Tsunami Alerts (PTWC) from Pacific Tsunami Warning Center
@tsunamialertsptwc.bsky.social
Tsunami alerts from the PTWC for the Pacific region, including Hawaii.
US Coast/AK: @tsunamialertsntwc.bsky.social
Pacific/HI: @tsunamialertsptwc.bsky.social
US Coast/AK: @tsunamialertsntwc.bsky.social
Pacific/HI: @tsunamialertsptwc.bsky.social
INTERNET AT WWW.TSUNAMI.GOV.
* AUTHORITATIVE INFORMATION ABOUT THE EARTHQUAKE FROM THE U.S.
GEOLOGICAL SURVEY CAN BE FOUND ON THE INTERNET AT
EARTHQUAKE.USGS.GOV.
* AUTHORITATIVE INFORMATION ABOUT THE EARTHQUAKE FROM THE U.S.
GEOLOGICAL SURVEY CAN BE FOUND ON THE INTERNET AT
EARTHQUAKE.USGS.GOV.
December 12, 2025 at 2:56 AM
INTERNET AT WWW.TSUNAMI.GOV.
* AUTHORITATIVE INFORMATION ABOUT THE EARTHQUAKE FROM THE U.S.
GEOLOGICAL SURVEY CAN BE FOUND ON THE INTERNET AT
EARTHQUAKE.USGS.GOV.
* AUTHORITATIVE INFORMATION ABOUT THE EARTHQUAKE FROM THE U.S.
GEOLOGICAL SURVEY CAN BE FOUND ON THE INTERNET AT
EARTHQUAKE.USGS.GOV.
* LOCATION OFF THE EAST COAST OF HONSHU JAPAN
NEXT UPDATE AND ADDITIONAL INFORMATION
---
* THIS WILL BE THE ONLY STATEMENT ISSUED FOR THIS EVENT UNLESS
ADDITIONAL DATA ARE RECEIVED OR THE SITUATION CHANGES.
* FURTHER INFORMATION ABOUT THIS EVENT MAY BE FOUND ON THE
NEXT UPDATE AND ADDITIONAL INFORMATION
---
* THIS WILL BE THE ONLY STATEMENT ISSUED FOR THIS EVENT UNLESS
ADDITIONAL DATA ARE RECEIVED OR THE SITUATION CHANGES.
* FURTHER INFORMATION ABOUT THIS EVENT MAY BE FOUND ON THE
December 12, 2025 at 2:56 AM
* LOCATION OFF THE EAST COAST OF HONSHU JAPAN
NEXT UPDATE AND ADDITIONAL INFORMATION
---
* THIS WILL BE THE ONLY STATEMENT ISSUED FOR THIS EVENT UNLESS
ADDITIONAL DATA ARE RECEIVED OR THE SITUATION CHANGES.
* FURTHER INFORMATION ABOUT THIS EVENT MAY BE FOUND ON THE
NEXT UPDATE AND ADDITIONAL INFORMATION
---
* THIS WILL BE THE ONLY STATEMENT ISSUED FOR THIS EVENT UNLESS
ADDITIONAL DATA ARE RECEIVED OR THE SITUATION CHANGES.
* FURTHER INFORMATION ABOUT THIS EVENT MAY BE FOUND ON THE
RECOMMENDED ACTIONS
---
* NO ACTION IS REQUIRED.
POTENTIAL IMPACTS
---
* NO TSUNAMI IMPACTS ARE EXPECTED.
PRELIMINARY EARTHQUAKE PARAMETERS
---
* MAGNITUDE 6.7
* ORIGIN TIME 1244 PM CHST DEC 12 2025
* COORDINATES 40.9 NORTH 143.0 EAST
* DEPTH 10 MILES
---
* NO ACTION IS REQUIRED.
POTENTIAL IMPACTS
---
* NO TSUNAMI IMPACTS ARE EXPECTED.
PRELIMINARY EARTHQUAKE PARAMETERS
---
* MAGNITUDE 6.7
* ORIGIN TIME 1244 PM CHST DEC 12 2025
* COORDINATES 40.9 NORTH 143.0 EAST
* DEPTH 10 MILES
December 12, 2025 at 2:56 AM
RECOMMENDED ACTIONS
---
* NO ACTION IS REQUIRED.
POTENTIAL IMPACTS
---
* NO TSUNAMI IMPACTS ARE EXPECTED.
PRELIMINARY EARTHQUAKE PARAMETERS
---
* MAGNITUDE 6.7
* ORIGIN TIME 1244 PM CHST DEC 12 2025
* COORDINATES 40.9 NORTH 143.0 EAST
* DEPTH 10 MILES
---
* NO ACTION IS REQUIRED.
POTENTIAL IMPACTS
---
* NO TSUNAMI IMPACTS ARE EXPECTED.
