangerous animals, and rock falls. However, it is nearly impossible to find descriptions

and discussions of geopark risks in specialized articles and books on geopark activities. Furthermore, two-thirds of official geopark websites do not contain risk information. The remaining one-third contain only short phrases or single paragraphs on

potential risks. For the safety of geopark guests, effective releases of information on risks via Internet websites and in print media are required when advertising the attractiveness of geoparks.

Glacial Lake Outburst Events in the Bhutan Himalayas
J. Komori; T. Phuntsho; T. Koike; Yamanokuchi, T
Global Environmental Research, May 2012, [Reviewed]
Maintaining proper preparedness for GLOF hazards and drawing attention to the task of mitigation are important goals, necessitating exploration of past cases of outbursts. The frequency of GLOF occurrences is still unknown, because major outbursts which cause significant damage downstream are rare and records have been kept on them for only the past several decades. We have to collect as much data on past outburst events as possible, including unpublished and previously unknown incidents. As is obvious in the traces of known GLOFs, an outburst event leaves typical topographical and sedimentological features, i.e., 1) V-shaped trenches, 2) huge debris fan depositions and 3) subsequent devastated river beds. Hence, these features can be used as proof of past outburst events. We chose to study the 2009 Tshojo flood as the most recent case of a GLOF in the Bhutan Himalayas. The flood, which was initiated by dam leakage and water splashing on the surface due to en-/sub-glacial collapse, was a potentially dangerous hazard. Attention to such outburst events from invisible sources will be required in the future.

As for evaluating the frequency of GLOF incidents, besides the six cases reported in previous studies, we revealed a total of 15 other outburst cases in the Bhutan Himalayas using field survey data; Corona KH-4A, Hexagon KH9-9, Landsat7/ETM+, and ALOS/PRISM satellite data; and images from Google Earth.. These 21 cases were found on the Tibetan branch of the Kuri Chu, and the Chamkhar Chu, Pho Chu, Mo Chu and Soe Chu rivers. Lake outbursts at the foot of cliffs with hanging glaciers were the most frequent cases, accounting for ten of the GLOFs. Seventeen of the 21 cases occurred before the 1970s, while four cases were counted during the period from the 1970s to 2010. Hence, the current frequency of outburst occurrences does not seem to have increased. Further research is urged, covering minor outburst events, and the scope has to be broadened at least to the Sikkim and Nepal Himalayas.

Landslide Geology and Geomorphology of the Nagashirisawa and Kanayamazawa Basins, the East Side of Mount Shiroumadake, Northern Hida Range, Central Japan
KARIYA Yoshihiko; SATO Go; KOMORI Jiro
J. Geogr., 25 Apr. 2012
This paper describes landslide features observed in the Nagashirisawa Basin and Kanayamazawa Basin east of Mount Shiroumadake (central Japan), where mid- to late-Pleistocene mountain glaciers are thought to have developed. Geomorphological analyses accompanied by a study of airphoto interpretation and a geological survey show gentle slopes, low-relief ridges and mounds in the basins. In most cases, angular gravels in major deposits of these landforms comprise either one or a few kinds of bedrocks exposed near the slopes. No gravels originating from any other geology in the basins are found. Jigsaw-brecciated clasts and folded-elongated silt patches in the major deposits can also be distinguished. Landslide processes, including the gravitational deformation of bedrock (i.e., mass rock creep), are probable causes of these features. Chronological information suggests that a major landslide occurred during the period from late Pleistocene to late Holocene. The triggers of these landslides remain incompletely understood, glacial–interglacial climate changes along with precipitation variations, as well as paleoearthquakes originating from nearby active faults, might be important. Some landslides found in the basins overlap moraines identified by previous research. Historical geomorphology of this area requires further study.

Landslide-induced terminal moraine-like landforms on the east side of Mount Shiroumadake, Northern Japanese Alps
Yoshihiko Kariya; Go Sato; Jiro Komori
GEOMORPHOLOGY, Apr. 2011, [Reviewed]

Natural Disaster in Bhutan in 2009 – Geo-hydrological and climatic hazards
Jiro KOMORI; Toru KOIKE; Daisuke HIGAKI; Phuntsho TSHERING
Journal of Japan Society for Natural Disaster Science, 2010, [Reviewed]
Natural disasters intensively took place in Bhutan in 2009. For instance, unusual

outflow from debris covered glacier, floods and natural damming of a river induced by

a cyclone, watery mishap in the river recreation and earthquake struck the country as abrupt and unexpected events. Furthermore, slope failures interrupted the highway

traffics, because of steep and geologically fragile slopes. These climatic and geohydrologic disasters revealed various risks and issues of the natural hazard in Bhutan.

