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Event ID: 20260420165303

Off the coast of Sanriku
Time of Quake	Magnitude	Depth
16:52:00 JST 20 Apr 2026	7.5	10

	Aoimori Sanpachikamikita
	Iwate Northern Coast Iwate Northern Inland Iwate Southern Inland Miyagi-North
	Aoimori Tsugaru-North Aoimori Tsugaru-South Aoimori Shimokita Iwate Southern Coast Miyagi-South Miyagi-Central Oshima-East Hidaka-Central Akita Northern Coast Akita Southern Coast Akita Northern Inland Akita Southern Inland Yamagata-Shonai Yamagata-Murayama Fukushima-Nakadori
	Ishikari-North Ishikari-Central Ishikari-South Oshima-West Hiyama Region Sorachi-South Iburi-West Iburi-East Central Hidaka-West Hidaka-East Tokachi-Central Tokachi-South Kushiro-South Central Yamagata-Mogami Yamagata-Okitami Fukushima-Hamadori Fukushima-Aizu Ibaraki-North Ibaraki-South Tochigi-South Gunma-South Saitama-North Saitama-South Chiba-Northwestern Tokyo Tama-East Kanagawa-East Kanagawa-West Niigata-Chuetsu Niigata-Kaetsu Yamanashi East-Fuji 5 Lakes
	Oshima-North Shiribeshi-North Shiribeshi-East Shiribeshi-West Hokkaido Okushiri Island Sorachi-North Sorachi-Central Kamikawa-North Kamikawa-Central Kamikawa-South Rumoi-South Abashiri Kitami Monbetsu Tokachi-North Kushiro-North Nemuro-North Nemuro-Central Nemuro-South Tochigi-North Gunma-North Saitama-Chichibu Chiba-Northeastern Chiba-South Tokyo 23 Wards Niigata-Joetsu Niigata-Sado Yamanashi Central West Ishikawa-Noto Nagano-North Nagano-Central Shizuoka-Izu Shizuoka-East Shizuoka-Central Aichi-West
	Rumoi-North Central Soya-North Hokkaido Rishiri Rebun Tokyo Tama-West Izu Oshima Ishikawa-Kaga Nagano-South Shizuoka-West Toyama-East Toyama-West Gifu Mino Eastern Gifu Mino Midwest Mie-Northern Shiga-South Osaka-North Nara Prefecture

Tsunami Advisory History

Severity	Coastal Area	Local Area	Estimated Arrival Time	Wave Height
16:55:00 JST 20 Apr 2026 - Original tsunami report
Tsunami Alert	Pacific coast of central Hokkaido			3 m
Tsunami Alert	Iwate			3 m
Tsunami Advisory	Eastern part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Western part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Aomori-Pacific coast			1 m
Tsunami Advisory	Miyagi			1 m
Tsunami Advisory	Fukushima			1 m
Slight sea level change	Southern Sea of Japan coast of Hokkaido			0.2 m
Slight sea level change	Aomori-Sea of Japan			0.2 m
Slight sea level change	Mitsuwan			0.2 m
Slight sea level change	Ibaraki			0.2 m
Slight sea level change	Southern Pacific coast of Chiba			0.2 m
Slight sea level change	Izu Islands			0.2 m
16:56:00 JST 20 Apr 2026 - Updated or additional information
Tsunami Alert	Pacific coast of central Hokkaido			3 m
Tsunami Alert	Iwate			3 m
Tsunami Advisory	Eastern part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Western part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Aomori-Pacific coast			1 m
Tsunami Advisory	Miyagi			1 m
Tsunami Advisory	Fukushima			1 m
Slight sea level change	Southern Sea of Japan coast of Hokkaido			0.2 m
Slight sea level change	Aomori-Sea of Japan			0.2 m
Slight sea level change	Mitsuwan			0.2 m
Slight sea level change	Ibaraki			0.2 m
Slight sea level change	Southern Pacific coast of Chiba			0.2 m
Slight sea level change	Izu Islands			0.2 m
17:08:00 JST 20 Apr 2026 - Updated or additional information
Tsunami Alert	Pacific coast of central Hokkaido			3 m
Tsunami Alert	Aomori-Pacific coast			3 m
Tsunami Alert	Iwate			3 m
Tsunami Advisory	Eastern part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Western part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Aomori-Sea of Japan			1 m
Tsunami Advisory	Miyagi			1 m
Tsunami Advisory	Fukushima			1 m
Slight sea level change	Southern Sea of Japan coast of Hokkaido			0.2 m