PRELIMINARY EARTHQUAKE PARAMETERS
---
* MAGNITUDE 6.7
* ORIGIN TIME 1244 PM CHST DEC 12 2025
* COORDINATES 40.9 NORTH 143.0 EAST
* DEPTH 10 MILES
EVALUATION
---
* AN EARTHQUAKE WITH A PRELIMINARY MAGNITUDE OF 6.7 OCCURRED
OFF THE EAST COAST OF HONSHU, JAPAN AT 1244 PM CHST ON
FRIDAY DECEMBER 12 2025.
* BASED ON ALL AVAILABLE DATA... THERE IS NO TSUNAMI THREAT TO
GUAM... ROTA... TINIAN OR SAIPAN FROM THIS EARTHQUAKE.
---
* AN EARTHQUAKE WITH A PRELIMINARY MAGNITUDE OF 6.7 OCCURRED
OFF THE EAST COAST OF HONSHU, JAPAN AT 1244 PM CHST ON
FRIDAY DECEMBER 12 2025.
* BASED ON ALL AVAILABLE DATA... THERE IS NO TSUNAMI THREAT TO
GUAM... ROTA... TINIAN OR SAIPAN FROM THIS EARTHQUAKE.
December 12, 2025 at 2:56 AM
EVALUATION
---
* AN EARTHQUAKE WITH A PRELIMINARY MAGNITUDE OF 6.7 OCCURRED
OFF THE EAST COAST OF HONSHU, JAPAN AT 1244 PM CHST ON
FRIDAY DECEMBER 12 2025.
* BASED ON ALL AVAILABLE DATA... THERE IS NO TSUNAMI THREAT TO
GUAM... ROTA... TINIAN OR SAIPAN FROM THIS EARTHQUAKE.
---
* AN EARTHQUAKE WITH A PRELIMINARY MAGNITUDE OF 6.7 OCCURRED
OFF THE EAST COAST OF HONSHU, JAPAN AT 1244 PM CHST ON
FRIDAY DECEMBER 12 2025.
* BASED ON ALL AVAILABLE DATA... THERE IS NO TSUNAMI THREAT TO
GUAM... ROTA... TINIAN OR SAIPAN FROM THIS EARTHQUAKE.
* COASTAL REGIONS OF CALIFORNIA... OREGON... WASHINGTON...
BRITISH COLUMBIA AND ALASKA SHOULD ONLY REFER TO U.S.
NATIONAL TSUNAMI WARNING CENTER MESSAGES THAT CAN BE FOUND
AT WWW.TSUNAMI.GOV.
BRITISH COLUMBIA AND ALASKA SHOULD ONLY REFER TO U.S.
NATIONAL TSUNAMI WARNING CENTER MESSAGES THAT CAN BE FOUND
AT WWW.TSUNAMI.GOV.
December 12, 2025 at 2:55 AM
* COASTAL REGIONS OF CALIFORNIA... OREGON... WASHINGTON...
BRITISH COLUMBIA AND ALASKA SHOULD ONLY REFER TO U.S.
NATIONAL TSUNAMI WARNING CENTER MESSAGES THAT CAN BE FOUND
AT WWW.TSUNAMI.GOV.
BRITISH COLUMBIA AND ALASKA SHOULD ONLY REFER TO U.S.
NATIONAL TSUNAMI WARNING CENTER MESSAGES THAT CAN BE FOUND
AT WWW.TSUNAMI.GOV.
* FURTHER INFORMATION ABOUT THIS EVENT MAY BE FOUND AT
WWW.TSUNAMI.GOV.
* COASTAL REGIONS OF HAWAII... AMERICAN SAMOA... GUAM... AND
CNMI SHOULD REFER TO PACIFIC TSUNAMI WARNING CENTER MESSAGES
SPECIFICALLY FOR THOSE PLACES THAT CAN BE FOUND AT
WWW.TSUNAMI.GOV.
WWW.TSUNAMI.GOV.
* COASTAL REGIONS OF HAWAII... AMERICAN SAMOA... GUAM... AND
CNMI SHOULD REFER TO PACIFIC TSUNAMI WARNING CENTER MESSAGES
SPECIFICALLY FOR THOSE PLACES THAT CAN BE FOUND AT
WWW.TSUNAMI.GOV.
December 12, 2025 at 2:55 AM
* FURTHER INFORMATION ABOUT THIS EVENT MAY BE FOUND AT
WWW.TSUNAMI.GOV.
* COASTAL REGIONS OF HAWAII... AMERICAN SAMOA... GUAM... AND
CNMI SHOULD REFER TO PACIFIC TSUNAMI WARNING CENTER MESSAGES
SPECIFICALLY FOR THOSE PLACES THAT CAN BE FOUND AT
WWW.TSUNAMI.GOV.