As for the issues, establishment of weather and seismographic observation network and

its information spreading throughout the society are particularly required. Documentation and mapping of experienced various disasters in and around Bhutan are essential. It is also important to mention that technical development and awareness creation regarding hazard mitigation should be enhanced at the national and local governments and community levels.

富士山南東斜面の雪代イベントの特徴と発生予測　　　　　　　　　　　　　　　
2010, [Reviewed]

Monitoring Rockfall and Supranival Debris Movement in the Shirouma Daisekkei Valley, Northern Japanese Alps
KARIYA Yoshihiko; MATSUNAGA Yu; MIYAZAWA Yosuke; KOMORI Jiro; ISHII Masaki; SATO Go
J. Geogr., 25 Oct. 2008
The Daisekkei Valley (1600-2300 m ASL) is a late Pleistocene glaciated trough in the northern Japanese Alps, and its attractive landscape has enchanted many climbers. Even today, there is a late-lying snowpatch 2 km long at the bottom of the valley in midsummer. Unique natural conditions in and around the Daisekkei Valley (e.g., Quaternary rapid uplift, complex geology, humid climates, sparse vegetation cover) have been responsible for the occurrence of various geomorphic changes that threaten climbers. This study, using an image data-logger capable of capturing a JPG image with a fixed time-interval in the summer of 2007 reveals supranival debris movements, micro-weather conditions and the behavior of climbers in the Daisekkei Valley. Analysis of captured images indicates that the daily numbers of dangerous supranival debris movements gradually decreased from early June to early August and supranival debris movements were caused by rock fragments moving in from valley walls or tributaries to the snowpatch, as well as posture changes of rock fragments on the snow surface with rapid ablation. Besides, image-inspection allows us to consider the relationships among climber traffic, micro-weather, and holiday almanac. Using an image data-logger for monitoring geomorphic changes is considered to be effective for analyzing alpine environments.

New Radiocarbon Ages from Unconsolidated Deposits in the Kitamatairi River Basin, the Eastern Mount Shirouma-dake, Central Japan
KARIYA Yoshihiko; SATO Go; KOMORI Jiro
J. Geogr., 25 Jun. 2008
The Kitamatairi River basin has been considered to be a type-location of Pleistocene multiple glaciations of the northern Hida Mountains, central Japan. However, recent geomorphological studies performed in the adjacent area have clarified that the landforms and unconsolidated deposits both of which have been believed to be of glacial origin (i.e., moraines and tills) were deformed or actually formed by landslides. This suggests that both morphogenetic and chronologic reappraisals of landforms and deposits are also necessary in the Kitamatairi River basin. Hence, we measured new radiocarbon ages of unconsolidated deposits in the Kitamatairi River basin (replications for 7 samples from 2 sites and new measurements for 9 samples from 7 sites). All replications showed significant older ages (>20 ky) than previously reported ages. New ages range from late Holocene to late Pleistocene, or before. The chronological concept for landform development in the Kitamatairi River basin should be revised.

Recent expansions of glacial lakes in the Bhutan Himalayas
Jiro Komori
QUATERNARY INTERNATIONAL, Jun. 2008, [Reviewed]

Rockfall hazard in the Daisekkei Valley, the northern Japanese Alps, on 11 august 2005
Yoshihiko Kariya; Go Sato; Kuniyasu Mokudai; Jiro Komori; Masaki Ishii; Ryoko Nishii; Yosuke Miyazawa; Noriko Tsumura
LANDSLIDES, Mar. 2007, [Reviewed]

