29日現在、全国の31の活火山で噴火警戒レベルが設定されているが、このうち火山活動が顕著で登山規制が施行されているレベル2以上の山は、御嶽山を含めて8つある。以下、スライドショーで紹介しよう。
噴火警戒レベルが高い8つの火山【2014/09/29】
(01 of08)
口永良部島（くちのえらぶじま、鹿児島県）\n\n【噴火警戒レベル3】（入山規制）\n居住地域の近くまで重大な影響を及ぼす噴火が発生､あるいは発生が予想される｡（気象庁のリーフレット\n\n2014年8月3日、口永良部島の新岳（しんだけ）が噴火し、噴煙が800メートル以上に達した。 (credit:tsuda/Flickr)
(02 of08)
桜島（鹿児島県）\n\n【噴火警戒レベル3】（入山規制）\n居住地域の近くまで重大な影響を及ぼす噴火が発生､あるいは発生が予想される｡（気象庁のリーフレット）\n\n8月31日に爆発的噴火が相次ぎ、噴煙の高さは3000mに達した。 (credit:JTB Photo via Getty Images)
(03 of08)
御嶽山（長野・岐阜県）\n\n【噴火警戒レベル3】（入山規制）\n居住地域の近くまで重大な影響を及ぼす噴火が発生､あるいは発生が予想される｡（気象庁のリーフレット）\n\n (Photo credit should read MINISTRY OF LAND, INFRASTRUCTURE/AFP/Getty Images) (credit:AFP via Getty Images)
(04 of08)
草津白根山（群馬県）\n\n【噴火警戒レベル2（火口周辺規制）】\n火口周辺約1km以内に噴石が飛散するなどの影響を及ぼす噴火が発生､または発生すると予想｡（気象庁のリーフレット） (credit:JTB Photo via Getty Images)
(05 of08)
三宅島（東京都）\n\n【噴火警戒レベル2（火口周辺規制）】\n火口周辺約1km以内に噴石が飛散するなどの影響を及ぼす噴火が発生､または発生すると予想｡（気象庁のリーフレット） (credit:mamacharikinoko/Flickr)
(06 of08)
阿蘇山（熊本県）\n\n【噴火警戒レベル2（火口周辺規制）】\n火口周辺約1km以内に噴石が飛散するなどの影響を及ぼす噴火が発生､または発生すると予想｡（気象庁のリーフレット） (credit:JTB Photo via Getty Images)
(07 of08)
霧島山の新燃岳（鹿児島県）\n\n噴火警戒レベル2（火口周辺規制）\n火口周辺約1km以内に噴石が飛散するなどの影響を及ぼす噴火が発生､または発生すると予想｡（気象庁のリーフレット）\n\n2011年1月に噴火し、宮崎県高原町で避難勧告。その後、土石流に備え、同県都城市でも避難勧告が発令された。（写真は当時）\n\nAFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
(08 of08)
諏訪之瀬島（鹿児島県）\n\n【噴火警戒レベル2（火口周辺規制）】\n火口周辺約1km以内に噴石が飛散するなどの影響を及ぼす噴火が発生､または発生すると予想｡（気象庁のリーフレット） (credit:tsuda/Flickr)
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御嶽山 噴火
御嶽山／霧に包まれた登山道入り口付近 (01 of68)
霧に包まれた御嶽山の登山道入り口付近。悪天候のため捜索活動は中止された＝2014年10月03日午前、長野県王滝村 (credit:時事通信社)
御嶽山／大型ヘリと御嶽山(02 of68)
御嶽山（奥）で救助活動が再開され、捜索活動に向かう隊員を乗せた自衛隊の大型ヘリコプター＝１日午前８時３分、長野県王滝村\n\n撮影日：2014年10月01日 (credit:時事通信社)
(03 of68)
御嶽頂上山荘に到着した救助隊＝２８日午前１１時５１分、御嶽山上空［時事通信社ヘリより］\n (credit:時事通信社)
(04 of68)
御嶽山に降り、救助に向かう陸上自衛隊員＝２９日午前［防衛省統合幕僚監部提供］ (credit:時事通信社)
(05 of68)
御嶽山が噴火し、灰で覆われた御嶽剣ケ峰山荘と飛行する自衛隊のヘリコプター＝２８日午前１１時３７分、御嶽山上空［時事通信社ヘリより］ (credit:時事通信社)
(06 of68)
負傷者を担架搬送し御嶽山を下る陸上自衛隊の隊員ら＝２８日［防衛省統合幕僚監部提供］ (credit:時事通信社)
(07 of68)
御嶽山噴火で救助活動に向かう自衛隊の車両＝２８日午後、長野県王滝村 (credit:時事通信社)
(08 of68)
御嶽山噴火で救助活動に向かう自衛隊の車両＝２８日午後、長野県王滝村 (credit:時事通信社)
JAPAN-VOLCANO(09 of68)
A military helicopter leaves a temporary landing site for a resque mission on Mount Ontake in Otaki, Nagano prefecture on September 29, 2014. Japanese rescuers Spetember 29 resumed a grim operation to recover more bodies after 31 people were believed killed in a volcanic eruption, as survivors told of seeing hikers die when tonnes of ash and rocks thundered from the sky. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
JAPAN-VOLCANO(10 of68)
A cloud of volcanis ash rise from Mount Ontake seen from Gifu prefecture on September 28, 2014. More 30 hikers were found in \'cardiac arrest\' near the peak of the erupting volcano in Japan police said. The eruption of the 3,067-metre (10,121-foot) Mount Ontake happened around midday, the meteorological agency said. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
JAPAN-VOLCANO(11 of68)
This handout picture taken by Ministry of Land, Infrastructure and Transport Chubu Regional Development Bureau on September 27, 2014 shows white smoke rising from Mount Ontake as Japan\'s volcano Ontake erupts in Nagano prefecture, central Japan. Dozens of hikers were stranded on the slopes of an erupting Japanese volcano that has reportedly killed one person and left 30 more seriously injured. The eruption of the 3,067-metre Mount Ontake straddling Nagano and Gifu prefecture happened around midday. AFP PHOTO / MINISTRY OF LAND, INFRASTRUCTURE AND TRANSPORT CHUBU REGIONAL DEVELOPMENT BUREAU via JIJI PRESS ---EDITORS NOTE---HANDOUT RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT \'AFP PHOTO / MINISTRY OF LAND, INFRASTRUCTURE AND TRANSPORT CHUBU REGIONAL DEVELOPMENT BUREAU via JIJI PRESS\' - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS JAPAN OUT (Photo credit should read MINISTRY OF LAND, INFRASTRUCTURE/AFP/Getty Images) (credit:AFP via Getty Images)
