Un séisme de magnitude 8,2 a frappé mercredi soir la péninsule d'Alaska et provoqué le déclenchement d'une alerte au tsunami, levée au bout de quelques heures.

Tokyo 2020 stages a giant 10-metre ?MOCCO? puppet performance ahead of the Tokyo 2020 Olympic Games in Tokyo, Japan, July 17, 2021. The puppet was created by children form Japan?s Northeastern region that was devoted by the March 11 earthquake and tsunami in 2011 and is supposed to celebrate the reconstruction effort. REUTERS/Kai Pfaffenbach

Tokyo 2020 stages a giant 10-metre ?MOCCO? puppet performance ahead of the Tokyo 2020 Olympic Games in Tokyo, Japan, July 17, 2021. The puppet was created by children form Japan?s Northeastern region that was devoted by the March 11 earthquake and tsunami in 2011 and is supposed to celebrate the reconstruction effort. REUTERS/Kai Pfaffenbach

Tokyo 2020 President Seiko Hashimoto casts her shadow prior to a giant 10-metre ?MOCCO? puppet performance ahead of the Tokyo 2020 Olympic Games in Tokyo, Japan, July 17, 2021. The puppet was created by children form Japan?s Northeastern region that was devoted by the March 11 earthquake and tsunami in 2011 and is supposed to celebrate the reconstruction effort. REUTERS/Kai Pfaffenbach

Tokyo 2020 stages a giant 10-metre ?MOCCO? puppet performance ahead of the Tokyo 2020 Olympic Games in Tokyo, Japan, July 17, 2021. The puppet was created by children form Japan?s Northeastern region that was devoted by the March 11 earthquake and tsunami in 2011 and is supposed to celebrate the reconstruction effort. REUTERS/Kai Pfaffenbach

Tokyo 2020 stages a giant 10-metre "MOCCO" puppet performance ahead of the Tokyo 2020 Olympic Games in Tokyo, Japan, July 17, 2021. The puppet was created by children from Japan's Northeastern region that was devoted by the March 11 earthquake and tsunami in 2011 and is supposed to celebrate the reconstruction effort. REUTERS/Kai Pfaffenbach TPX IMAGES OF THE DAY

Tokyo 2020 President Seiko Hashimoto delivers her opening speech prior to a giant 10-metre ?MOCCO? puppet performance ahead of the Tokyo 2020 Olympic Games in Tokyo, Japan, July 17, 2021. The puppet was created by children form Japan?s Northeastern region that was devoted by the March 11 earthquake and tsunami in 2011 and is supposed to celebrate the reconstruction effort. REUTERS/Kai Pfaffenbach

Tokyo 2020 stages a giant 10-metre ?MOCCO? puppet performance ahead of the Tokyo 2020 Olympic Games in Tokyo, Japan, July 17, 2021. The puppet was created by children form Japan?s Northeastern region that was devoted by the March 11 earthquake and tsunami in 2011 and is supposed to celebrate the reconstruction effort. REUTERS/Kai Pfaffenbach

Tokyo 2020 President Seiko Hashimoto casts her shadow prior to a giant 10-metre ?MOCCO? puppet performance ahead of the Tokyo 2020 Olympic Games in Tokyo, Japan, July 17, 2021. The puppet was created by children form Japan?s Northeastern region that was devoted by the March 11 earthquake and tsunami in 2011 and is supposed to celebrate the reconstruction effort. REUTERS/Kai Pfaffenbach

Tokyo 2020 stages a giant 10-metre ?MOCCO? puppet performance ahead of the Tokyo 2020 Olympic Games in Tokyo, Japan, July 17, 2021. The puppet was created by children form Japan?s Northeastern region that was devoted by the March 11 earthquake and tsunami in 2011 and is supposed to celebrate the reconstruction effort. REUTERS/Kai Pfaffenbach

Koji Suzuki, 66, a surfer and a surf shop owner, looks on at Karasuzaki beach, around 30 kilometres (20 miles) north of the tsunami-crippled Fukushima Daiichi Nuclear Power Plant, in Minamisoma, Fukushima Prefecture, Japan, April 16, 2021. REUTERS/Akira Tomoshige

Koji Suzuki, 66, a surfer and a surf shop owner, holds his surfboard at Karasuzaki beach, around 30 kilometres (20 miles) north of the tsunami-crippled Fukushima Daiichi Nuclear Power Plant, in Minamisoma, Fukushima Prefecture, Japan, April 16, 2021. REUTERS/Akira Tomoshige