Slight sea level change	Mitsuwan			0.2 m
Slight sea level change	Ibaraki			0.2 m
Slight sea level change	Southern Pacific coast of Chiba			0.2 m
Slight sea level change	Izu Islands			0.2 m
Slight sea level change	Ogasawara Islands			0.2 m
Slight sea level change	Sagami Bay/Miura Peninsula			0.2 m
Slight sea level change	Tokushima			0.2 m
Slight sea level change	Kochi			0.2 m
17:08:00 JST 20 Apr 2026 - Updated or additional information
Tsunami Alert	Pacific coast of central Hokkaido			3 m
Tsunami Alert	Aomori-Pacific coast			3 m
Tsunami Alert	Iwate			3 m
Tsunami Advisory	Eastern part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Western part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Aomori-Sea of Japan			1 m
Tsunami Advisory	Miyagi			1 m
Tsunami Advisory	Fukushima			1 m
Slight sea level change	Southern Sea of Japan coast of Hokkaido			0.2 m
Slight sea level change	Mitsuwan			0.2 m
Slight sea level change	Ibaraki			0.2 m
Slight sea level change	Southern Pacific coast of Chiba			0.2 m
Slight sea level change	Izu Islands			0.2 m
Slight sea level change	Ogasawara Islands			0.2 m
Slight sea level change	Sagami Bay/Miura Peninsula			0.2 m
Slight sea level change	Tokushima			0.2 m
Slight sea level change	Kochi			0.2 m
17:25:00 JST 20 Apr 2026 - Updated or additional information
Tsunami Alert	Pacific coast of central Hokkaido			3 m
Tsunami Alert	Aomori-Pacific coast			3 m
Tsunami Alert	Iwate			3 m
Tsunami Advisory	Eastern part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Western part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Aomori-Sea of Japan			1 m
Tsunami Advisory	Miyagi			1 m
Tsunami Advisory	Fukushima			1 m
Slight sea level change	Southern Sea of Japan coast of Hokkaido			0.2 m
Slight sea level change	Mitsuwan			0.2 m
Slight sea level change	Ibaraki			0.2 m
Slight sea level change	Southern Pacific coast of Chiba			0.2 m
Slight sea level change	Izu Islands			0.2 m
Slight sea level change	Ogasawara Islands			0.2 m
Slight sea level change	Sagami Bay/Miura Peninsula			0.2 m
Slight sea level change	Tokushima			0.2 m
Slight sea level change	Kochi			0.2 m
17:33:00 JST 20 Apr 2026 - Updated or additional information
Tsunami Alert	Pacific coast of central Hokkaido			3 m
Tsunami Alert	Aomori-Pacific coast			3 m
Tsunami Alert	Iwate			3 m
Tsunami Advisory	Eastern part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Western part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Aomori-Sea of Japan			1 m
Tsunami Advisory	Miyagi			1 m
Tsunami Advisory	Fukushima			1 m
Slight sea level change	Southern Sea of Japan coast of Hokkaido			0.2 m
Slight sea level change	Mitsuwan			0.2 m
Slight sea level change	Ibaraki			0.2 m
Slight sea level change	Southern Pacific coast of Chiba			0.2 m
Slight sea level change	Izu Islands			0.2 m
Slight sea level change	Ogasawara Islands			0.2 m
Slight sea level change	Sagami Bay/Miura Peninsula			0.2 m
Slight sea level change	Tokushima			0.2 m
Slight sea level change	Kochi			0.2 m
17:36:00 JST 20 Apr 2026 - Updated or additional information
Tsunami Alert	Pacific coast of central Hokkaido			3 m
Tsunami Alert	Aomori-Pacific coast			3 m
Tsunami Alert	Iwate			3 m
Tsunami Advisory	Eastern part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Western part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Aomori-Sea of Japan			1 m
Tsunami Advisory	Miyagi			1 m
Tsunami Advisory	Fukushima			1 m
Slight sea level change	Southern Sea of Japan coast of Hokkaido			0.2 m
Slight sea level change	Mitsuwan			0.2 m
Slight sea level change	Ibaraki			0.2 m
Slight sea level change	Southern Pacific coast of Chiba			0.2 m
Slight sea level change	Izu Islands			0.2 m
Slight sea level change	Ogasawara Islands			0.2 m
Slight sea level change	Sagami Bay/Miura Peninsula			0.2 m