JAPAN-VOLCANO(12 of68)
This picture shows a smoke rising from Mount Ontake in Nagano prefecture on September 28, 2014. The volcano erupted in central Japan on September 27, shooting ash and rocks into the air that reportedly left eight hikers injured and forced 150 people to shelter in cabins near the summit. The eruption of the 3,067-metre (10,121-foot) Mount Ontake happened around midday, the meteorological agency said. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
JAPAN-VOLCANO(13 of68)
This picture shows a smoke rising from Mount Ontake in Nagano prefecture on September 28, 2014. The volcano erupted in central Japan on September 27, shooting ash and rocks into the air that reportedly left eight hikers injured and forced 150 people to shelter in cabins near the summit. The eruption of the 3,067-metre (10,121-foot) Mount Ontake happened around midday, the meteorological agency said. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
JAPAN-VOLCANO(14 of68)
Smoke rises from mount Ontake in Nagano prefecture on September 29, 2014. Japanese rescuers September 29 resumed a grim operation to recover more bodies after 31 people were believed killed in a volcanic eruption, as survivors told of seeing hikers die when tonnes of ash and rocks thundered from the sky. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
Rescue Work Continues After Mount Ontake Eruption In Japan(15 of68)
OTAKI, JAPAN - SEPTEMBER 28: Rescue workers load a injured hiker into a rescue helicopter at Kiso hospital on September 28, 2014 in Otaki, Japan. The eruption of Mt. Ontake injured at least 32 people, and more than 250 hikers are still left stranded near the peak. (Photo by Ken Ishii/Getty Images) (credit:Ken Ishii via Getty Images)
JAPAN-VOLCANO(16 of68)
A vehicle (back) loaded with dead bodies, that were retrieved by helicopter from the summit of the Mount Ontake, leaves a park in Otaki village, Nagano prefecture on September 29, 2014. Firefighters, police and troops resumed search operations on a volcano in central Japan after four confirmed fatalities with at least 27 other people feared dead. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
JAPAN-VOLCANO(17 of68)
A vehicle loaded with dead bodies, that were retrieved by helicopter from the summit of the Mount Ontake, leaves a park in Otaki village, Nagano prefecture on September 29, 2014. Firefighters, police and troops resumed search operations on a volcano in central Japan after four confirmed fatalities with at least 27 other people feared dead. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
JAPAN-VOLCANO(18 of68)
A vehicle (back) loaded with dead bodies, that were retrieved by helicopter from the summit of the Mount Ontake, leaves a park in Otaki village, Nagano prefecture on September 29, 2014. Firefighters, police and troops resumed search operations on a volcano in central Japan after four confirmed fatalities with at least 27 other people feared dead. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
JAPAN-VOLCANO(19 of68)
Bereaved parties leave a morgue, where enshrined dead bodies rest, following the volcanic eruption on Mount Ontake in Kiso, Nagano prefecture on September 29, 2014. Japanese rescuers Spetember 29 resumed a grim operation to recover more bodies after 31 people were believed killed in a volcanic eruption, as survivors told of seeing hikers die when tonnes of ash and rocks thundered from the sky. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
JAPAN-VOLCANO(20 of68)