Paper lanterns are lit for the victims of the March 11, 2011 earthquake and tsunami disaster that killed thousands and triggered the worst nuclear accident since Chernobyl, in Tokyo, Japan, March 11, 2021, to mark the10th anniversary of the disaster. REUTERS/Issei Kato

Paper lanterns are lit for the victims of the March 11, 2011 earthquake and tsunami disaster that killed thousands and triggered the worst nuclear accident since Chernobyl, in Tokyo, Japan, March 11, 2021, to mark the10th anniversary of the disaster. REUTERS/Issei Kato TPX IMAGES OF THE DAY

Paper lanterns are lit for the victims of the March 11, 2011 earthquake and tsunami disaster that killed thousands and triggered the worst nuclear accident since Chernobyl, in Tokyo, Japan, March 11, 2021, to mark the10th anniversary of the disaster. REUTERS/Issei Kato

A protester holds a placard during an anti-nuclear rally in front of the headquarters of Tokyo Electric Power Co (TEPCO), the operator of the tsunami-crippled Fukushima Daiichi nuclear plant, on the day marking the 10th anniversary of the disaster, in Tokyo, Japan, March 11, 2021. REUTERS/Issei Kato

Children walk among the candles during the 10th anniversary of the 2011 earthquake and tsunami that killed thousands and triggered the worst nuclear accident since Chernobyl in Futaba, Fukushima prefecture, Japan, March 11, 2021. REUTERS/Kim Kyung-Hoon

Protesters hold a banner during an anti-nuclear rally in front of the headquarters of Tokyo Electric Power Co (TEPCO), the operator of the tsunami-crippled Fukushima Daiichi nuclear plant, on the day marking the 10th anniversary of the disaster, in Tokyo, Japan, March 11, 2021. REUTERS/Issei Kato

People standing near candles watch as fireworks light up the sky to mark the 10th anniversary of the 2011 earthquake and tsunami that killed thousands and triggered the worst nuclear accident since Chernobyl in Futaba, Fukushima prefecture, Japan, March 11, 2021. REUTERS/Kim Kyung-Hoon

People watch as fireworks light up the sky to mark the 10th anniversary of the 2011 earthquake and tsunami that killed thousands and triggered the worst nuclear accident since Chernobyl in Futaba, Fukushima prefecture, Japan, March 11, 2021. REUTERS/Kim Kyung-Hoon

Protesters hold a banner during an anti-nuclear rally in front of the headquarters of Tokyo Electric Power Co (TEPCO), the operator of the tsunami-crippled Fukushima Daiichi nuclear plant, on the day marking the 10th anniversary of the disaster, in Tokyo, Japan, March 11, 2021. REUTERS/Issei Kato

Fireworks light up the sky to mark the 10th anniversary of the 2011 earthquake and tsunami that killed thousands and triggered the worst nuclear accident since Chernobyl in Futaba, Fukushima prefecture, Japan, March 11, 2021. REUTERS/Kim Kyung-Hoon

A child walks among the candles during the 10th anniversary of the 2011 earthquake and tsunami that killed thousands and triggered the worst nuclear accident since Chernobyl in Futaba, Fukushima prefecture, Japan, March 11, 2021. REUTERS/Kim Kyung-Hoon

Protesters hold placards during an anti-nuclear rally in front of the headquarters of Tokyo Electric Power Co (TEPCO), the operator of the tsunami-crippled Fukushima Daiichi nuclear plant, on the day marking the 10th anniversary of the disaster, in Tokyo, Japan, March 11, 2021. REUTERS/Issei Kato

People light up the candles, which read "Memory, connect to future", to mark the 10th anniversary of the 2011 earthquake and tsunami that killed thousands and triggered the worst nuclear accident since Chernobyl in Futaba, Fukushima prefecture, Japan, March 11, 2021. REUTERS/Kim Kyung-Hoon

A protester holds a placard during an anti-nuclear rally in front of the headquarters of Tokyo Electric Power Co (TEPCO), the operator of the tsunami-crippled Fukushima Daiichi nuclear plant, on the day marking the 10th anniversary of the disaster, in Tokyo, Japan, March 11, 2021. REUTERS/Issei Kato

Protesters hold placards during an anti-nuclear rally in front of the headquarters of Tokyo Electric Power Co (TEPCO), the operator of the tsunami-crippled Fukushima Daiichi nuclear plant, on the day marking the 10th anniversary of the disaster, in Tokyo, Japan, March 11, 2021. REUTERS/Issei Kato

Japan's Emperor Naruhito and Empress Masako walk in front of the altar for the victims of the March 11 earthquake and tsunami as they attend the national memorial service on the day marking the 10th anniversary of the disaster, in Tokyo, Japan March 11, 2021. Behrouz Mehri/Pool via REUTERS

