2014 Hiroshima landslides explained

2014 Hiroshima landslides
Place:Hiroshima Prefecture, Japan
Coordinates:34.487°N 132.494°W
Also Known As:広島土砂災害(Hiroshima Dosha Saigai), 平成26年8月19日からの豪雨災害(Heisei 26-nen 8 tsuki 19-nichi Kara no Gōu Saigai)
Cause:Landslide due to heavy rain
Reported Deaths:74[1]
Reported Injuries:69
Reported Missing:0

On 20 August 2014, Hiroshima Prefecture in Japan was struck by a series of landslides following heavy rain. The rain triggered 166 slope failures which included 107 debris flows and 59 shallow slides.[2] The landslides hit residential areas including Kabe, Asakita Ward, Yagi, Yamamoto, Midorii, and Asaminami Ward.[3] Of these areas, the Asakita and Asaminami Wards in Northern Hiroshima were hit the hardest.

Following the rainfall, Hiroshima issued an evacuation advisory at 4:15 am. Mayor Kazumi Matsui confessed regret over the advisory's late issuance and recommended that the city study the incident to improve the process. Under the law which took effect in 2001, prefectural governments and other authorities must carry out on-site research to designate areas for which evacuation plans and hazard maps will be created. In Hiroshima there are about 32,000 possibly dangerous areas, the highest of all 47 prefectures. There were 44 injuries and 74 deaths. According to the police, the deaths included three boys aged two, three and eleven.[4] [5]

Landslide characteristics

The debris flows covered a 10 km by 2 km region that ran from NE to SW. The most impacted area was Yagi 3-Chome, located near the Midorigaoka prefecture. Within this area, landslides and debris flows occurred behind the Abu-no-Sato housing complex, Mitsuhiro Shine, and Midorigaoka prefectural apartments.[6] The characteristics of some of these flows are described below.

Midorigaoka debris flow

The Midorigaoka debris flow, located in the Asaminami Ward, entered the residential area and spread out across a large area while continuing for a considerable distance. It consisted of mainly coarse granite. This material was transported out of the terminal area of the channel, and deposited into the residential area. Within these deposits, fine granite soil particles were found. After 10 days from the event, large amounts of water was found near the source of this flow, resulting in muddy conditions. Overall, around 33,000m3 of soil mass was generated by the debris flow.

Abu-no-Sato debris flow

The Abu-no-Sato debris flow, located in the Asaminami Ward, consisted of two separate channels. They came to a stop before the residential area, and was about 5m wide and 30m long. It consisted of metamorphic and sedimentary rocks (e.g., hard hornfels rock), with very little granite. The flows went through a narrow gully, then dropped down almost vertically for approximately 5m. Through its travel, the flow picked up various debris which resulted in the deposits consisting of fractured hornfels and colluvium.

Causes

Rainfall

The main triggering cause for the event was the highly intense, short duration rain that occurred in the area. Due to the warm, moist air from the Akisame front which passed over the western Shugoku Mountains, cumulonimbus clouds began to develop in the northwest of Hiroshima City. These rainy conditions were unusual, highly extreme, and difficult to predict. Following the torrential rain, in which over 200mm of cumulative rainfall fell, several landslides were triggered near a mountain beside the city of Hiroshima. Asakita-ku was the hardest-hit ward. It received of rain from 1:30 am to 4:30 am causing two landslides which occurred between 4 am and 6 am. This significant volume of rain hit the surface, resulting in constrained groundwater in the water-bearing layer and a development of a head. The layer then collapsed as a result of the confined water pressure's uplift force.

Geological conditions

As there were faults, fracture zones, and joints in the area, there were several locations with significant permeability. Due to the heavy upstream rainfall, the groundwater in these places turned into artesian water. As a result, the slopes experienced destabilization.

The Midorigaoka debris flow was composed of coarse granite, which easily develops sheeting joints and micro-sheeting joints. These joints in weathered granite make the area more easy to erode away. As a result, the volume of the flow increased in size and energy as it flowed down the gully. The deposits were also rich in fine granite soil particles which can decrease the permeability of the flow and cause greater mobility. Due to these characteristics, the flow traveled far and had a great spread. Yagi 3-Chome, which had the most damage reported, lies between an area composed of granite.

The Abu-no-Sato debris flow was composed of hard horfels rock, which is large in size. Thus, the permeability was quite high, resulting in less transportation. The flow deposits, then, did not reach the residential area, but were found at the bottom of the wide and gently-sloped gully. However, deaths still occurred in the area due to a collapse of an old debris flow deposit terrace that mobilized boulders and trees into the complex area.