Bereaved parties arrive at a morgue, where enshrined dead bodies rest, following the volcanic eruption on Mount Ontake in Kiso, Nagano prefecture on September 29, 2014. Japanese rescuers Spetember 29 resumed a grim operation to recover more bodies after 31 people were believed killed in a volcanic eruption, as survivors told of seeing hikers die when tonnes of ash and rocks thundered from the sky. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
JAPAN-VOLCANO(21 of68)
Employees of a farm remove volcanic ash covering a vegetable field in Miyakonojo, Miyazaki prefecture on February 8, 2011 following the eruption of nearby Mount Shinmoedake volcano in the Kirishima range. Authorities on February 1 widened the danger zone around the 1,421-metre (4,689-feet) Shinmoedake volcano in the Kirishima range, with its first major eruption for 52 years having sent columns of smoke and ash into the sky. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
JAPAN-VOLCANO(22 of68)
A Japanese farmer inspects his cabbages covered with volcanic ash at a vegetable filed in Miyakonojo city in Miyazaki prefecture, Japan\'s southern island of Kyushu on February 4, 2011. A series of eruptions from a volcano Shinmoedake in southern Japnan fired columns of ash and smoke thousands of metres. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
JAPAN-VOLCANO(23 of68)
Workers remove volcanic ash scattered by Mount Shinmoedake from a sidewalk in the town of Takaharu, in Miyazaki prefecture on Japan\'s southern island of Kyushu on February 5, 2011. Residents of the town have been forced to evacuate and take shelter in school halls and community centres following the eruption at the Shinmoedake volcano in the Kirishima range. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
JAPAN-VOLCANO(24 of68)
An ambulance passes by reporters covering the eruption at Mount Ontake in Nagano prefecture on September 29, 2014. Firefighters, police and troops resumed search operations on a volcano in central Japan after four confirmed fatalities with at least 27 other people feared dead. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
JAPAN-VOLCANO(25 of68)
Rescue teams climb the ridge of a mountain covered with volcanic ash from Mount Ontake in Nagano prefecture on September 29, 2014. Firefighters, police and troops resumed search operations on a volcano in central Japan after four confirmed fatalities with at least 27 other people feared dead. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
JAPAN-VOLCANO(26 of68)
Rescue teams climb the ridge of a mountain covered with volcanic ash from Mount Ontake in Nagano prefecture on September 29, 2014. Firefighters, police and troops resumed search operations on a volcano in central Japan after four confirmed fatalities with at least 27 other people feared dead. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
Rescue Work Continues After Mount Ontake Eruption In Japan(27 of68)
OTAKI, JAPAN - SEPTEMBER 28: Japan Ground Self-Defence Force\'s personnel tanks are seen as they prepare to search hikers at Mt. Ontake on September 28, 2014 in Otaki, Japan. The eruption of Mt. Ontake injured at least 32 people, and more than 250 hikers are still left stranded near the peak. (Photo by Ken Ishii/Getty Images) (credit:Ken Ishii via Getty Images)
Rescue Work Continues After Mount Ontake Eruption In Japan(28 of68)
OTAKI, JAPAN - SEPTEMBER 28: Japan Ground Self-Defence Force\'s personnel tanks are seen as they prepare to search hikers at Mt. Ontake on September 28, 2014 in Otaki, Japan. The eruption of Mt. Ontake injured at least 32 people, and more than 250 hikers are still left stranded near the peak. (Photo by Ken Ishii/Getty Images) (credit:Ken Ishii via Getty Images)
JAPAN-VOLCANO(29 of68)
Smoke rises from Mount Ontake in Nagano prefecture on September 29, 2014. Firefighters, police and troops resumed search operations on a volcano in central Japan after four confirmed fatalities with at least 27 other people feared dead. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