Japan's Prime Minister Yoshihide Suga places flowers in front of the altar for the victims of the March 11 earthquake and tsunami during the national memorial service on day marking the 10th anniversary of the disaster, in Tokyo, Japan March 11, 2021. Behrouz Mehri/Pool via REUTERS

Attendees place flowers in front of the altar for the victims of the March 11 earthquake and tsunami during the national memorial service on day marking the 10th anniversary of the disaster, in Tokyo, Japan March 11, 2021. Behrouz Mehri/Pool via REUTERS

Japan's Emperor Naruhito and Empress Masako walk in front of the altar for the victims of the March 11 earthquake and tsunami as they attend the national memorial service on the day marking the 10th anniversary of the disaster, in Tokyo, Japan March 11, 2021. Behrouz Mehri/Pool via REUTERS

Japan's Emperor Naruhito, accompanied by Empress Masako, delivers his speech in front of the altar for the victims of the March 11 earthquake and tsunami as they attend the national memorial service on the day marking the 10th anniversary of the disaster, in Tokyo, Japan March 11, 2021. Behrouz Mehri/Pool via REUTERS

Japan's Emperor Naruhito, accompanied by Empress Masako, delivers his speech in front of the altar for the victims of the March 11 earthquake and tsunami as they attend the national memorial service on the day marking the 10th anniversary of the disaster, in Tokyo, Japan March 11, 2021. Behrouz Mehri/Pool via REUTERS

Japan's Emperor Naruhito and Empress Masako bow in front of the altar for the victims of the March 11 earthquake and tsunami as they attend the national memorial service on the day marking the 10th anniversary of the disaster, in Tokyo, Japan March 11, 2021. Behrouz Mehri/Pool via REUTERS

Japan's Emperor Naruhito and Empress Masako bow in front of the altar for the victims of the March 11 earthquake and tsunami as they attend the national memorial service on the day marking the 10th anniversary of the disaster, in Tokyo, Japan March 11, 2021. Behrouz Mehri/Pool via REUTERS

Japan's Emperor Naruhito and Empress Masako walk in front of the altar for the victims of the March 11 earthquake and tsunami as they attend the national memorial service on the day marking the 10th anniversary of the disaster, in Tokyo, Japan March 11, 2021. Behrouz Mehri/Pool via REUTERS

Attendees bow in front of the altar for the victims of the March 11 earthquake and tsunami during the national memorial service on day marking the 10th anniversary of the disaster, in Tokyo, Japan March 11, 2021. Behrouz Mehri/Pool via REUTERS

Japan's Emperor Naruhito and Empress Masako pay their respects in front of the altar for victims of the March 11 earthquake and tsunami at the national memorial service on day marking the 10th anniversary of the disaster, in Tokyo, Japan March 11, 2021. Behrouz Mehri/Pool via REUTERS

Japan's Emperor Naruhito and Empress Masako listen to the speech of Japan's Prime Minister Yoshihide Suga (C) standing in front of the altar for victims of the March 11 earthquake and tsunami at the national memorial service on day marking the 10th anniversary of the disaster, in Tokyo, Japan March 11, 2021. Behrouz Mehri/Pool via REUTERS

Japan's Emperor Naruhito and Empress Masako bow in front of the altar for victims of the March 11 earthquake and tsunami at the national memorial service on day marking the 10th anniversary of the disaster, in Tokyo, Japan March 11, 2021. Behrouz Mehri/Pool via REUTERS

Japan's Prime Minister Yoshihide Suga (L) bows to Japan's Emperor Naruhito and Empress Masako in front of the altar for victims of the March 11 earthquake and tsunami at the national memorial service on day marking the 10th anniversary of the disaster, in Tokyo, Japan March 11, 2021. Behrouz Mehri/Pool via REUTERS

A passerby and cars are seen at the area which was devastated by the March 11, 2011 earthquake and tsunami in Kesennuma, Miyagi Prefecture, northern Japan March 1, 2021, ahead of the 10th anniversary of the 2011 earthquake and tsunami disaster. Picture taken March 1, 2021. REUTERS/Issei Kato

The area which was devastated by the March 11, 2011 earthquake and tsunami is seen in Ofunato, Iwate Prefecture, northern Japan February 28, 2021, ahead of the 10th anniversary of the 2011 earthquake and tsunami disaster. Picture taken February 28, 2021. REUTERS/Issei Kato