WWW.TSUNAMI.GOV.
* COASTAL REGIONS OF HAWAII... AMERICAN SAMOA... GUAM... AND
CNMI SHOULD REFER TO PACIFIC TSUNAMI WARNING CENTER MESSAGES
SPECIFICALLY FOR THOSE PLACES THAT CAN BE FOUND AT
WWW.TSUNAMI.GOV.
* THIS WILL BE THE ONLY STATEMENT ISSUED FOR THIS EVENT UNLESS
ADDITIONAL DATA ARE RECEIVED OR THE SITUATION CHANGES.
* AUTHORITATIVE INFORMATION ABOUT THE EARTHQUAKE FROM THE U.S.
GEOLOGICAL SURVEY CAN BE FOUND ON THE INTERNET AT
EARTHQUAKE.USGS.GOV.
ADDITIONAL DATA ARE RECEIVED OR THE SITUATION CHANGES.
* AUTHORITATIVE INFORMATION ABOUT THE EARTHQUAKE FROM THE U.S.
GEOLOGICAL SURVEY CAN BE FOUND ON THE INTERNET AT
EARTHQUAKE.USGS.GOV.
December 12, 2025 at 2:55 AM
* THIS WILL BE THE ONLY STATEMENT ISSUED FOR THIS EVENT UNLESS
ADDITIONAL DATA ARE RECEIVED OR THE SITUATION CHANGES.
* AUTHORITATIVE INFORMATION ABOUT THE EARTHQUAKE FROM THE U.S.
GEOLOGICAL SURVEY CAN BE FOUND ON THE INTERNET AT
EARTHQUAKE.USGS.GOV.
ADDITIONAL DATA ARE RECEIVED OR THE SITUATION CHANGES.
* AUTHORITATIVE INFORMATION ABOUT THE EARTHQUAKE FROM THE U.S.
GEOLOGICAL SURVEY CAN BE FOUND ON THE INTERNET AT
EARTHQUAKE.USGS.GOV.
OFF THE EAST COAST OF HONSHU, JAPAN AT 0244 UTC ON FRIDAY
DECEMBER 12 2025.
* BASED ON ALL AVAILABLE DATA... THERE IS NO TSUNAMI THREAT
FROM THIS EARTHQUAKE.
RECOMMENDED ACTIONS
---
* NO ACTION IS REQUIRED.
NEXT UPDATE AND ADDITIONAL INFORMATION
---
DECEMBER 12 2025.
* BASED ON ALL AVAILABLE DATA... THERE IS NO TSUNAMI THREAT
FROM THIS EARTHQUAKE.
RECOMMENDED ACTIONS
---
* NO ACTION IS REQUIRED.
NEXT UPDATE AND ADDITIONAL INFORMATION
---
December 12, 2025 at 2:55 AM
OFF THE EAST COAST OF HONSHU, JAPAN AT 0244 UTC ON FRIDAY
DECEMBER 12 2025.
* BASED ON ALL AVAILABLE DATA... THERE IS NO TSUNAMI THREAT
FROM THIS EARTHQUAKE.
RECOMMENDED ACTIONS
---
* NO ACTION IS REQUIRED.
NEXT UPDATE AND ADDITIONAL INFORMATION
---
DECEMBER 12 2025.
* BASED ON ALL AVAILABLE DATA... THERE IS NO TSUNAMI THREAT
FROM THIS EARTHQUAKE.
RECOMMENDED ACTIONS
---
* NO ACTION IS REQUIRED.
NEXT UPDATE AND ADDITIONAL INFORMATION
---
are evaluated not to have destructive teletsunamigenic potential, or for large earthquakes with tsunamigenic potential located in the Pacific region but outside the Pacific Basin.
EVALUATION
---
* AN EARTHQUAKE WITH A PRELIMINARY MAGNITUDE OF 6.7 OCCURRED
EVALUATION
---
* AN EARTHQUAKE WITH A PRELIMINARY MAGNITUDE OF 6.7 OCCURRED
December 12, 2025 at 2:55 AM
are evaluated not to have destructive teletsunamigenic potential, or for large earthquakes with tsunamigenic potential located in the Pacific region but outside the Pacific Basin.
EVALUATION
---
* AN EARTHQUAKE WITH A PRELIMINARY MAGNITUDE OF 6.7 OCCURRED
EVALUATION
---
* AN EARTHQUAKE WITH A PRELIMINARY MAGNITUDE OF 6.7 OCCURRED
SPECIFICALLY FOR THOSE PLACES THAT CAN BE FOUND AT
WWW.TSUNAMI.GOV.
* COASTAL REGIONS OF CALIFORNIA... OREGON... WASHINGTON...
BRITISH COLUMBIA AND ALASKA SHOULD ONLY REFER TO U.S.