Slight sea level change	Tokushima			0.2 m
Slight sea level change	Kochi			0.2 m
17:37:00 JST 20 Apr 2026 - Updated or additional information
Tsunami Alert	Pacific coast of central Hokkaido			3 m
Tsunami Alert	Aomori-Pacific coast			3 m
Tsunami Alert	Iwate			3 m
Tsunami Advisory	Eastern part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Western part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Aomori-Sea of Japan			1 m
Tsunami Advisory	Miyagi			1 m
Tsunami Advisory	Fukushima			1 m
Slight sea level change	Southern Sea of Japan coast of Hokkaido			0.2 m
Slight sea level change	Mitsuwan			0.2 m
Slight sea level change	Ibaraki			0.2 m
Slight sea level change	Southern Pacific coast of Chiba			0.2 m
Slight sea level change	Izu Islands			0.2 m
Slight sea level change	Ogasawara Islands			0.2 m
Slight sea level change	Sagami Bay/Miura Peninsula			0.2 m
Slight sea level change	Tokushima			0.2 m
Slight sea level change	Kochi			0.2 m
17:42:00 JST 20 Apr 2026 - Updated or additional information
Tsunami Alert	Pacific coast of central Hokkaido			3 m
Tsunami Alert	Aomori-Pacific coast			3 m
Tsunami Alert	Iwate			3 m
Tsunami Advisory	Eastern part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Western part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Aomori-Sea of Japan			1 m
Tsunami Advisory	Miyagi			1 m
Tsunami Advisory	Fukushima			1 m
Slight sea level change	Southern Sea of Japan coast of Hokkaido			0.2 m
Slight sea level change	Mitsuwan			0.2 m
Slight sea level change	Ibaraki			0.2 m
Slight sea level change	Southern Pacific coast of Chiba			0.2 m
Slight sea level change	Izu Islands			0.2 m
Slight sea level change	Ogasawara Islands			0.2 m
Slight sea level change	Sagami Bay/Miura Peninsula			0.2 m
Slight sea level change	Tokushima			0.2 m
Slight sea level change	Kochi			0.2 m
17:47:00 JST 20 Apr 2026 - Updated or additional information
Tsunami Alert	Pacific coast of central Hokkaido			3 m
Tsunami Alert	Aomori-Pacific coast			3 m
Tsunami Alert	Iwate			3 m
Tsunami Advisory	Eastern part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Western part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Aomori-Sea of Japan			1 m
Tsunami Advisory	Miyagi			1 m
Tsunami Advisory	Fukushima			1 m
Slight sea level change	Southern Sea of Japan coast of Hokkaido			0.2 m
Slight sea level change	Mitsuwan			0.2 m
Slight sea level change	Ibaraki			0.2 m
Slight sea level change	Southern Pacific coast of Chiba			0.2 m
Slight sea level change	Izu Islands			0.2 m
Slight sea level change	Ogasawara Islands			0.2 m
Slight sea level change	Sagami Bay/Miura Peninsula			0.2 m
Slight sea level change	Tokushima			0.2 m
Slight sea level change	Kochi			0.2 m
17:50:00 JST 20 Apr 2026 - Updated or additional information
Tsunami Alert	Pacific coast of central Hokkaido			3 m
Tsunami Alert	Aomori-Pacific coast			3 m
Tsunami Alert	Iwate			3 m
Tsunami Advisory	Eastern part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Western part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Aomori-Sea of Japan			1 m
Tsunami Advisory	Miyagi			1 m
Tsunami Advisory	Fukushima			1 m
Slight sea level change	Southern Sea of Japan coast of Hokkaido			0.2 m
Slight sea level change	Mitsuwan			0.2 m
Slight sea level change	Ibaraki			0.2 m
Slight sea level change	Southern Pacific coast of Chiba			0.2 m
Slight sea level change	Izu Islands			0.2 m
Slight sea level change	Ogasawara Islands			0.2 m
Slight sea level change	Sagami Bay/Miura Peninsula			0.2 m
Slight sea level change	Tokushima			0.2 m
Slight sea level change	Kochi			0.2 m
17:53:00 JST 20 Apr 2026 - Updated or additional information
Tsunami Alert	Pacific coast of central Hokkaido			3 m
Tsunami Alert	Aomori-Pacific coast			3 m