Rescue Work Continues After Mount Ontake Eruption In Japan(30 of68)
OTAKI, JAPAN - SEPTEMBER 28: A rescue helicopter, loaded a injured hiker, lift off from Kiso hospital on September 28, 2014 in Otaki, Japan. The eruption of Mt. Ontake injured at least 32 people, and more than 250 hikers are still left stranded near the peak. (Photo by Ken Ishii/Getty Images) (credit:Ken Ishii via Getty Images)
Rescue Work Continues After Mount Ontake Eruption In Japan(31 of68)
OTAKI, JAPAN - SEPTEMBER 28: Mt. Ontake spews volcanic ash as a Japan Ground Self-Defence Force\'s helicopter rescues hikers on September 28, 2014 in Otaki, Japan. The eruption of Mt. Ontake injured at least 32 people, and more than 250 hikers are still left stranded near the peak. (Photo by Ken Ishii/Getty Images) (credit:Ken Ishii via Getty Images)
JAPAN-VOLCANO(32 of68)
Helicopters rescue a stranded hiker from the top of Mount Ontake in Nagano prefecture on September 28, 2014. The volcano erupted in central Japan on September 27, shooting ash and rocks into the air that reportedly left eight hikers injured and forced 150 people to shelter in cabins near the summit. T he eruption of the 3,067-metre (10,121-feet) Mount Ontake happened around midday, the meteorological agency said. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
JAPAN-VOLCANO(33 of68)
This picture shows a helicopter flying over mountain hut covered in volcanic ash from Nagano prefecture on September 28, 2014. The volcano erupted in central Japan on September 27, shooting ash and rocks into the air that reportedly left eight hikers injured and forced 150 people to shelter in cabins near the summit. The eruption of the 3,067-metre (10,121-foot) Mount Ontake happened around midday, the meteorological agency said. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
JAPAN-VOLCANO(34 of68)
This picture shows a helicopter (top-R) flying over mountain hut covered in volcanic ash from Nagano prefecture on September 28, 2014. The volcano erupted in central Japan on September 27, shooting ash and rocks into the air that reportedly left eight hikers injured and forced 150 people to shelter in cabins near the summit. The eruption of the 3,067-metre (10,121-foot) Mount Ontake happened around midday, the meteorological agency said. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
JAPAN-VOLCANO(35 of68)
This picture shows smoke rising from Mount Ontake and the hills covered with volcanic ash in Nagano prefecture on September 28, 2014. The volcano erupted in central Japan on September 27, shooting ash and rocks into the air that reportedly left eight hikers injured and forced 150 people to shelter in cabins near the summit. The eruption of the 3,067-metre (10,121-foot) Mount Ontake happened around midday, the meteorological agency said. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
JAPAN-VOLCANO(36 of68)
This picture shows smoke rising from Mount Ontake in Nagano prefecture on September 28, 2014. The volcano erupted in central Japan on September 27, shooting ash and rocks into the air that reportedly left eight hikers injured and forced 150 people to shelter in cabins near the summit. The eruption of the 3,067-metre (10,121-foot) Mount Ontake happened around midday, the meteorological agency said. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
JAPAN-VOLCANO(37 of68)
Photographers gather at the foot of the Mount Ontake in Nagano prefecture on September 28, 2014. The volcano erupted in central Japan on September 27, shooting ash and rocks into the air that reportedly left eight hikers injured and forced 150 people to shelter in cabins near the summit. The eruption of the 3,067-metre (10,121-foot) Mount Ontake happened around midday, the meteorological agency said. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