ジュンガル盆地の湖沼・湖沼堆積物について−新疆の地形・気候の特徴を踏まえて−　　　　　　　　　　　　　　　
Feb. 2007

Glacial Lake Expansion and Present Situation in Hinku and Hongu Regions, Eastern Nepal and Bhutan Himalaya
KOMORI Jiro
J. Geogr., 2006, [Invited]
Records of recent changes in growing ice-contact lakes in the Bhutan-China border region are investigated using satellite imagery. The results show that lake growth has continued at a growth rate of< 70 m/year in length and < 0.04 km²/year in area. In the debris-covered area of the glacier, the lake expands in stages through the initial appearance of supraglacial lakes and subsequent expansion of a coalesced lake. In the small debris-free or partially debris-covered glacier, the lake expands simply from a single lake. The initial year of appearance of most of the lakes at the southern and northern sides of the Himalayan mountains ranges from the 1950s to the 1970s and before the 1950s, respectively. Furthermore, the trace of the glacial lake outburst flood (GLOF) in the Hinku valley, and the present situation of the glaciers and the glacial lakes in the Hongu valley in eastern Nepal are confirmed by the field survey. Many boulders and coarse sands generated from the GLOF in 1998 remain distinctly and continuously at least 10 km downstream from the collapsed lake as a bare river bed with thick debris flow deposit. The assessment considered that there are no serious conditions regarding the GLOF given the present situation of both valleys. Comparison with previous data shows that the retreat speed of glaciers at the headwater of the Hongu valley is approximately 8 m/year.

Rockfall hazards in tne Shirouma Daisekkei valley, the northern Japanese Alps, on August 11, 2005 Survey team for the Shirouma Daisekkei rockfall hazards on August 11, 2005
Survey team for; the Shirouma; Daisekkei rockfall hazards on Augus
Nov. 2005, [Reviewed]

Glacial lake development and the record of outburst flood in the north-central Bhutan and Kulha Kangri massif, Eastern Himalaya　　　　　　　　　　　　　　　
2005, [Reviewed]

Landslide associated with steam explosion in the active geothermal field in Japan　　　　　　　　　　　　　　　
2005, [Reviewed]

Variation and lake expansion of Chubda Glacier, Bhutan Himalayas, during the last 35 years
KOMORI Jiro; GURUNG Deo Raj; IWATA Shuji; YABUKI Hironori
2004, [Reviewed]

東京世田谷区北部の淀橋台地西端における第四紀後期層序
2000, [Reviewed]

P-267 Paleomagnetic secular variation around Taihu-Lake, Eastern China.
HASEGAWA Fumihiko; KOMORI Jiro; YONEDA Minoru
Annual Meeting of the Geological Society of Japan, 2000

Secular variation of geomagnetic inclination recorded in sediments from southwestern Yangtze delta, China　　　　　　　　　　　　　　　
KOMORI Jiro; HASEGAWA Fumihiko; ENDO Kunihiko; YU Lizhong; ZHENG Xiangmin; ITOTA Chizu
Water environments and mankind, University Research Center, Nihon University, Jan. 2000

地すべり・土石流災害と水蒸気爆発による火山灰　　　　　　　　　　　　　　　
Nov. 1998

平成9年度中国太湖調査・分析経過報告　　　　　　　　　　　　　　　
Aug. 1998

Phreatic explosion and landslides/debris flows on 11th May, 1997, in Hachimantai Kumazawa Landslide, Akita Prefecture　　　　　　　　　　　　　　　
ENDO Kunihiko; CHIBA Tatsuro; KOMORI Jiro
平成9年度文部省科学研究費補助金(基盤研究C)研究成果報告書, Mar. 1998

1997年5月11日八幡平澄川地すべりにおいて発生した水蒸気爆発－噴出物調査にもとづく検討－
1998

Pyroclastic flow, surge and blast deposits in the destoroied house
CHIBA Tatsuro; NAGAI Daisuke; KITSUKAWA Takashi; ENDO Kunihiko; KOMORI Jiro; MORITA Akio
Annual Meeting of the Geological Society of Japan, 1998

Geological approach to pyroclastic flow/surge deposits generated in the Unzen-Fugendake Eruption —reconstruction of eruptive sequence, analysis of transport process and the relation to volcanic disaster—
ENDO Kunihiko; KITSUKAWA Takashi; NAGAI Daisuke; KOMORI Jiro
Annual Meeting of the Geological Society of Japan, 1998

