Tsunamis in Japan Today: Alerts and Activity

Information about tsunamis in Japan, the responsible authority, and official activity available on EarthSentra.

Integrated sources: PTWC (NOAA), JMA / NWPTAC.

Tsunami alerts in Japan today

GDE status No active national alert

Authority Japan Meteorological Agency (JMA)

Official status GDE status: ⚪ Level unavailable

Updated No recent official update · Feed: 25/10/2026 06:57 UTC

We are not recording an active national alert from the integrated authority at this time. The absence of an active record does not replace official emergency instructions.

Source: Japan Meteorological Agency (JMA)

Regional tsunami assessment for Japan

No recent event-linked regional assessment explicitly identifies this country. No recorded assessment does not mean there is no risk.

Map of Japan

Areas with a tsunami alert in Japan

There are currently no areas in Japan with a recorded active official alert.

Official tsunami alerts and bulletins in Japan

There are no official messages within the current operational window for Japan.

Previous tsunami bulletins in Japan

Informational archive. These messages are outside the current operational window and do not by themselves represent a current alert.

Assessment	Scope	UTC time
GDE status: 🔴 High alert	🇯🇵 Japan	09/10/2026 18:37
GDE status: 🔴 High alert	🇯🇵 Japan	30/09/2026 05:08

How to interpret a tsunami alert in Japan

Japan Meteorological Agency (JMA)

JMA divides the Japanese coast into tsunami forecast regions and may issue different alert levels depending on the area.

National priority

When an official national assessment exists, it takes priority for that country over regional or international sources.

No inference

EarthSentra does not automatically turn an undersea earthquake or a regional bulletin into a national alert.

In an emergency, follow evacuation orders and official channels from local authorities. EarthSentra is an information service and does not replace official warning systems.

Historical tsunamis in Japan

A selection of historical tsunamis with documented impact for Japan from the integrated institutional catalogs.