NATIONAL TSUNAMI WARNING CENTER MESSAGES THAT CAN BE FOUND
AT WWW.TSUNAMI.GOV.
WWW.TSUNAMI.GOV.
* COASTAL REGIONS OF CALIFORNIA... OREGON... WASHINGTON...
BRITISH COLUMBIA AND ALASKA SHOULD ONLY REFER TO U.S.
NATIONAL TSUNAMI WARNING CENTER MESSAGES THAT CAN BE FOUND
AT WWW.TSUNAMI.GOV.
December 8, 2025 at 5:28 PM
SPECIFICALLY FOR THOSE PLACES THAT CAN BE FOUND AT
WWW.TSUNAMI.GOV.
* COASTAL REGIONS OF CALIFORNIA... OREGON... WASHINGTON...
BRITISH COLUMBIA AND ALASKA SHOULD ONLY REFER TO U.S.
NATIONAL TSUNAMI WARNING CENTER MESSAGES THAT CAN BE FOUND
AT WWW.TSUNAMI.GOV.
WWW.TSUNAMI.GOV.
* COASTAL REGIONS OF CALIFORNIA... OREGON... WASHINGTON...
BRITISH COLUMBIA AND ALASKA SHOULD ONLY REFER TO U.S.
NATIONAL TSUNAMI WARNING CENTER MESSAGES THAT CAN BE FOUND
AT WWW.TSUNAMI.GOV.
GEOLOGICAL SURVEY CAN BE FOUND ON THE INTERNET AT
EARTHQUAKE.USGS.GOV.
* FURTHER INFORMATION ABOUT THIS EVENT MAY BE FOUND AT
WWW.TSUNAMI.GOV.
* COASTAL REGIONS OF HAWAII... AMERICAN SAMOA... GUAM... AND
CNMI SHOULD REFER TO PACIFIC TSUNAMI WARNING CENTER MESSAGES
EARTHQUAKE.USGS.GOV.
* FURTHER INFORMATION ABOUT THIS EVENT MAY BE FOUND AT
WWW.TSUNAMI.GOV.
* COASTAL REGIONS OF HAWAII... AMERICAN SAMOA... GUAM... AND
CNMI SHOULD REFER TO PACIFIC TSUNAMI WARNING CENTER MESSAGES
December 8, 2025 at 5:28 PM
GEOLOGICAL SURVEY CAN BE FOUND ON THE INTERNET AT
EARTHQUAKE.USGS.GOV.
* FURTHER INFORMATION ABOUT THIS EVENT MAY BE FOUND AT
WWW.TSUNAMI.GOV.
* COASTAL REGIONS OF HAWAII... AMERICAN SAMOA... GUAM... AND
CNMI SHOULD REFER TO PACIFIC TSUNAMI WARNING CENTER MESSAGES
EARTHQUAKE.USGS.GOV.
* FURTHER INFORMATION ABOUT THIS EVENT MAY BE FOUND AT
WWW.TSUNAMI.GOV.
* COASTAL REGIONS OF HAWAII... AMERICAN SAMOA... GUAM... AND
CNMI SHOULD REFER TO PACIFIC TSUNAMI WARNING CENTER MESSAGES
* JAPAN METEOROLOGICAL AGENCY HAS REPORTED A WAVE AMPLITUDE
OF 0.70 M AT THE KUJIKO TIDE GAUGE.
NEXT UPDATE AND ADDITIONAL INFORMATION
---
* THE NEXT MESSAGE WILL BE ISSUED IN ONE HOUR... OR SOONER IF
THE SITUATION WARRANTS.
* AUTHORITATIVE INFORMATION ABOUT THE EARTHQUAKE FROM THE U.S.
OF 0.70 M AT THE KUJIKO TIDE GAUGE.
NEXT UPDATE AND ADDITIONAL INFORMATION
---
* THE NEXT MESSAGE WILL BE ISSUED IN ONE HOUR... OR SOONER IF
THE SITUATION WARRANTS.
* AUTHORITATIVE INFORMATION ABOUT THE EARTHQUAKE FROM THE U.S.
December 8, 2025 at 5:28 PM
* JAPAN METEOROLOGICAL AGENCY HAS REPORTED A WAVE AMPLITUDE
OF 0.70 M AT THE KUJIKO TIDE GAUGE.
NEXT UPDATE AND ADDITIONAL INFORMATION
---
* THE NEXT MESSAGE WILL BE ISSUED IN ONE HOUR... OR SOONER IF
THE SITUATION WARRANTS.
* AUTHORITATIVE INFORMATION ABOUT THE EARTHQUAKE FROM THE U.S.
OF 0.70 M AT THE KUJIKO TIDE GAUGE.
NEXT UPDATE AND ADDITIONAL INFORMATION
---
* THE NEXT MESSAGE WILL BE ISSUED IN ONE HOUR... OR SOONER IF
THE SITUATION WARRANTS.