Phreatic explosion on 11th May, 1997,at Sumikawa, Hachimantai, Akita Prefecture
KOMORI Jiro; ENDO Kunihiko; CHIBA Tatsuro; WATANUKI Takuya; NAGAI Daisuke; OBASE Mitsuru; FUJII Toru
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 1997

Tephras of the 1991 Unzendake Eruption
Miyahara T.; Endo K.; Shinkawa K.; Yasui M.; Komori J.; Ohno M.; Chiba T.; Tohno I.; Iso N.; Senda K.
PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN, 1991

AIによる画像認識と画像生成を用いた授業素材の検討 ー大衆化した人口知能の地学能力の記録を兼ねてー　　　　　　　　　　　　　　　
Jun. 2025

多様な時間的・空間的スケールの理解を促すための小・中・高校生向けアウトリーチ—小特集 アウトリーチ : 地学の魅力を広げる新たな展開
2024

「おうちで地学」Vol. 3, 4 実施報告
18 Jul. 2023

おうちで地学(5)著者と語ろう! 伊与原新氏をお招きして : インタビューの概要紹介
2023

全国大会シンポジウムの概要とテーマ「オンライン教育」の変遷
30 Jun. 2021

Reconstruction of the 2014 eruption sequence of Ontake Volcano from recorded images and interviews the Phreatic Eruption of Mt. Ontake Volcano in 2014 5. Volcanology
Teruki Oikawa; Mitsuhiro Yoshimoto; Setsuya Nakada; Fukashi Maeno; Jiro Komori; Taketo Shimano; Yoshihiro Takeshita; Yoshihiro Ishizuka; Yasuhiro Ishimine
Earth, Planets and Space, 01 Dec. 2016

The 2014 Eruption of Ontake Volcano, Central Japan
OIKAWA Teruki; YAMAOKA Koshun; YOSHIMOTO Mitsuhiro; NAKADA Setsuya; TAKESHITA Yoshihiro; MAENO Fukashi; ISHIZUKA Yoshihiro; KOMORI Jiro; SHIMANO Taketo; NAKANO Shun
Bulletin of the Volcanological Society of Japan, 2015
Volcanological Society of Japan

富士山の登山環境と御殿場ルートの魅力
Jun. 2014, [Invited]

氷河・氷河湖・川から見たブータン
May 2014, [Invited]

ブータンヒマラヤにおける氷河・氷河湖相互作用
津滝俊; 藤田耕史; 山口悟; 坂井亜規子; 縫村崇行; 杉山慎; 小森次郎; 竹中修平; TSHERING Phuntsho
雪氷研究大会講演要旨集, 2012
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering

Glacial lake outburst floods in Bhutan: a project for safety of the people
Kagaku, Jun. 2011

Field survey report on variations of small glaciers in the Bhutan Himalayas, 2010 autumn
Naito Nozomu; Yamaguchi Satoru; Sawagaki Takanobu; Komori Jiro; Tshering Phuntsho; Ghalley Kharka Singh
Summaries of JSSI and JSSE Joint Conference on Snow and Ice Research, 2011
The Japanese Society of Snow and Ice / Japan Society for Snow Engineering

A GLOF lesson from Peru　　　　　　　　　　　　　　　
2010

2009年4月29日のブータンヒマラヤTshojo氷河からの異常出水　　　　　　　　　　　　　　　
2010, [Reviewed]

富士山を中心に見た高山地域の災害と環境―シンポジウム総合討論のまとめとして　　　　　　　　　　　　　　　
2010

Utilizing the knowledge of geomorphology to moutain recreation : a lesson of rockfall hazard in the Daissekkei Valley in Shirouma-dake
KARIYA Y.; SATO G.; MOKUDAI K.; KOMORI J.; ISHII M.; NISHII R.; MIYAZAWA Y.; TSUMURA N.
10 Mar. 2006