JAPAN-VOLCANO(38 of68)
A policeman stands guard at the entrance of a raod leading to the mountain trail of Mount Ontake in Nagano prefecture on September 28, 2014. The volcano erupted in central Japan on September 27, shooting ash and rocks into the air that reportedly left eight hikers injured and forced 150 people to shelter in cabins near the summit. The eruption of the 3,067-metre (10,121-foot) Mount Ontake happened around midday, the meteorological agency said. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
JAPAN-VOLCANO(39 of68)
Fire department vehicles enter a road leading to the mountain trail of Mount Ontake in Nagano prefecture on September 28, 2014. The volcano erupted in central Japan on September 27, shooting ash and rocks into the air that reportedly left eight hikers injured and forced 150 people to shelter in cabins near the summit. The eruption of the 3,067-metre (10,121-foot) Mount Ontake happened around midday, the meteorological agency said. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
JAPAN-VOLCANO(40 of68)
Fire department vehicles enter a road leading to the mountain trail of Mount Ontake in Nagano prefecture on September 28, 2014. The volcano erupted in central Japan on September 27, shooting ash and rocks into the air that reportedly left eight hikers injured and forced 150 people to shelter in cabins near the summit. The eruption of the 3,067-metre (10,121-foot) Mount Ontake happened around midday, the meteorological agency said. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
Rescue Work Continues After Mount Ontake Eruption In Japan(41 of68)
OTAKI, JAPAN - SEPTEMBER 28: Mt. Ontake spews volcanic ash as search and rescue team workers moves to Mt. Ontake on September 28, 2014 in Otaki, Japan. The eruption of Mt. Ontake injured at least 32 people, and more than 250 hikers are still left stranded near the peak. (Photo by Ken Ishii/Getty Images) (credit:Ken Ishii via Getty Images)
Rescue Work Continues After Mount Ontake Eruption In Japan(42 of68)
OTAKI, JAPAN - SEPTEMBER 28: Mt. Ontake spews volcanic ash on September 28, 2014 in Otaki, Japan. The eruption of Mt. Ontake injured at least 32 people, and more than 250 hikers are still left stranded near the peak. (Photo by Ken Ishii/Getty Images) (credit:Ken Ishii via Getty Images)
Rescue Work Continues After Mount Ontake Eruption In Japan(43 of68)
OTAKI, JAPAN - SEPTEMBER 28: Mt. Ontake spews volcanic ash on September 28, 2014 in Otaki, Japan. The eruption of Mt. Ontake injured at least 32 people, and more than 250 hikers are still left stranded near the peak. (Photo by Ken Ishii/Getty Images) (credit:Ken Ishii via Getty Images)
Rescue Work Continues After Mount Ontake Eruption In Japan(44 of68)
OTAKI, JAPAN - SEPTEMBER 28: Mt. Ontake spews volcanic ash on September 28, 2014 in Otaki, Japan. The eruption of Mt. Ontake injured at least 32 people, and more than 250 hikers are still left stranded near the peak. (Photo by Ken Ishii/Getty Images) (credit:Ken Ishii via Getty Images)
JAPAN-VOLCANO(45 of68)
This picture shows a smoke rising from Mount Ontake in Nagano prefecture on September 28, 2014. The volcano erupted in central Japan on September 27, shooting ash and rocks into the air that reportedly left eight hikers injured and forced 150 people to shelter in cabins near the summit. The eruption of the 3,067-metre (10,121-foot) Mount Ontake happened around midday, the meteorological agency said. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
JAPAN-VOLCANO(46 of68)