Date	Event / location	Cause	EQ mag.	Max run-up	Deaths
2024-01-01	HONSHU: W COAST	Earthquake and Landslide	M7.5	11.34 m	549
2011-03-11	HONSHU ISLAND	Earthquake	M9.1	39.26 m	18.423
2008-06-13	ARATOZAWA, JAPAN	Earthquake and Landslide	M6.9	2.50 m	23
2003-09-25	HOKKAIDO ISLAND	Earthquake	M8.3	4.40 m	2
1993-07-12	SEA OF JAPAN	Earthquake	M7.7	32.00 m	231
1983-05-26	NOSHIRO, JAPAN	Earthquake	M7.8	14.93 m	104
1982-03-21	HOKKAIDO ISLAND	Earthquake	M6.9	1.30 m	110
1973-06-17	HOKKAIDO ISLAND	Earthquake	M7.7	5.96 m	—
1968-05-16	OFF EAST COAST OF HONSHU ISLAND	Earthquake	M8.2	6.00 m	52
1968-04-01	SEIKAIDO	Earthquake	M7.5	3.07 m	1
1964-06-16	NW. HONSHU ISLAND	Earthquake	M7.6	5.80 m	36
1953-11-25	KASHIMA, JAPAN	Earthquake	M7.4	3.00 m	1
1953-03-11	MYOJINSHO SUBMARINE VOLCANO	Volcano	—	6.00 m	—
1952-03-04	SE. HOKKAIDO ISLAND	Earthquake	M8.1	6.54 m	33
1946-12-20	HONSHU: S COAST	Earthquake	M8.3	6.60 m	1.362
1945-01-12	TOKAIDO	Earthquake	M7.1	1.00 m	2.306
1944-12-07	OFF SOUTHEAST COAST KII PENINSULA	Earthquake	M8.1	10.00 m	1.223
1940-08-01	W. HOKKAIDO ISLAND	Earthquake	M7.5	5.00 m	10
1939-05-01	NW. HONSHU ISLAND	Earthquake	M7.0	1.20 m	27
1933-03-02	SANRIKU	Earthquake	M8.4	29.00 m	3.022
1927-03-07	SW. HONSHU ISLAND	Earthquake and Landslide	M7.6	11.30 m	3.022
1923-09-01	SAGAMI BAY	Earthquake	M7.9	13.00 m	105.385
1914-01-12	SEIKAIDO	Volcano and Earthquake	M7.1	3.00 m	63
1909-08-14	ANEGAWA, JAPAN	Earthquake	M6.9	1.80 m	41
1897-08-05	SANRIKU	Earthquake	M7.7	3.60 m	—
1896-06-15	SANRIKU	Earthquake	M8.3	38.20 m	27.122
1894-03-22	SE. HOKKAIDO ISLAND	Earthquake	M7.9	4.00 m	1
1872-03-14	SW. HONSHU ISLAND	Earthquake	M7.4	3.00 m	804
1861-10-20	OFF MIYAGI	Earthquake	M7.4	3.90 m	—
1856-08-23	SE. HOKKAIDO ISLAND	Earthquake	M8.0	6.00 m	26
1855-11-07	ENSHUNADA	Earthquake	M7.0	3.00 m	—
1854-12-24	NANKAIDO	Earthquake	M8.4	28.00 m	3.000
1854-12-23	ENSHUNADA SEA	Earthquake	M8.3	21.00 m	1.000
1843-04-25	SE. HOKKAIDO ISLAND	Earthquake	M8.4	4.50 m	45
1835-07-20	SANRIKU	Earthquake	M7.6	5.00 m	—
1833-12-07	NW. HONSHU ISLAND	Earthquake	M7.4	9.00 m	85
1810-09-25	NW. HONSHU ISLAND	Earthquake	M6.6	1.00 m	57
1804-07-10	NW. HONSHU ISLAND	Earthquake	M7.3	1.00 m	450
1793-02-17	SANRIKU	Earthquake	M8.3	4.50 m	745
1793-02-08	W. OFF AOMORI	Earthquake	M6.9	1.80 m	12
1792-05-21	SHIMABARA BAY, KYUSHU ISLAND	Volcano, Earthquake and Landslide	M6.4	55.00 m	15.000
1780-09-09	SW. KYUSHU ISLAND	Volcano	—	6.00 m	—
1771-04-24	RYUKYU ISLANDS	Earthquake	M7.4	85.40 m	13.486
1763-01-29	SANRIKU	Earthquake	M7.4	5.00 m	—
1741-08-29	W. HOKKAIDO ISLAND	Volcano and Landslide	M6.9	90.00 m	2.000
1711-12-20	SEIONAIKAI, JAPAN	Earthquake	M6.7	2.00 m	1.000
1707-10-28	ENSHUNADA	Earthquake	M8.4	11.00 m	2.000
1707-10-28	NANKAIDO	Earthquake	M8.4	25.70 m	5.000
1703-12-30	OFF SW BOSO PENINSULA	Earthquake	M8.2	11.70 m	5.233
1677-11-04	OFF SE. BOSO PENINSULA	Earthquake	M7.4	8.00 m	500
1677-04-13	SANRIKU	Earthquake	M8.1	6.00 m	—
1662-10-30	HIUGANADA	Earthquake	M7.9	5.00 m	200
1640-07-31	SE. HOKKAIDO ISLAND	Volcano and Landslide	M6.5	8.00 m	700
1611-12-02	SANRIKU	Earthquake	M8.1	25.00 m	5.000
1605-02-03	NANKAIDO	Earthquake	M7.9	10.00 m	5.000
1596-09-04	BEPPU BAY, KYUSHU	Earthquake and Landslide	M6.9	8.00 m	708
1498-09-20	ENSHUNADA SEA	Earthquake	M8.3	10.00 m	5.000
1495-09-12	KAMAKURA, SAGAMI BAY, TOKAIDO	Earthquake	M7.1	5.00 m	200
1096-12-17	ENSHUNADA	Earthquake	M8.4	7.00 m	—
1026-06-16	OFF MASUDA, SHIMANE PREFECTURE	Earthquake	M7.5	10.00 m	1.001
684-11-29	NANKAIDO	Earthquake	M8.4	3.00 m	—

Public selection of notable historical tsunamis in Japan, derived from the institutional NOAA/NCEI catalogue. The complete catalogue retains 406 certified records; this chronology shows country-origin events meeting documentary impact criteria. Missing values are never invented.

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Tsunamis in Japan: origins and coastal safety

Japan sits along multiple convergent tectonic boundaries where powerful submarine earthquakes can cause tsunamis. Tsunami travel times may be short near the source, so official Japan Meteorological Agency warnings and natural warning signs are critical.

How to use the records

EarthSentra provides supplementary tsunami context and historical data. A historical record or earthquake listing is not an active warning. The absence of a warning displayed here does not guarantee coastal safety.

Natural signs and evacuation

After strong or prolonged shaking on the coast, move immediately away from beaches, harbors and river mouths towards higher ground or inland. Do not wait for a digital warning. Several dangerous waves may arrive over hours. Follow official authorities and consult tsunami information services and the global EarthSentra monitor.