白馬岳大雪渓で落石発生　　　　　　　　　　　　　　　
2006

白馬大雪渓の落石事故から安全対策を考える
2006

ネパールヒマラヤ，ヒンク谷サバイ氷河湖の決壊の痕跡　　　　　　　　　　　　　　　
2006

日本アルプスの景観形成に果たす地すべりの地形学的役割の評価．巡検に参加して　　　　　　　　　　　　　　　
2005

最近45年間のブータンヒマラヤ,チョブダ氷河の変動と氷河湖の拡大
2003

日本第四紀学会巡検「上高地の自然環境と焼岳の火山地質」参加報告　　　　　　　　　　　　　　　
2002

書評：「天然ダムと災害」　　　　　　　　　　　　　　　
2002

東京世田谷区北部の淀橋台地西端における第四紀後期層序
2000

長江デルタ南部における更新世末期から完新世堆積物のコア層序と海水準変動記録　　　　　　　　　　　　　　　
KOMORI Jiro; HASEGAWA Fumihiko; ENDO Kunihiko; ISHIHARA Sonoko
Japan earth and planetary science joint meeting, 09 Jun. 1999

第7回第四紀学会講習会参加報告
01 Apr. 1999

1997年5月11日八幡平澄川地すべりにおいて発生した水蒸気爆発--噴出物調査にもとづく検討
1998

ボーリングコア亀裂面の褐色汚染度評価と岩盤透水性・孔内水位の相関性の検討
1997

Grain size of the June 24, 1993 pyroclastic flow in Senbongi area, Unzen Volcano.
ENDO Kunihiko; SAKAI Munehisa; KOMORI Jiro; NAGAI Daisuke; KAKEGAWA Naoko; KIKUMOTO Norio; SUMAKI Motoko
日本火山学会講演予稿集, Nov. 1996
The Volcanological Society of Japan

Some Charactors of Eruptive Products of 1991 Unzen-Hugendake Eruption
ISO Nozomi; ENDO Kunihiko; MIYAHARA Tomoya; TOHNO Ikuo; CHIBA Tatsuro; SENDA Katsuya; KOMORI Jiro; NAKAMURA Mahito
Annual Meeting of the Geological Society of Japan, Mar. 1992
The Geological Society of Japan

図説世界の気候事典
Contributor
Jul. 2022
9784254161328

フィールドワークの安全対策(FENICS 100万人のフィールドワーカーシリーズ9) (FENICS100万人のフィールドワーカーシリーズ)
Contributor
08 Jan. 2020
4772271309

実践 統合自然地理学　　　　　　　　　　　　　　　
Contributor
Jul. 2018

気候変動の事典　　　　　　　　　　　　　　　
Contributor
Dec. 2017

アサヒエコブックス「地球環境変動の研究を追う」　　　　　　　　　　　　　　　
Mar. 2010

極圏・雪氷圏と地球環境「環境変化に伴なう雪氷圏の災害」　　　　　　　　　　　　　　　
Mar. 2010

山岳科学ブックレット No.1．登山道の安全を考える　　　　　　　　　　　　　　　
2009

ＡＩの生成物を使った防災と電力エネルギーに関する授業実践　　　　　　　　　　　　　　　
21 Sep. 2025

漁港の存在により発達した商店街の抽出 -近隣型商店街における一類型-　　　　　　　　　　　　　　　
21 Sep. 2025

Preliminary Research on Tsunami Hazard Assessment for Active Volcanoes in the Kuril Islands　　　　　　　　　　　　　　　
28 May 2025

AIの生成物の誤りを活用した地球科学・防災教育の教材化の検討　　　　　　　　　　　　　　　
25 May 2025

モレーン堰き止め型氷河湖の湖盆形状　　　　　　　　　　　　　　　
Aug. 2017

A case study of ice avalanche and subsequent flood from Mt. Annapurna, Nepal -alarming phenomena other than GLOFs in the Himalayan glacier-　　　　　　　　　　　　　　　
Aug. 2015

富士山東斜面の雪代現象の特徴と雪崩発生の素因　　　　　　　　　　　　　　　
May 2015

Educational experience of earth science using hand auger boring and soil temperature measurement by elementary students　　　　　　　　　　　　　　　
Jiro Komori
09 Aug. 2014

Curriculum research on comprehensive and basic science required courses that incorporate STEAM principles
Grant-in-Aid for Scientific Research (B)
National Astronomical Observatory of Japan
01 Apr. 2022 - 31 Mar. 2026

STEAMの理念を取り入れた総合的・基礎的な理科必修科目に関するカリキュラム研究
01 Apr. 2022 - 31 Mar. 2026

The foundation and development of Suyab, an ancient multicultural trading city of the Silk Road: Coexistence of agricultural-urban and transhumance spheres
Grant-in-Aid for Scientific Research (S)
Teikyo University
05 Jul. 2021 - 31 Mar. 2026