This picture shows a smoke rising from Mount Ontake in Nagano prefecture on September 28, 2014. The volcano erupted in central Japan on September 27, shooting ash and rocks into the air that reportedly left eight hikers injured and forced 150 people to shelter in cabins near the summit. The eruption of the 3,067-metre (10,121-foot) Mount Ontake happened around midday, the meteorological agency said. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
JAPAN-VOLCANO(47 of68)
This picture shows a smoke rising from Mount Ontake in Nagano prefecture on September 28, 2014. The volcano erupted in central Japan on September 27, shooting ash and rocks into the air that reportedly left eight hikers injured and forced 150 people to shelter in cabins near the summit. The eruption of the 3,067-metre (10,121-foot) Mount Ontake happened around midday, the meteorological agency said. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
JAPAN-VOLCANO(48 of68)
This picture shows a smoke rising from Mount Ontake in Nagano prefecture on September 28, 2014. The volcano erupted in central Japan on September 27, shooting ash and rocks into the air that reportedly left eight hikers injured and forced 150 people to shelter in cabins near the summit. The eruption of the 3,067-metre (10,121-foot) Mount Ontake happened around midday, the meteorological agency said. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
JAPAN-VOLCANO(49 of68)
This picture shows a smoke rising from Mount Ontake in Nagano prefecture on September 28, 2014. The volcano erupted in central Japan on September 27, shooting ash and rocks into the air that reportedly left eight hikers injured and forced 150 people to shelter in cabins near the summit. The eruption of the 3,067-metre (10,121-foot) Mount Ontake happened around midday, the meteorological agency said. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
JAPAN-VOLCANO(50 of68)
This picture shows a smoke rising from Mount Ontake in Nagano prefecture on September 28, 2014. The volcano erupted in central Japan on September 27, shooting ash and rocks into the air that reportedly left eight hikers injured and forced 150 people to shelter in cabins near the summit. The eruption of the 3,067-metre (10,121-foot) Mount Ontake happened around midday, the meteorological agency said. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
Rescue Work Continues After Mount Ontake Eruption In Japan(51 of68)
OTAKI, JAPAN - SEPTEMBER 28: Mt. Ontake spews volcanic ash on September 28, 2014 in Otaki, Japan. The eruption of Mt. Ontake injured at least 32 people, and more than 250 hikers are still left stranded near the peak. (Photo by Ken Ishii/Getty Images) (credit:Ken Ishii via Getty Images)
Rescue Work Continues After Mount Ontake Eruption In Japan(52 of68)
OTAKI, JAPAN - SEPTEMBER 28: Mt. Ontake spews volcanic ash on September 28, 2014 in Otaki, Japan. The eruption of Mt. Ontake injured at least 32 people, and more than 250 hikers are still left stranded near the peak. (Photo by Ken Ishii/Getty Images) (credit:Ken Ishii via Getty Images)
Rescue Work Continues After Mount Ontake Eruption In Japan(53 of68)
OTAKI, JAPAN - SEPTEMBER 28: Mt. Ontake spews volcanic ash on September 28, 2014 in Otaki, Japan. The eruption of Mt. Ontake injured at least 32 people, and more than 250 hikers are still left stranded near the peak. (Photo by Ken Ishii/Getty Images) (credit:Ken Ishii via Getty Images)
Rescue Work Continues After Mount Ontake Eruption In Japan(54 of68)
OTAKI, JAPAN - SEPTEMBER 28: Mt. Ontake spews volcanic ash on September 28, 2014 in Otaki, Japan. The eruption of Mt. Ontake injured at least 32 people, and more than 250 hikers are still left stranded near the peak. (Photo by Ken Ishii/Getty Images) (credit:Ken Ishii via Getty Images)
Rescue Work Continues After Mount Ontake Eruption In Japan(55 of68)