* AUTHORITATIVE INFORMATION ABOUT THE EARTHQUAKE FROM THE U.S.
GAUGE TIME OF MAXIMUM WAVE
COORDINATES MEASURE TSUNAMI PERIOD
GAUGE LOCATION LAT LON (UTC) HEIGHT (MIN)
---
HAKODATE JP 41.8N 140.7E 1636 0.19M/ 0.6FT 26
OFUNATO HONSHU JP 39.0N 141.8E 1512 0.16M/ 0.5FT 10
KUSHIRO JP 43.0N 144.4E 1520 0.12M/ 0.4FT **
COORDINATES MEASURE TSUNAMI PERIOD
GAUGE LOCATION LAT LON (UTC) HEIGHT (MIN)
---
HAKODATE JP 41.8N 140.7E 1636 0.19M/ 0.6FT 26
OFUNATO HONSHU JP 39.0N 141.8E 1512 0.16M/ 0.5FT 10
KUSHIRO JP 43.0N 144.4E 1520 0.12M/ 0.4FT **
December 8, 2025 at 5:28 PM
GAUGE TIME OF MAXIMUM WAVE
COORDINATES MEASURE TSUNAMI PERIOD
GAUGE LOCATION LAT LON (UTC) HEIGHT (MIN)
---
HAKODATE JP 41.8N 140.7E 1636 0.19M/ 0.6FT 26
OFUNATO HONSHU JP 39.0N 141.8E 1512 0.16M/ 0.5FT 10
KUSHIRO JP 43.0N 144.4E 1520 0.12M/ 0.4FT **
COORDINATES MEASURE TSUNAMI PERIOD
GAUGE LOCATION LAT LON (UTC) HEIGHT (MIN)
---
HAKODATE JP 41.8N 140.7E 1636 0.19M/ 0.6FT 26
OFUNATO HONSHU JP 39.0N 141.8E 1512 0.16M/ 0.5FT 10
KUSHIRO JP 43.0N 144.4E 1520 0.12M/ 0.4FT **
CRUSHED BY DEBRIS IN THE WATER... OR BE SWEPT OUT TO SEA.
TSUNAMI OBSERVATIONS
---
* THE FOLLOWING ARE TSUNAMI WAVE OBSERVATIONS FROM COASTAL
AND/OR DEEP-OCEAN SEA LEVEL GAUGES AT THE INDICATED
LOCATIONS. THE MAXIMUM TSUNAMI HEIGHT IS MEASURED WITH
RESPECT TO THE NORMAL TIDE LEVEL.
TSUNAMI OBSERVATIONS
---
* THE FOLLOWING ARE TSUNAMI WAVE OBSERVATIONS FROM COASTAL
AND/OR DEEP-OCEAN SEA LEVEL GAUGES AT THE INDICATED
LOCATIONS. THE MAXIMUM TSUNAMI HEIGHT IS MEASURED WITH
RESPECT TO THE NORMAL TIDE LEVEL.
December 8, 2025 at 5:28 PM
CRUSHED BY DEBRIS IN THE WATER... OR BE SWEPT OUT TO SEA.
TSUNAMI OBSERVATIONS
---
* THE FOLLOWING ARE TSUNAMI WAVE OBSERVATIONS FROM COASTAL
AND/OR DEEP-OCEAN SEA LEVEL GAUGES AT THE INDICATED
LOCATIONS. THE MAXIMUM TSUNAMI HEIGHT IS MEASURED WITH
RESPECT TO THE NORMAL TIDE LEVEL.
TSUNAMI OBSERVATIONS
---
* THE FOLLOWING ARE TSUNAMI WAVE OBSERVATIONS FROM COASTAL
AND/OR DEEP-OCEAN SEA LEVEL GAUGES AT THE INDICATED
LOCATIONS. THE MAXIMUM TSUNAMI HEIGHT IS MEASURED WITH
RESPECT TO THE NORMAL TIDE LEVEL.
THE NEXT DUE TO LOCAL BATHYMETRY AND THE SHAPE AND ELEVATION
OF THE SHORELINE.
* IMPACTS CAN ALSO VARY DEPENDING UPON THE STATE OF THE TIDE AT
THE TIME OF THE MAXIMUM TSUNAMI WAVES.
* PERSONS CAUGHT IN THE WATER OF A TSUNAMI MAY DROWN... BE
OF THE SHORELINE.
* IMPACTS CAN ALSO VARY DEPENDING UPON THE STATE OF THE TIDE AT
THE TIME OF THE MAXIMUM TSUNAMI WAVES.