Reconstruction of Geoscience education as a fusion of humanities and sciences based on the SDGs and the Anthropocene
Grant-in-Aid for Challenging Research (Exploratory)
Shiga University
30 Jun. 2023 - 31 Mar. 2025

ジオシステムの視点を導入した自然災害に関する科学教育の開発
01 Apr. 2020 - 31 Mar. 2023

ネパールヒマラヤにおける活断層の地震危険度推定と持続可能な防災教育開発　　　　　　　　　　　　　　　
Oct. 2018 - Mar. 2023

Spatial distribution and development of glacier-derived rock glacier in the northern Tien Shan.
Grant-in-Aid for Scientific Research (B)
Niigata University
01 Apr. 2019 - 31 Mar. 2022
In the northern Tien Shan of Central Asia, we clarified the distribution and topographical environment of rock glacier, which are the index topography of mountain permafrost based on satellite data analysis and GIS.The number, size, and altitude of rock glaciers differed in each mountain range. In the Kyrgyz Range, the topographical environment of rock glacier was investigated using topographical factors such as glacier area, rock glacier area, rock wall area, glacier elevation range, glacier shrinkage area, geology,and talus. Our results show the environment that remains ice when glaciers shrink is that the ratio of glacier area to the rock wall area is smaller. This condition was also applicable to rock glacier. In addition to the topographical environment, a climatic environment in which mountain permafrost can be maintained is important.

3Dプリンターと国土地理院電子データ等の活用による地形･環境･防災教育の複数校種における実践
Aug. 2019 - Jul. 2020

Using a sediment core in earth science class: substituting a geological excursion
Grant-in-Aid for Scientific Research (C)
Chiba Institute of Science
01 Apr. 2016 - 31 Mar. 2019
We focused on improvement of earth science class in school, and proposed an educationally supporting system, “rent a core” and “extract a core” services. Rent a core service was composed of both preparing sediment cores and using cores in school class, by a scientist. It was applied in five school classes and one training sessions for renewing educational personnel certificate. School teacher evaluate it well, with good impression to students and without time and effort. Extract a core service was applied in two school classes and one training sessions for renewing educational personnel certificate. It was not popular for school teacher, owing to difficulty to select a logging site, coordinate to administrator and spend much time.

Shallow structure of the Fujikawa-kako fault system revealed by 3D FWI
Grant-in-Aid for Scientific Research (A)
Teikyo Heisei University
01 Apr. 2014 - 31 Mar. 2017
The results of this study are summarized as follows. (1) The Omiya and the Iriyamase faults that represent the frontal faults of the Fujikawa-kako fault system, form a single w-dipping reverse at depth. The dip of the fault becomes gentler towards the surface, and nearly horizontal beneath the eastern cliff of the Hoshiyama Hills, although it does not breach the surface. As a result, the cliff does not correspond to the fault scarp, but to the flexure of the hanging wall associated with the subsurface faulting. (2) The hinge of the flexure follows the eastern edge of the cliffs forming a horseshoe shape. This suggests that the eastward displacement of the hanging wall is estimated to be larger at the tip of the horseshoe and smaller at its sides, which is common for hanging walls of thrusts. (3) It is necessary to reexamine MEXT’s (2010) evaluation of the Fijikawa-kako fault system activity assuming the Omiya and the Iriyamase faults to be high-angle normal faults.