Casualties

As of 20 September 2014, at least 70 people have died as a result of the landslides. One of the dead was a rescue worker killed after the hillside collapsed a second time. Two children, aged 2 and 11, died in a mudslide in Asaminami-ku around 3:20am.[7] The number of casualties was initially feared to be 100.[8] The number missing was reported to be 52 on the morning of 22 August, but in the afternoon it was revised to 47,[9] then to 46 on the morning of the 23rd, and later on the morning of the same day to 43.[10] On 9 September, police announced that they had found one body, which has since been identified.[11] Another body was found on 18 September,[12] which has since then been also identified.[13]

On 23 August, Hiroshima city was considering publishing a list of missing persons to speed up safety confirmation.[14] A missing persons list with 28 names in it was published on 25 August.[15] As of 19 September, all bodies of 28 of those listed have been found and identified.[13] [16]

Burials for two of the youngest victims – eleven years old and two years old – and the firefighter, were conducted on 22 August.[17] [18]

Buddhist memorial service was held on 23 September[19] and Shijukunichi service for ten victims on 28 September,[20] for several others on 4 October[21] and officially on 7 October.[22]

Rescue efforts

Japanese Prime Minister Shinzo Abe directed the military to deploy hundreds of personnel to assist the local rescue teams.[4] Japanese Red Cross[23] and the NPO Peace Winds Japan[24] also sent staff, and an estimated 1,300 people have volunteered. Disaster Volunteer of Hiroshima City decided to discontinue activities on 24 August.[25] Volunteers continued later, but stopped temporarily on 4 September because of bad weather.[26]

An estimated 2,000[27] –3,600[28] rescuers consisting of firefighters, police and members of the Self-Defense Force took part in searching and clearing debris despite rain and dangerous conditions that hampered and sometimes halted their efforts. There was also ongoing risk for a secondary disaster, and more rain was forecast for the area.[29] Consequently, residents on Asakita and Asaminami were told to evacuate.[30] Because schools were being used as shelters, several had to postpone the start dates.[31] All elementary school shelters were closed 1 November.[32]

Evacuation advisories were partially lifted for Asaminami-ku on Sunday, 31 August, allowing about 14,400 persons (around 5700 households) to return to their homes.[33]

Number of persons and households in shelters, by date:

DatePersons(approx.)Households (approx.)
Sunday 31 August[34] 1,010470
1 September[35] [36] 950 450
2 September[37] 880410
3 September[38] 810390
4 September[39] 970460
5 September[40] 800390
6 September[41] 690350
7 September[42] 660340
8 September[43] 660330
9 September[44] 630320
10 September[45] 11070
11 September[46] 10060
12 September[47] 10060
13 September[48] 8050
14 September[49] 10050
15 September[50] 10050
16 September[51] 7050
17 September[52] 8040
18 September[53] 8050
19 September[54] 8040
20 September8040
21 September8040
22 September7040
23 September8040
24 September9050
25 September270140
26 September8040
27 September7030
28 September5030
29 September5030
30 September5030
1 October5030
2 October5030
3 October6030
4 October5030
5 October5020
6 October8040
7 October4030
8 October3020
9 October4020
10 October4020
11 October4020
12 October3020
13 October5030
14 October7040
15 October4020
16 October3020
17 October4020
18 October4020
19 October3020
20 October3020
21 October3020
22 October3020
23 October3020
24 October3010
25 October2010
26 October2010
27 October2010
28 October2010
29 October2010
30 October2010
31 October2010
1 November2010
2 November1010
3 November1010
4 November1010
5 November1010
6 November1010
7 November1010
8 November1010
9 November1010
10 November1010
11 November1010
12 November1010
13 November1010
14 November1010
15 November1010
16 November1010
17 November1010
18 November1010
19 November1010
20 November104
21 November103
22 November103
23 November103
24 November103
25 November103
26 November103
27 November103
28 November103
29 November102
30 November102
1 December102
2 December102
3 December102
4 December31
5 December31
6 December31
7 December31
8 December31
9 December31
10 December31
11 December31
12 December31
13 December31
14 December31
15 December31
16 December31
17 December21
18 December21
19 December21
20 December21
21 December21
22 December21
23 December21
24 December21
25 December21

Prime Minister Shinzo Abe planned to visit the disaster area on the morning of 24 August, but bad weather postponed his visit by one day.[55]

The Emperor and Empress visited Hiroshima 3 December, and observed damage and met survivors, SDF personnel, firefighters, police and volunteers.[56]