* PERSONS CAUGHT IN THE WATER OF A TSUNAMI MAY DROWN... BE
December 8, 2025 at 5:28 PM
THE NEXT DUE TO LOCAL BATHYMETRY AND THE SHAPE AND ELEVATION
OF THE SHORELINE.
* IMPACTS CAN ALSO VARY DEPENDING UPON THE STATE OF THE TIDE AT
THE TIME OF THE MAXIMUM TSUNAMI WAVES.
* PERSONS CAUGHT IN THE WATER OF A TSUNAMI MAY DROWN... BE
OF THE SHORELINE.
* IMPACTS CAN ALSO VARY DEPENDING UPON THE STATE OF THE TIDE AT
THE TIME OF THE MAXIMUM TSUNAMI WAVES.
* PERSONS CAUGHT IN THE WATER OF A TSUNAMI MAY DROWN... BE
* A TSUNAMI IS A SERIES OF WAVES. THE TIME BETWEEN WAVE CRESTS
CAN VARY FROM 5 MINUTES TO AN HOUR. THE HAZARD MAY PERSIST
FOR MANY HOURS OR LONGER AFTER THE INITIAL WAVE.
* IMPACTS CAN VARY SIGNIFICANTLY FROM ONE SECTION OF COAST TO
CAN VARY FROM 5 MINUTES TO AN HOUR. THE HAZARD MAY PERSIST
FOR MANY HOURS OR LONGER AFTER THE INITIAL WAVE.
* IMPACTS CAN VARY SIGNIFICANTLY FROM ONE SECTION OF COAST TO
December 8, 2025 at 5:28 PM
* A TSUNAMI IS A SERIES OF WAVES. THE TIME BETWEEN WAVE CRESTS
CAN VARY FROM 5 MINUTES TO AN HOUR. THE HAZARD MAY PERSIST
FOR MANY HOURS OR LONGER AFTER THE INITIAL WAVE.
* IMPACTS CAN VARY SIGNIFICANTLY FROM ONE SECTION OF COAST TO
CAN VARY FROM 5 MINUTES TO AN HOUR. THE HAZARD MAY PERSIST
FOR MANY HOURS OR LONGER AFTER THE INITIAL WAVE.
* IMPACTS CAN VARY SIGNIFICANTLY FROM ONE SECTION OF COAST TO
SAPPORO JAPAN 43.5N 141.0E 1622 12/08
NIIGATA JAPAN 38.0N 139.0E 1640 12/08
SHIMIZU JAPAN 32.8N 133.0E 1658 12/08
NOBEOKA JAPAN 32.5N 131.8E 1705 12/08
SHIMANE JAPAN 35.8N 133.0E 1739 12/08
NAGASAKI JAPAN 32.7N 129.7E 1848 12/08
POTENTIAL IMPACTS
---
NIIGATA JAPAN 38.0N 139.0E 1640 12/08
SHIMIZU JAPAN 32.8N 133.0E 1658 12/08
NOBEOKA JAPAN 32.5N 131.8E 1705 12/08
SHIMANE JAPAN 35.8N 133.0E 1739 12/08
NAGASAKI JAPAN 32.7N 129.7E 1848 12/08
POTENTIAL IMPACTS
---
December 8, 2025 at 5:28 PM
SAPPORO JAPAN 43.5N 141.0E 1622 12/08
NIIGATA JAPAN 38.0N 139.0E 1640 12/08
SHIMIZU JAPAN 32.8N 133.0E 1658 12/08
NOBEOKA JAPAN 32.5N 131.8E 1705 12/08
SHIMANE JAPAN 35.8N 133.0E 1739 12/08
NAGASAKI JAPAN 32.7N 129.7E 1848 12/08
POTENTIAL IMPACTS
---
NIIGATA JAPAN 38.0N 139.0E 1640 12/08
SHIMIZU JAPAN 32.8N 133.0E 1658 12/08
NOBEOKA JAPAN 32.5N 131.8E 1705 12/08
SHIMANE JAPAN 35.8N 133.0E 1739 12/08
NAGASAKI JAPAN 32.7N 129.7E 1848 12/08
POTENTIAL IMPACTS
---
FOR PLACES WITHIN THREATENED REGIONS ARE GIVEN BELOW. ACTUAL
ARRIVAL TIMES MAY DIFFER AND THE INITIAL WAVE MAY NOT BE THE
LARGEST. A TSUNAMI IS A SERIES OF WAVES AND THE TIME BETWEEN
WAVES CAN BE FIVE MINUTES TO ONE HOUR.
LOCATION REGION COORDINATES ETA(UTC)
---
ARRIVAL TIMES MAY DIFFER AND THE INITIAL WAVE MAY NOT BE THE
LARGEST. A TSUNAMI IS A SERIES OF WAVES AND THE TIME BETWEEN
WAVES CAN BE FIVE MINUTES TO ONE HOUR.