富士山の落石と雪代災害の危険度評価と社会周知の研究
Apr. 2014 - Mar. 2017

ヒマラヤにおける氷河災害の発生傾向の解明と理解普及の試み　　　　　　　　　　　　　　　
Jun. 2014 - May 2015

Integrated seismic experiments with active and passive sources for revealing the crustal structure of the collision / subduction transition zone on the northwestern border of the Izu arc
Grant-in-Aid for Scientific Research (A)
Teikyo Heisei University
01 Apr. 2011 - 31 Mar. 2014
Integrated seismic experiments from the Fujikawa-kako fault system to the Itoigawa-Shizuoka tectonic line have revealed crustal structures and their activities as follows.
1. The Fujikawa-kako fault system, a W-dipping reverse fault system, is traceable downward very close to the upper surface of the Philippine Sea plate. 2. The Omiya fault, the eastern margin of the fault system, is not a high-angle normal fault, but a low-angle thrust near the surface. 3. The activities of the fault system must be evaluated too low, if the present method based only on the vertical displacement rate is adopted. 4. 3-D investigations are necessary for more precise evaluations because lateral displacements cannot be ignored along the fault system. 5. The activities of the Itoigawa-Shizuoka tectonic line and its associated faults diminished considerably by the end of Pliocene. Since early Pleistocene, dominant fault activities have shifted eastward into the Fujikawa-kako fault system.

ブータンの気象災害研究　　　　　　　　　　　　　　　
Jul. 2012 - May 2013

Study on GLOFs（Glacial Lake Outburst Floods）in the Bhutan Himalayas　　　　　　　　　　　　　　　
Oct. 2008 - Mar. 2012

2006 - 2007

多摩川の砂礫洲の形成とその変遷に関する研究　　　　　　　　　　　　　　　
2007

温暖化によるヒマラヤの氷河湖の分布に関する研究　　　　　　　　　　　　　　　
2005 - 2006

ヒマラヤの氷河湖拡大に関する研究　　　　　　　　　　　　　　　
2005 - 2005

オホーツク海の古海洋変動に関する研究　　　　　　　　　　　　　　　
2004 - 2005

かわさき市民アカデミー 講師
lecturer
Oct. 2014 - Present

三浦半島の地震の痕跡をさぐる
01 Apr. 2013 - 31 Mar. 2014

雷龍の国（ブータン）で暮らす -地球温暖化についてみんなで考える-
lecturer
11 Aug. 2013

夏の小学生理科実験教室 「東京の地下を掘って，測ってみよう」
lecturer
26 Jul. 2013

雷龍の国で暮らす
2013

夏の小学生理科実験教室 「空気の流れを見て，測ってみよう」　　　　　　　　　　　　　　　
lecturer
Jul. 2012

都立三田高校地学授業－ブータンヒマラヤの遠隔授業　　　　　　　　　　　　　　　
Sep. 2011 - Oct. 2011

NPO地球対話ラボとの遠隔授業
Sep. 2011 - Oct. 2011

夏の小学生理科実験教室 「二酸化炭素で遊ぼう」　　　　　　　　　　　　　　　
lecturer
Jul. 2008

道路の下に“見えない川”水位上昇であふれ出して冠水…潜む「暗渠（あんきょ）」のリスク 道の「石碑」にヒント
21 Oct. 2025, Media report

都市部ならではの浸水被害の特徴は　　　　　　　　　　　　　　　
22 Sep. 2025, Media report

都市部の大雨 相次いだ浸水被害 その理由は？専門家に聞く
12 Sep. 2025, Media report

Introduction of the relationship between type flooding and topography in the Tokyo metropolitan area in relation to the approach of Typhoon No. 7 in 2024 and examples of individual countermeasures.　　　　　　　　　　　　　　　
15 Aug. 2024, Media report

Commentary on fluvial cliffs and slope failure hazards in Tokyo metropolitan area.
25 Jul. 2024, Media report

都市でも土砂災害リスクが?川が生み出した“河食崖” 川崎･東京都内をみる
Jul. 2024, Internet

旧河道 都市の“見えない川”とは ～浸水に備えるポイント 川崎市と東京・大田区の事例から
Jun. 2024, Internet

Explanation of the relationship between microtopography ‘old river channels’ and flood risk, and how to identify them in the field.
Jun. 2024, Media report

Phantom ice pond on Mt. Fuji
09 Mar. 2022, Paper

2019年東日本台風による多摩川下流域の浸水に関する解説
19 Oct. 2020, Media report

The map still knows nightmares.
Oct. 2020, Internet

Commentary on the 5 March 2018 mudslide at Mt. Fuji
Mar. 2018, Media report

Commentary at the affected site on avalanches and mudslides on Mt. Fuji
Mar. 2018, Media report

Commentary at the affected site on the slash avalanche on Mt. Fuji
06 Apr. 2014, Media report

ブータン・ヒマラヤの氷河湖決壊洪水　　　　　　　　　　　　　　　
03 Apr. 2014