5 September Cabinet of Japan meeting estimated that 900 million yen is needed for Hiroshima's recovery. (The valuation of the damage caused by the landslide is incomplete.)[57]

Hiroshima prefectural and municipal governments decided to provide 157 public housing units, for evacuees, free of charge. Officials were forced to hold a lottery after 284 households applied. Local governments are also preparing to build temporary housing for those who lost their homes.[58] The procedures will begin on 28 August, which is also the earliest day tenants can move in.[59] According to the city, municipal housing is provided rent-free for up to a maximum six-month stay, as a general rule.[60]

On 2 September, officials issued a new evacuation advisory to parts of Asaminami-ku, fearing that a nearby slope might collapse and cause more damage. This affected around 2,520 persons(about 980 households).[61]

Voluntarily evacuation order was issued 24 September to districts of Asakita and Asaminami-ku because Typhoon 16.[62] At next day, part of it was cancelled.[63]

On 1 October and further 7 October and 17th, evacuation advisories were cancelled for several parts of area.[64] [65] [66]

On 20 November, last evacuation advisory was cancelled and 42 people (16 households) were able to return to their homes.[67]

The last shelter was closed 25 December.[68]

See also

External links

Notes and References

  1. Web site: 「平成26年8月20日の豪雨災害」への対応について（12月26日9時現在）. Hiroshima City. 26 December 2014. 26 December 2014. https://web.archive.org/web/20141226093848/http://www.city.hiroshima.lg.jp/www/contents/0000000000000/1408505551506/files/gouusaigai.pdf. 26 December 2014. dead.
  2. Wang . Fawu . Wu . Ying-Hsin . Yang . Hufeng . Tanida . Yuta . Kamei . Atsushi . 2015-07-24 . Preliminary investigation of the 20 August 2014 debris flows triggered by a severe rainstorm in Hiroshima City, Japan . Geoenvironmental Disasters . 2 . 1 . 17 . 10.1186/s40677-015-0025-6 . 55239799 . 2197-8670. free .
  3. Web site: 日本地質学会 – 2014年8月20日広島における土砂災害，特に地質要因（2014.9.2） . 2022-12-03 . geosociety.jp.
  4. Web site: 20 August 2014 . Japan landslides kill 32 in Hiroshima prefecture . 20 August 2014 . BBC News.
  5. News: Hanai . Toru . 20 August 2014 . Landslides hit Japan's Hiroshima, killing at least 36 . Reuters . 21 August 2014.
  6. Tsuchida . Takashi . Moriwaki . Takeo . Nakai . Shinji . Athapaththu . A. M. R. G. . 2019-08-01 . Investigation and consideration on landslide zoning of multiple slope failures and debris flows of 2014 disaster in Hiroshima, Japan . Soils and Foundations . en . 59 . 4 . 1085–1102 . 10.1016/j.sandf.2018.12.012 . 135386139 . 0038-0806. free .
  7. News: 21 August 2014 . Hiroshima slide alert said tardy; toll hits 39 as search for missing seven continues . . 21 August 2014.
  8. Web site: Japan landslide: Death toll rises to 39 in Hiroshima . BBC News. 22 August 2014 . 22 August 2014.
  9. Web site: 広島土砂災害の死者４１人に 不明４７人、捜索は難航. . 23 August 2014 . 22 August 2014.
  10. Web site: 死者４２人に＝広島県警 . Jiji Press . 23 August 2014 . 23 August 2014 . 26 August 2014 . https://web.archive.org/web/20140826115659/http://www.jiji.com/jc/c?g=soc_30&k=2014082300121 . dead .
  11. Web site: 広島 １人の遺体発見 不明者か . NHK . 9 September 2014 . 9 September 2014 . https://web.archive.org/web/20140910195817/http://www3.nhk.or.jp/news/html/20140909/t10014461271000.html . 10 September 2014 . dead .
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  19. Web site: 土砂災害被災地で犠牲者の法要 . NHK . 23 September 2014 . 23 September 2014 . https://web.archive.org/web/20140924095818/http://www3.nhk.or.jp/news/html/20140923/k10014810791000.html . 24 September 2014 . dead.