Tsunami Alert	Iwate			3 m
Tsunami Advisory	Eastern part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Western part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Aomori-Sea of Japan			1 m
Tsunami Advisory	Miyagi			1 m
Tsunami Advisory	Fukushima			1 m
Slight sea level change	Southern Sea of Japan coast of Hokkaido			0.2 m
Slight sea level change	Mitsuwan			0.2 m
Slight sea level change	Ibaraki			0.2 m
Slight sea level change	Southern Pacific coast of Chiba			0.2 m
Slight sea level change	Izu Islands			0.2 m
Slight sea level change	Ogasawara Islands			0.2 m
Slight sea level change	Sagami Bay/Miura Peninsula			0.2 m
Slight sea level change	Tokushima			0.2 m
Slight sea level change	Kochi			0.2 m
17:55:00 JST 20 Apr 2026 - Updated or additional information
Tsunami Alert	Pacific coast of central Hokkaido			3 m
Tsunami Alert	Aomori-Pacific coast			3 m
Tsunami Alert	Iwate			3 m
Tsunami Advisory	Eastern part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Western part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Aomori-Sea of Japan			1 m
Tsunami Advisory	Miyagi			1 m
Tsunami Advisory	Fukushima			1 m
Slight sea level change	Southern Sea of Japan coast of Hokkaido			0.2 m
Slight sea level change	Mitsuwan			0.2 m
Slight sea level change	Ibaraki			0.2 m
Slight sea level change	Southern Pacific coast of Chiba			0.2 m
Slight sea level change	Izu Islands			0.2 m
Slight sea level change	Ogasawara Islands			0.2 m
Slight sea level change	Sagami Bay/Miura Peninsula			0.2 m
Slight sea level change	Tokushima			0.2 m
Slight sea level change	Kochi			0.2 m
17:57:00 JST 20 Apr 2026 - Updated or additional information
Tsunami Alert	Pacific coast of central Hokkaido			3 m
Tsunami Alert	Aomori-Pacific coast			3 m
Tsunami Alert	Iwate			3 m
Tsunami Advisory	Eastern part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Western part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Aomori-Sea of Japan			1 m
Tsunami Advisory	Miyagi			1 m
Tsunami Advisory	Fukushima			1 m
Slight sea level change	Southern Sea of Japan coast of Hokkaido			0.2 m
Slight sea level change	Mitsuwan			0.2 m
Slight sea level change	Ibaraki			0.2 m
Slight sea level change	Southern Pacific coast of Chiba			0.2 m
Slight sea level change	Izu Islands			0.2 m
Slight sea level change	Ogasawara Islands			0.2 m
Slight sea level change	Sagami Bay/Miura Peninsula			0.2 m
Slight sea level change	Tokushima			0.2 m
Slight sea level change	Kochi			0.2 m
17:58:00 JST 20 Apr 2026 - Updated or additional information
Tsunami Alert	Pacific coast of central Hokkaido			3 m
Tsunami Alert	Aomori-Pacific coast			3 m
Tsunami Alert	Iwate			3 m
Tsunami Advisory	Eastern part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Western part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Aomori-Sea of Japan			1 m
Tsunami Advisory	Miyagi			1 m
Tsunami Advisory	Fukushima			1 m
Slight sea level change	Southern Sea of Japan coast of Hokkaido			0.2 m
Slight sea level change	Mitsuwan			0.2 m
Slight sea level change	Ibaraki			0.2 m
Slight sea level change	Southern Pacific coast of Chiba			0.2 m
Slight sea level change	Izu Islands			0.2 m
Slight sea level change	Ogasawara Islands			0.2 m
Slight sea level change	Sagami Bay/Miura Peninsula			0.2 m
Slight sea level change	Tokushima			0.2 m
Slight sea level change	Kochi			0.2 m
18:13:00 JST 20 Apr 2026 - Updated or additional information
Tsunami Alert	Pacific coast of central Hokkaido			3 m
Tsunami Alert	Aomori-Pacific coast			3 m
Tsunami Alert	Iwate			3 m
Tsunami Advisory	Eastern part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Western part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Aomori-Sea of Japan			1 m
Tsunami Advisory	Miyagi			1 m
Tsunami Advisory	Fukushima			1 m