LOCATION REGION COORDINATES ETA(UTC)
---
December 8, 2025 at 5:28 PM
FOR PLACES WITHIN THREATENED REGIONS ARE GIVEN BELOW. ACTUAL
ARRIVAL TIMES MAY DIFFER AND THE INITIAL WAVE MAY NOT BE THE
LARGEST. A TSUNAMI IS A SERIES OF WAVES AND THE TIME BETWEEN
WAVES CAN BE FIVE MINUTES TO ONE HOUR.
LOCATION REGION COORDINATES ETA(UTC)
---
ARRIVAL TIMES MAY DIFFER AND THE INITIAL WAVE MAY NOT BE THE
LARGEST. A TSUNAMI IS A SERIES OF WAVES AND THE TIME BETWEEN
WAVES CAN BE FIVE MINUTES TO ONE HOUR.
LOCATION REGION COORDINATES ETA(UTC)
---
EVALUATION... PROCEDURES AND THE LEVEL OF THREAT.
* PERSONS LOCATED IN THREATENED COASTAL AREAS SHOULD STAY ALERT
FOR INFORMATION AND FOLLOW INSTRUCTIONS FROM NATIONAL AND
LOCAL AUTHORITIES.
ESTIMATED TIMES OF ARRIVAL
---
* ESTIMATED TIMES OF ARRIVAL -ETA- OF THE INITIAL TSUNAMI WAVE
* PERSONS LOCATED IN THREATENED COASTAL AREAS SHOULD STAY ALERT
FOR INFORMATION AND FOLLOW INSTRUCTIONS FROM NATIONAL AND
LOCAL AUTHORITIES.
ESTIMATED TIMES OF ARRIVAL
---
* ESTIMATED TIMES OF ARRIVAL -ETA- OF THE INITIAL TSUNAMI WAVE
December 8, 2025 at 5:28 PM
EVALUATION... PROCEDURES AND THE LEVEL OF THREAT.
* PERSONS LOCATED IN THREATENED COASTAL AREAS SHOULD STAY ALERT
FOR INFORMATION AND FOLLOW INSTRUCTIONS FROM NATIONAL AND
LOCAL AUTHORITIES.
ESTIMATED TIMES OF ARRIVAL
---
* ESTIMATED TIMES OF ARRIVAL -ETA- OF THE INITIAL TSUNAMI WAVE
* PERSONS LOCATED IN THREATENED COASTAL AREAS SHOULD STAY ALERT
FOR INFORMATION AND FOLLOW INSTRUCTIONS FROM NATIONAL AND
LOCAL AUTHORITIES.
ESTIMATED TIMES OF ARRIVAL
---
* ESTIMATED TIMES OF ARRIVAL -ETA- OF THE INITIAL TSUNAMI WAVE
YET BEEN COMPUTED. THE FORECAST WILL BE EXPANDED IF
NECESSARY IN SUBSEQUENT PRODUCTS.
RECOMMENDED ACTIONS
---
* GOVERNMENT AGENCIES RESPONSIBLE FOR THREATENED COASTAL AREAS
SHOULD TAKE ACTION TO INFORM AND INSTRUCT ANY COASTAL
POPULATIONS AT RISK IN ACCORDANCE WITH THEIR OWN
NECESSARY IN SUBSEQUENT PRODUCTS.
RECOMMENDED ACTIONS
---
* GOVERNMENT AGENCIES RESPONSIBLE FOR THREATENED COASTAL AREAS
SHOULD TAKE ACTION TO INFORM AND INSTRUCT ANY COASTAL
POPULATIONS AT RISK IN ACCORDANCE WITH THEIR OWN
December 8, 2025 at 5:28 PM
YET BEEN COMPUTED. THE FORECAST WILL BE EXPANDED IF
NECESSARY IN SUBSEQUENT PRODUCTS.
RECOMMENDED ACTIONS
---
* GOVERNMENT AGENCIES RESPONSIBLE FOR THREATENED COASTAL AREAS
SHOULD TAKE ACTION TO INFORM AND INSTRUCT ANY COASTAL
POPULATIONS AT RISK IN ACCORDANCE WITH THEIR OWN
NECESSARY IN SUBSEQUENT PRODUCTS.
RECOMMENDED ACTIONS
---
* GOVERNMENT AGENCIES RESPONSIBLE FOR THREATENED COASTAL AREAS
SHOULD TAKE ACTION TO INFORM AND INSTRUCT ANY COASTAL
POPULATIONS AT RISK IN ACCORDANCE WITH THEIR OWN
AMPLITUDES DUE TO UNCERTAINTIES IN THE FORECAST AND LOCAL
FEATURES. IN PARTICULAR MAXIMUM TSUNAMI AMPLITUDES ON ATOLLS
AND AT LOCATIONS WITH FRINGING OR BARRIER REEFS WILL LIKELY
BE MUCH SMALLER THAN THE FORECAST INDICATES.