A combination photo shows a man standing in front of a destroyed residential area in Ofunato, Japan, almost two weeks after the area was devastated by a magnitude 9.0 earthquake and tsunami, on March 24, 2011 (top) and the same area pictured on February 28, 2021 (bottom), ahead of the 10th anniversary of the earthquake and tsunami disaster. REUTERS/Issei Kato

A combination photo shows people carry boxes of food given as relief for tsunami victims in front of the Kyotoku-maru fishing trawler in the destroyed residential area of Kesennuma, Miyagi Prefecture, Japan, on March 22, 2011 (top) and the same area pictured on March 1, 2021 (bottom), ahead of the 10th anniversary of the earthquake and tsunami disaster. REUTERS/Issei Kato

Japan's Prime Minister Yoshihide Suga delivers his speech in front of the altar for victims of the March 11 earthquake and tsunami at the national memorial service on the 10th anniversary of the disaster, in Tokyo, Japan March 11, 2021. Behrouz Mehri/Pool via REUTERS

Japan's Prime Minister Yoshihide Suga bows in front of the altar for victims of the March 11 earthquake and tsunami before delivering his speech at the national memorial service on the 10th anniversary of the disaster, in Tokyo, Japan March 11, 2021. Behrouz Mehri/Pool via REUTERS

Japan's Prime Minister Yoshihide Suga bows in front of the altar for victims of the March 11 earthquake and tsunami at the national memorial service on the 10th anniversary of the disaster, in Tokyo, Japan March 11, 2021. Behrouz Mehri/Pool via REUTERS

Japan's Education, Culture, Sports, Science and Technology Minister, Koichi Hagiuda, wearing a face mask, arrives at the National Theatre to attend the national memorial service for the victims of the March 11 earthquake and tsunami, in Tokyo, Japan March 11, 2021. Rodrigo Reyes Marin/Pool via REUTERS

Former Japanese Prime Minister Naoto Kan, wearing a face mask, arrives at the National Theatre to attend the national memorial service for the victims of the March 11 earthquake and tsunami, in Tokyo, Japan March 11, 2021. Rodrigo Reyes Marin/Pool via REUTERS

Japan's Deputy Prime Minister and Finance Minister Taro Aso, wearing a face mask, arrives at the National Theatre to attend the national memorial service for the victims of the March 11 earthquake and tsunami, in Tokyo, Japan March 11, 2021. Rodrigo Reyes Marin/Pool via REUTERS

Japanese Emperor Naruhito, accompanied by Empress Masako, delivers his speech in front of the altar for the victims of the March 11 earthquake and tsunami at the national memorial service on the 10th anniversary of the disaster, in Tokyo, Japan March 11, 2021. Behrouz Mehri/Pool via REUTERS

Japanese Emperor Naruhito and Empress Masako bow in front of the altar for the victims of the March 11 earthquake and tsunami at the national memorial service on the 10th anniversary of the disaster, in Tokyo, Japan March 11, 2021. Behrouz Mehri/Pool via REUTERS

Japanese Emperor Naruhito and Empress Masako, wearing face masks, arrive at the National Theatre to attend the national memorial service for the victims of the March 11 earthquake and tsunami, in Tokyo, Japan March 11, 2021. Rodrigo Reyes Marin/Pool via REUTERS

Former Japanese Prime Minister Shinzo Abe, wearing a face mask, arrives at the National Theatre to attend the national memorial service for the victims of the March 11 earthquake and tsunami, in Tokyo, Japan March 11, 2021. Rodrigo Reyes Marin/Pool via REUTERS

Japan's Prime Minister Yoshihide Suga, wearing a face mask, arrives at the National Theatre to attend the national memorial service for the victims of the March 11 earthquake and tsunami, in Tokyo, Japan March 11, 2021. Rodrigo Reyes Marin/Pool via REUTERS

Japan's Prime Minister Yoshihide Suga, wearing a face mask, wearing face masks, arrives at the National Theatre to attend the national memorial service for the victims of the March 11 earthquake and tsunami, in Tokyo, Japan March 11, 2021. Rodrigo Reyes Marin/Pool via REUTERS

Ryo Kimura, who lost his family members, tosses his daughter, Reni Kimura, in front of a devastated area that was hit by the 2011 tsunami, during its 10th anniversary, in Namie, Fukushima prefecture, Japan March 11, 2021. REUTERS/Kim Kyung-Hoon TPX IMAGES OF THE DAY

Japanese Emperor Naruhito and Empress Masako, wearing face masks, arrive at the National Theatre to attend the national memorial service for the victims of the March 11 earthquake and tsunami, in Tokyo, Japan March 11, 2021. Rodrigo Reyes Marin/Pool via REUTERS