  20. Web site: 広島土砂災害 犠牲者の四十九日法要 . NHK . 28 September 2014 . 28 September 2014 . https://web.archive.org/web/20140929064308/http://www3.nhk.or.jp/news/html/20140928/k10014941821000.html . 29 September 2014 . dead .
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  23. Web site: ＜広島土砂災害＞日赤県支部が救護班派遣 . Yomiuri online . 25 August 2014. 25 August 2014.
  24. Web site: 広島の土砂災害に「災害救助犬」－神石高原町のNPOが派遣 ／広島 . Yahoo . . 21 August 2014 . 22 August 2014 . https://web.archive.org/web/20140823140304/http://headlines.yahoo.co.jp/hl?a=20140821-00000058-minkei-l34 . 23 August 2014 . dead.
  25. Web site: 広島土砂災害の死者５０人に、捜索活動再開 . Tokyo Broadcasting System . 24 August 2014 . 24 August 2014 . https://archive.today/20140824034836/http://news.tbs.co.jp/newseye/tbs_newseye2281922.html . 24 August 2014 . dead.
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  28. Web site: 捜索阻む降雨・土砂 広島土砂災害、死者５０人・不明３８人 . The Chugoku Shimbun. 25 August 2014. 24 August 2014.
  29. Web site: 土砂災害 死者４９人不明のおそれ４１人 . NHK . 23 August 2014 . 23 August 2014 . https://web.archive.org/web/20140823140300/http://www3.nhk.or.jp/news/html/20140823/t10014030241000.html . 23 August 2014 . dead.
  30. Web site: クローズアップ２０１４:広島土砂災害、７２時間経過 捜索阻む「壁」 . Mainichi newspapers . 24 August 2014 . 23 August 2014 . https://archive.today/20140823193754/http://mainichi.jp/shimen/news/20140824ddm003040052000c.html . 23 August 2014 . dead.
  31. Web site: 広島）避難所の４小学校、授業開始を延期. The Asahi Shimbun . 26 August 2014. 25 August 2014.
  32. Web site: 広島土砂災害 小学校の避難所 すべて閉鎖. NHK. 1 November 2014. 1 November 2014. https://web.archive.org/web/20141102001011/http://www3.nhk.or.jp/news/html/20141101/k10015881751000.html. 2 November 2014. dead.
  33. News: Officials in Hiroshima lift evacuation advisories in mudslide-hit city. . 31 August 2014 . 31 August 2014.
  34. Web site: ８月１９日（火）からの大雨による被害等について（第３７報） . . 31 August 2014 . 31 August 2014 . https://web.archive.org/web/20140903095803/http://www.bousai.pref.hiroshima.jp/hdis/info/1589/notice_1589_1.pdf . 3 September 2014 . dead.
  35. News: Hiroshima schools used as evacuation centers resume classes after mudslides. The Japan Times. 1 September 2014. 1 September 2014.
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  61. Web site: ８月１９日（火）からの大雨による被害等について（第41報） . . 2 September 2014 . 3 September 2014 . https://web.archive.org/web/20141006082048/http://www.bousai.pref.hiroshima.jp/hdis/info/1606/notice_1606_1.pdf . 6 October 2014 . dead.
  62. Web site: 広島市が大雨に備え避難準備情報 . NHK . 24 September 2014 . 24 September 2014 . https://archive.today/20140924112646/http://www3.nhk.or.jp/news/html/20140924/k10014846321000.html . 24 September 2014 . dead.
  63. Web site: 広島市安佐南区の避難勧告 一部解除. NHK. 25 September 2014. 25 September 2014. https://web.archive.org/web/20140925223606/http://www3.nhk.or.jp/news/html/20140925/k10014870511000.html. 25 September 2014. dead.
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  65. Web site: 広島の土砂災害 避難勧告の半数を解除. NHK. 7 October 2014. 7 October 2014. https://web.archive.org/web/20141008120630/http://www3.nhk.or.jp/news/html/20141007/k10015201811000.html. 8 October 2014. dead.
  66. Web site: 広島土砂災害 避難勧告の大半を解除. NHK. 17 October 2014. 17 October 2014. https://web.archive.org/web/20141018064149/http://www3.nhk.or.jp/news/html/20141017/k10015481891000.html. 18 October 2014. dead.
  67. Web site: 広島 土砂災害の避難勧告 すべて解除. NHK. 20 November 2014. 20 November 2014. https://archive.today/20141120110208/http://www3.nhk.or.jp/news/html/20141120/k10013361741000.html. 20 November 2014. dead.
  68. Web site: 広島 土砂災害の避難所すべて閉鎖. NHK. 25 December 2014. 25 December 2014. https://web.archive.org/web/20141225190555/http://www3.nhk.or.jp/news/html/20141225/k10014282391000.html. 25 December 2014. dead.

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