OTAKI, JAPAN - SEPTEMBER 28: Mt. Ontake spews volcanic ash on September 28, 2014 in Otaki, Japan. The eruption of Mt. Ontake injured at least 32 people, and more than 250 hikers are still left stranded near the peak. (Photo by Ken Ishii/Getty Images) (credit:Ken Ishii via Getty Images)
JAPAN-VOLCANO(56 of68)
An ambulance passes by reporters covering the eruption at Mount Ontake in Nagano prefecture on September 29, 2014. Firefighters, police and troops resumed search operations on a volcano in central Japan after four confirmed fatalities with at least 27 other people feared dead. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
JAPAN-VOLCANO(57 of68)
Rescue teams climb the ridge of a mountain covered with volcanic ash from Mount Ontake in Nagano prefecture on September 29, 2014. Firefighters, police and troops resumed search operations on a volcano in central Japan after four confirmed fatalities with at least 27 other people feared dead. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
JAPAN-VOLCANO(58 of68)
Rescue teams climb the ridge of a mountain covered with volcanic ash from Mount Ontake in Nagano prefecture on September 29, 2014. Firefighters, police and troops resumed search operations on a volcano in central Japan after four confirmed fatalities with at least 27 other people feared dead. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
JAPAN-VOLCANO(59 of68)
A vehicle (back) loaded with dead bodies, that were retrieved by helicopter from the summit of the Mount Ontake, leaves a park in Otaki village, Nagano prefecture on September 29, 2014. Firefighters, police and troops resumed search operations on a volcano in central Japan after four confirmed fatalities with at least 27 other people feared dead. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
JAPAN-VOLCANO(60 of68)
Bereaved parties leave a morgue, where enshrined dead bodies rest, following the volcanic eruption on Mount Ontake in Kiso, Nagano prefecture on September 29, 2014. Japanese rescuers Spetember 29 resumed a grim operation to recover more bodies after 31 people were believed killed in a volcanic eruption, as survivors told of seeing hikers die when tonnes of ash and rocks thundered from the sky. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
JAPAN-VOLCANO(61 of68)
A military helicopter leaves a temporary landing site for a resque mission on Mount Ontake in Otaki, Nagano prefecture on September 29, 2014. Japanese rescuers Spetember 29 resumed a grim operation to recover more bodies after 31 people were believed killed in a volcanic eruption, as survivors told of seeing hikers die when tonnes of ash and rocks thundered from the sky. AFP PHOTO / KAZUHIRO NOGI (Photo credit should read KAZUHIRO NOGI/AFP/Getty Images) (credit:KAZUHIRO NOGI via Getty Images)
Rescue Work Continues After Mount Ontake Eruption In Japan(62 of68)
OTAKI, JAPAN - SEPTEMBER 28: Japan Ground Self-Defence Force\'s personnel tanks are seen as they prepare to search hikers at Mt. Ontake on September 28, 2014 in Otaki, Japan. The eruption of Mt. Ontake injured at least 32 people, and more than 250 hikers are still left stranded near the peak. (Photo by Ken Ishii/Getty Images) (credit:Ken Ishii via Getty Images)
御嶽山／捜索を終えた隊員 (63 of68)
御嶽山での救助・捜索作業を終え、撤収する消防隊員ら＝１日午後３時５６分、長野県王滝村 \n\n撮影日：2014年10月01日 (credit:時事通信社)
御嶽山／捜索活動に向かう隊員 (64 of68)
夜明け前に登山道から捜索活動へ向かう捜索隊員＝１日午前５時１８分、長野県王滝村 \n\n撮影日：2014年10月01日 (credit:時事通信社)
御嶽山／ヘリに乗り込む捜索隊 (65 of68)
救助活動を再開し、捜索のため自衛隊のヘリに乗り込む捜索隊＝１日午前７時２６分、長野県王滝村 \n\n撮影日：2014年10月01日 (credit:時事通信社)
御嶽山／噴火翌日の救助活動 (66 of68)
噴火の翌日、御嶽山の８、９合目付近で救助活動する東京消防庁山岳救助隊＝２８日［東京消防庁提供］ \n\n撮影日：2014年09月28日 (credit:時事通信社)
御嶽山／マスクを着け登校する児童 (67 of68)
御嶽山噴火後、初めての登校日となった長野県王滝村の王滝小中学校では、児童らがマスクやヘルメットを着用して登校した＝３０日午前８時３分 \n\n撮影日：2014年09月30日 (credit:時事通信社)
御嶽山／登山口を進む自衛隊車両 (68 of68)
噴煙が上がる御嶽山への登山口を進む自衛隊車両＝３０日午前５時３０分、長野県王滝村 \n\n撮影日：2014年09月30日 (credit:時事通信社)