* FOR OTHER AREAS COVERED BY THIS PRODUCT A FORECAST HAS NOT
FEATURES. IN PARTICULAR MAXIMUM TSUNAMI AMPLITUDES ON ATOLLS
AND AT LOCATIONS WITH FRINGING OR BARRIER REEFS WILL LIKELY
BE MUCH SMALLER THAN THE FORECAST INDICATES.
* FOR OTHER AREAS COVERED BY THIS PRODUCT A FORECAST HAS NOT
December 8, 2025 at 5:28 PM
AMPLITUDES DUE TO UNCERTAINTIES IN THE FORECAST AND LOCAL
FEATURES. IN PARTICULAR MAXIMUM TSUNAMI AMPLITUDES ON ATOLLS
AND AT LOCATIONS WITH FRINGING OR BARRIER REEFS WILL LIKELY
BE MUCH SMALLER THAN THE FORECAST INDICATES.
* FOR OTHER AREAS COVERED BY THIS PRODUCT A FORECAST HAS NOT
FEATURES. IN PARTICULAR MAXIMUM TSUNAMI AMPLITUDES ON ATOLLS
AND AT LOCATIONS WITH FRINGING OR BARRIER REEFS WILL LIKELY
BE MUCH SMALLER THAN THE FORECAST INDICATES.
* FOR OTHER AREAS COVERED BY THIS PRODUCT A FORECAST HAS NOT
* BASED ON ALL AVAILABLE DATA... HAZARDOUS TSUNAMI WAVES ARE
FORECAST FOR SOME COASTS.
TSUNAMI THREAT FORECAST
---
* TSUNAMI WAVES REACHING 0.3 TO 1 METERS ABOVE THE TIDE LEVEL
ARE POSSIBLE FOR SOME COASTS OF
JAPAN.
* ACTUAL AMPLITUDES AT THE COAST MAY VARY FROM FORECAST
FORECAST FOR SOME COASTS.
TSUNAMI THREAT FORECAST
---
* TSUNAMI WAVES REACHING 0.3 TO 1 METERS ABOVE THE TIDE LEVEL
ARE POSSIBLE FOR SOME COASTS OF
JAPAN.
* ACTUAL AMPLITUDES AT THE COAST MAY VARY FROM FORECAST
December 8, 2025 at 5:28 PM
* BASED ON ALL AVAILABLE DATA... HAZARDOUS TSUNAMI WAVES ARE
FORECAST FOR SOME COASTS.
TSUNAMI THREAT FORECAST
---
* TSUNAMI WAVES REACHING 0.3 TO 1 METERS ABOVE THE TIDE LEVEL
ARE POSSIBLE FOR SOME COASTS OF
JAPAN.
* ACTUAL AMPLITUDES AT THE COAST MAY VARY FROM FORECAST
FORECAST FOR SOME COASTS.
TSUNAMI THREAT FORECAST
---
* TSUNAMI WAVES REACHING 0.3 TO 1 METERS ABOVE THE TIDE LEVEL
ARE POSSIBLE FOR SOME COASTS OF
JAPAN.
* ACTUAL AMPLITUDES AT THE COAST MAY VARY FROM FORECAST
otentially destructive teletsunamis generated anywhere in the Pacific Basin.
EVALUATION
---
* AN EARTHQUAKE WITH A PRELIMINARY MAGNITUDE OF 7.6 OCCURRED IN
THE HOKKAIDO, JAPAN REGION AT 1415 UTC ON MONDAY DECEMBER 8
2025.
* TSUNAMI WAVES HAVE BEEN OBSERVED.
EVALUATION
---
* AN EARTHQUAKE WITH A PRELIMINARY MAGNITUDE OF 7.6 OCCURRED IN
THE HOKKAIDO, JAPAN REGION AT 1415 UTC ON MONDAY DECEMBER 8
2025.
* TSUNAMI WAVES HAVE BEEN OBSERVED.
December 8, 2025 at 5:28 PM
otentially destructive teletsunamis generated anywhere in the Pacific Basin.
EVALUATION
---
* AN EARTHQUAKE WITH A PRELIMINARY MAGNITUDE OF 7.6 OCCURRED IN
THE HOKKAIDO, JAPAN REGION AT 1415 UTC ON MONDAY DECEMBER 8
2025.
* TSUNAMI WAVES HAVE BEEN OBSERVED.
EVALUATION
---
* AN EARTHQUAKE WITH A PRELIMINARY MAGNITUDE OF 7.6 OCCURRED IN
THE HOKKAIDO, JAPAN REGION AT 1415 UTC ON MONDAY DECEMBER 8
2025.
* TSUNAMI WAVES HAVE BEEN OBSERVED.