Slight sea level change	Southern Sea of Japan coast of Hokkaido			0.2 m
Slight sea level change	Mitsuwan			0.2 m
Slight sea level change	Ibaraki			0.2 m
Slight sea level change	Southern Pacific coast of Chiba			0.2 m
Slight sea level change	Izu Islands			0.2 m
Slight sea level change	Ogasawara Islands			0.2 m
Slight sea level change	Sagami Bay/Miura Peninsula			0.2 m
Slight sea level change	Tokushima			0.2 m
Slight sea level change	Kochi			0.2 m
18:23:00 JST 20 Apr 2026 - Updated or additional information
Tsunami Alert	Pacific coast of central Hokkaido			3 m
Tsunami Alert	Aomori-Pacific coast			3 m
Tsunami Alert	Iwate			3 m
Tsunami Advisory	Eastern part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Western part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Aomori-Sea of Japan			1 m
Tsunami Advisory	Miyagi			1 m
Tsunami Advisory	Fukushima			1 m
Slight sea level change	Southern Sea of Japan coast of Hokkaido			0.2 m
Slight sea level change	Mitsuwan			0.2 m
Slight sea level change	Ibaraki			0.2 m
Slight sea level change	Southern Pacific coast of Chiba			0.2 m
Slight sea level change	Izu Islands			0.2 m
Slight sea level change	Ogasawara Islands			0.2 m
Slight sea level change	Sagami Bay/Miura Peninsula			0.2 m
Slight sea level change	Tokushima			0.2 m
Slight sea level change	Kochi			0.2 m
18:32:00 JST 20 Apr 2026 - Updated or additional information
Tsunami Alert	Pacific coast of central Hokkaido			3 m
Tsunami Alert	Aomori-Pacific coast			3 m
Tsunami Alert	Iwate			3 m
Tsunami Advisory	Eastern part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Western part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Aomori-Sea of Japan			1 m
Tsunami Advisory	Miyagi			1 m
Tsunami Advisory	Fukushima			1 m
Slight sea level change	Southern Sea of Japan coast of Hokkaido			0.2 m
Slight sea level change	Mitsuwan			0.2 m
Slight sea level change	Ibaraki			0.2 m
Slight sea level change	Southern Pacific coast of Chiba			0.2 m
Slight sea level change	Izu Islands			0.2 m
Slight sea level change	Ogasawara Islands			0.2 m
Slight sea level change	Sagami Bay/Miura Peninsula			0.2 m
Slight sea level change	Tokushima			0.2 m
Slight sea level change	Kochi			0.2 m
18:42:00 JST 20 Apr 2026 - Updated or additional information
Tsunami Alert	Pacific coast of central Hokkaido			3 m
Tsunami Alert	Aomori-Pacific coast			3 m
Tsunami Alert	Iwate			3 m
Tsunami Advisory	Eastern part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Western part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Aomori-Sea of Japan			1 m
Tsunami Advisory	Miyagi			1 m
Tsunami Advisory	Fukushima			1 m
Slight sea level change	Southern Sea of Japan coast of Hokkaido			0.2 m
Slight sea level change	Mitsuwan			0.2 m
Slight sea level change	Ibaraki			0.2 m
Slight sea level change	Southern Pacific coast of Chiba			0.2 m
Slight sea level change	Izu Islands			0.2 m
Slight sea level change	Ogasawara Islands			0.2 m
Slight sea level change	Sagami Bay/Miura Peninsula			0.2 m
Slight sea level change	Tokushima			0.2 m
Slight sea level change	Kochi			0.2 m
18:48:00 JST 20 Apr 2026 - Updated or additional information
Tsunami Alert	Pacific coast of central Hokkaido			3 m
Tsunami Alert	Aomori-Pacific coast			3 m
Tsunami Alert	Iwate			3 m
Tsunami Advisory	Eastern part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Western part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Aomori-Sea of Japan			1 m
Tsunami Advisory	Miyagi			1 m
Tsunami Advisory	Fukushima			1 m
Slight sea level change	Southern Sea of Japan coast of Hokkaido			0.2 m
Slight sea level change	Mitsuwan			0.2 m
Slight sea level change	Ibaraki			0.2 m
Slight sea level change	Southern Pacific coast of Chiba			0.2 m
Slight sea level change	Izu Islands			0.2 m
Slight sea level change	Ogasawara Islands			0.2 m
Slight sea level change	Sagami Bay/Miura Peninsula			0.2 m
Slight sea level change	Tokushima			0.2 m
Slight sea level change	Kochi			0.2 m
18:51:00 JST 20 Apr 2026 - Updated or additional information
Tsunami Alert	Pacific coast of central Hokkaido			3 m
Tsunami Alert	Aomori-Pacific coast			3 m
Tsunami Alert	Iwate			3 m
Tsunami Advisory	Eastern part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Western part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Aomori-Sea of Japan			1 m
Tsunami Advisory	Miyagi			1 m
Tsunami Advisory	Fukushima			1 m
Slight sea level change	Southern Sea of Japan coast of Hokkaido			0.2 m
Slight sea level change	Mitsuwan			0.2 m
Slight sea level change	Ibaraki			0.2 m
Slight sea level change	Southern Pacific coast of Chiba			0.2 m
Slight sea level change	Izu Islands			0.2 m
Slight sea level change	Ogasawara Islands			0.2 m
Slight sea level change	Sagami Bay/Miura Peninsula			0.2 m
Slight sea level change	Tokushima			0.2 m
Slight sea level change	Kochi			0.2 m
19:14:00 JST 20 Apr 2026 - Updated or additional information
Tsunami Alert	Pacific coast of central Hokkaido			3 m
Tsunami Alert	Aomori-Pacific coast			3 m
Tsunami Alert	Iwate			3 m
Tsunami Advisory	Eastern part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Western part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Aomori-Sea of Japan			1 m
Tsunami Advisory	Miyagi			1 m
Tsunami Advisory	Fukushima			1 m
Slight sea level change	Southern Sea of Japan coast of Hokkaido			0.2 m
Slight sea level change	Mitsuwan			0.2 m
Slight sea level change	Ibaraki			0.2 m
Slight sea level change	Southern Pacific coast of Chiba			0.2 m
Slight sea level change	Izu Islands			0.2 m
Slight sea level change	Ogasawara Islands			0.2 m
Slight sea level change	Sagami Bay/Miura Peninsula			0.2 m
Slight sea level change	Tokushima			0.2 m
Slight sea level change	Kochi			0.2 m
19:22:00 JST 20 Apr 2026 - Updated or additional information
Tsunami Alert	Pacific coast of central Hokkaido			3 m
Tsunami Alert	Aomori-Pacific coast			3 m
Tsunami Alert	Iwate			3 m
Tsunami Advisory	Eastern part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Western part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Aomori-Sea of Japan			1 m
Tsunami Advisory	Miyagi			1 m
Tsunami Advisory	Fukushima			1 m
Slight sea level change	Southern Sea of Japan coast of Hokkaido			0.2 m
Slight sea level change	Mitsuwan			0.2 m
Slight sea level change	Ibaraki			0.2 m
Slight sea level change	Southern Pacific coast of Chiba			0.2 m
Slight sea level change	Izu Islands			0.2 m
Slight sea level change	Ogasawara Islands			0.2 m
Slight sea level change	Sagami Bay/Miura Peninsula			0.2 m
Slight sea level change	Tokushima			0.2 m
Slight sea level change	Kochi			0.2 m
19:34:00 JST 20 Apr 2026 - Updated or additional information
Tsunami Alert	Pacific coast of central Hokkaido			3 m
Tsunami Alert	Aomori-Pacific coast			3 m
Tsunami Alert	Iwate			3 m
Tsunami Advisory	Eastern part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Western part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Aomori-Sea of Japan			1 m
Tsunami Advisory	Miyagi			1 m
Tsunami Advisory	Fukushima			1 m
Slight sea level change	Southern Sea of Japan coast of Hokkaido			0.2 m
Slight sea level change	Mitsuwan			0.2 m
Slight sea level change	Ibaraki			0.2 m
Slight sea level change	Southern Pacific coast of Chiba			0.2 m
Slight sea level change	Izu Islands			0.2 m
Slight sea level change	Ogasawara Islands			0.2 m
Slight sea level change	Sagami Bay/Miura Peninsula			0.2 m
Slight sea level change	Tokushima			0.2 m
Slight sea level change	Kochi			0.2 m
19:48:00 JST 20 Apr 2026 - Updated or additional information
Tsunami Alert	Pacific coast of central Hokkaido			3 m
Tsunami Alert	Aomori-Pacific coast			3 m
Tsunami Alert	Iwate			3 m
Tsunami Advisory	Eastern part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Western part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Aomori-Sea of Japan			1 m
Tsunami Advisory	Miyagi			1 m
Tsunami Advisory	Fukushima			1 m
Slight sea level change	Southern Sea of Japan coast of Hokkaido			0.2 m
Slight sea level change	Mitsuwan			0.2 m
Slight sea level change	Ibaraki			0.2 m
Slight sea level change	Southern Pacific coast of Chiba			0.2 m
Slight sea level change	Izu Islands			0.2 m
Slight sea level change	Ogasawara Islands			0.2 m
Slight sea level change	Sagami Bay/Miura Peninsula			0.2 m
Slight sea level change	Tokushima			0.2 m
Slight sea level change	Kochi			0.2 m
19:54:00 JST 20 Apr 2026 - Updated or additional information
Tsunami Alert	Pacific coast of central Hokkaido			3 m
Tsunami Alert	Aomori-Pacific coast			3 m
Tsunami Alert	Iwate			3 m
Tsunami Advisory	Eastern part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Western part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Aomori-Sea of Japan			1 m
Tsunami Advisory	Miyagi			1 m
Tsunami Advisory	Fukushima			1 m
Slight sea level change	Southern Sea of Japan coast of Hokkaido			0.2 m
Slight sea level change	Mitsuwan			0.2 m
Slight sea level change	Ibaraki			0.2 m
Slight sea level change	Southern Pacific coast of Chiba			0.2 m
Slight sea level change	Izu Islands			0.2 m
Slight sea level change	Ogasawara Islands			0.2 m
Slight sea level change	Sagami Bay/Miura Peninsula			0.2 m
Slight sea level change	Tokushima			0.2 m
Slight sea level change	Kochi			0.2 m
20:15:00 JST 20 Apr 2026 - Updated or additional information
Tsunami Advisory	Eastern part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Pacific coast of central Hokkaido			1 m
Tsunami Advisory	Western part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Aomori-Sea of Japan			1 m
Tsunami Advisory	Aomori-Pacific coast			1 m
Tsunami Advisory	Iwate			1 m
Tsunami Advisory	Miyagi			1 m
Tsunami Advisory	Fukushima			1 m
Slight sea level change	Southern Sea of Japan coast of Hokkaido			0.2 m
Slight sea level change	Mitsuwan			0.2 m
Slight sea level change	Ibaraki			0.2 m
Slight sea level change	Southern Pacific coast of Chiba			0.2 m
Slight sea level change	Izu Islands			0.2 m
Slight sea level change	Sagami Bay/Miura Peninsula			0.2 m
20:15:00 JST 20 Apr 2026 - Updated or additional information
Tsunami Advisory	Eastern part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Pacific coast of central Hokkaido			1 m
Tsunami Advisory	Western part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Aomori-Sea of Japan			1 m
Tsunami Advisory	Aomori-Pacific coast			1 m
Tsunami Advisory	Iwate			1 m
Tsunami Advisory	Miyagi			1 m
Tsunami Advisory	Fukushima			1 m
Slight sea level change	Southern Sea of Japan coast of Hokkaido			0.2 m
Slight sea level change	Mitsuwan			0.2 m
Slight sea level change	Ibaraki			0.2 m
Slight sea level change	Southern Pacific coast of Chiba			0.2 m
Slight sea level change	Izu Islands			0.2 m
Slight sea level change	Sagami Bay/Miura Peninsula			0.2 m
20:36:00 JST 20 Apr 2026 - Updated or additional information
Tsunami Advisory	Eastern part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Pacific coast of central Hokkaido			1 m
Tsunami Advisory	Western part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Aomori-Sea of Japan			1 m
Tsunami Advisory	Aomori-Pacific coast			1 m
Tsunami Advisory	Iwate			1 m
Tsunami Advisory	Miyagi			1 m
Tsunami Advisory	Fukushima			1 m
Slight sea level change	Southern Sea of Japan coast of Hokkaido			0.2 m
Slight sea level change	Mitsuwan			0.2 m
Slight sea level change	Ibaraki			0.2 m
Slight sea level change	Southern Pacific coast of Chiba			0.2 m
Slight sea level change	Izu Islands			0.2 m
Slight sea level change	Sagami Bay/Miura Peninsula			0.2 m
21:17:00 JST 20 Apr 2026 - Updated or additional information
Tsunami Advisory	Eastern part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Pacific coast of central Hokkaido			1 m
Tsunami Advisory	Western part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Aomori-Sea of Japan			1 m
Tsunami Advisory	Aomori-Pacific coast			1 m
Tsunami Advisory	Iwate			1 m
Tsunami Advisory	Miyagi			1 m
Tsunami Advisory	Fukushima			1 m
Slight sea level change	Southern Sea of Japan coast of Hokkaido			0.2 m
Slight sea level change	Mitsuwan			0.2 m
Slight sea level change	Ibaraki			0.2 m
Slight sea level change	Southern Pacific coast of Chiba			0.2 m
Slight sea level change	Izu Islands			0.2 m
Slight sea level change	Sagami Bay/Miura Peninsula			0.2 m
21:31:00 JST 20 Apr 2026 - Updated or additional information
Tsunami Advisory	Eastern part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Pacific coast of central Hokkaido			1 m
Tsunami Advisory	Western part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Aomori-Sea of Japan			1 m
Tsunami Advisory	Aomori-Pacific coast			1 m
Tsunami Advisory	Iwate			1 m
Tsunami Advisory	Miyagi			1 m
Tsunami Advisory	Fukushima			1 m
Slight sea level change	Southern Sea of Japan coast of Hokkaido			0.2 m
Slight sea level change	Mitsuwan			0.2 m
Slight sea level change	Ibaraki			0.2 m
Slight sea level change	Southern Pacific coast of Chiba			0.2 m
Slight sea level change	Izu Islands			0.2 m
Slight sea level change	Sagami Bay/Miura Peninsula			0.2 m
22:06:00 JST 20 Apr 2026 - Updated or additional information
Tsunami Advisory	Eastern part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Pacific coast of central Hokkaido			1 m
Tsunami Advisory	Western part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Aomori-Sea of Japan			1 m
Tsunami Advisory	Aomori-Pacific coast			1 m
Tsunami Advisory	Iwate			1 m
Tsunami Advisory	Miyagi			1 m
Tsunami Advisory	Fukushima			1 m
Slight sea level change	Southern Sea of Japan coast of Hokkaido			0.2 m
Slight sea level change	Mitsuwan			0.2 m
Slight sea level change	Ibaraki			0.2 m
Slight sea level change	Southern Pacific coast of Chiba			0.2 m
Slight sea level change	Izu Islands			0.2 m
Slight sea level change	Sagami Bay/Miura Peninsula			0.2 m
22:36:00 JST 20 Apr 2026 - Updated or additional information
Tsunami Advisory	Eastern part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Pacific coast of central Hokkaido			1 m
Tsunami Advisory	Western part of the Pacific Coast of Hokkaido			1 m
Tsunami Advisory	Aomori-Sea of Japan			1 m
Tsunami Advisory	Aomori-Pacific coast			1 m
Tsunami Advisory	Iwate			1 m
Tsunami Advisory	Miyagi			1 m
Tsunami Advisory	Fukushima			1 m
Slight sea level change	Southern Sea of Japan coast of Hokkaido			0.2 m
Slight sea level change	Mitsuwan			0.2 m
Slight sea level change	Ibaraki			0.2 m
Slight sea level change	Southern Pacific coast of Chiba			0.2 m
Slight sea level change	Izu Islands			0.2 m
Slight sea level change	Sagami Bay/Miura Peninsula			0.2 m
23:45:00 JST 20 Apr 2026 - Tsunami advisory cancelled
23:52:00 JST 20 Apr 2026 - Updated or additional information
Slight sea level change	Eastern part of the Pacific Coast of Hokkaido			0.2 m
Slight sea level change	Pacific coast of central Hokkaido			0.2 m
Slight sea level change	Western part of the Pacific Coast of Hokkaido			0.2 m
Slight sea level change	Aomori-Sea of Japan			0.2 m
Slight sea level change	Aomori-Pacific coast			0.2 m
Slight sea level change	Iwate			0.2 m
Slight sea level change	Miyagi			0.2 m
Slight sea level change	Fukushima			0.2 m