CENC（第一次）：据中国地震台网正式测定，北京时间7月20日14时28分（当地时间7月20日17时28分）在堪察加东岸远海发生6.6级地震，震源深度10公里，震中位于北纬53.05度，东经160.40度。
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TSUNAMI THREAT FORECAST----------------------- * HAZARDOUS TSUNAMI WAVES FROM THIS EARTHQUAKE ARE POSSIBLE WITHIN 300 KM OF THE EPICENTER ALONG THE COASTS OF RUSSIA.
WEPA40 RJTD 200708
TSUNAMI BULLETIN NUMBER 001
ISSUED BY NWPTAC(JMA)
ISSUED AT 0708Z 20 JUL 2025
PART 01 OF 01 PARTS
HYPOCENTRAL PARAMETERS
ORIGIN TIME:0649Z 20 JUL 2025
PRELIMINARY EPICENTER:LAT52.5NORTH LON160.7EAST
OFF EAST COAST OF KAMCHATKA
JAPAN - KURIL ISLANDS - KAMCHATKA PENINSULA
MAG:7.5
EVALUATION
THERE IS A POSSIBILITY OF A DESTRUCTIVE LOCAL TSUNAMI
NEAR THE EPICENTER
THIS BULLETIN IS FOR
EAST COASTS OF KAMCHATKA PENINSULA
ESTIMATED TSUNAMI ARRIVAL TIMES AND WAVE AMPLITUDES
EAST COASTS OF KAMCHATKA PENINSULA
LOCATION COORDINATES ARRIVAL TIME AMPL
PETROPAVLOVSK_K 53.2N 159.6E 0713Z 20 JUL 1-3M
AMPL - MAXIMUM AMPLITUDE IN METERS FROM THE
UNDISTURBED SEA LEVEL TO THE CREST
IN SOME COASTAL AREAS (PARTICULARLY NEAR THE EPICENTER),
TSUNAMI WAVES MAY BE HIGHER AND/OR ARRIVE EARLIER THAN
ESTIMATED FOR NEARBY FORECAST POINTS.
AUTHORITIES SHOULD BE AWARE OF THIS POSSIBILITY.
THE EVALUATION OF TSUNAMIGENIC POTENTIAL AND ESTIMATED
ARRIVAL TIMES FOR TSUNAMI WAVES MAY ALSO DIFFER FROM
THOSE OF PTWC DUE TO DIFFERENCES IN ESTIMATED EARTHQUAKE
PARAMETERS AND THE TSUNAMI FORECAST MODEL.
AUTHORITIES SHOULD REFER TO EARLIER ARRIVAL TIMES
FOR GREATEST SAFETY.
THIS WILL BE THE FINAL BULLETIN UNLESS CHANGES IN THE POTENTIAL
FOR TSUNAMI GENERATION ARE DEEMED POSSIBLE BASED ON EARTHQUAKE
RE-EVALUATION OR REPORTS INDICATING TSUNAMI OBSERVATION ARE
RECEIVED.
=
TSUNAMI BULLETIN NUMBER 001
ISSUED BY NWPTAC(JMA)
ISSUED AT 0708Z 20 JUL 2025
PART 01 OF 01 PARTS
HYPOCENTRAL PARAMETERS
ORIGIN TIME:0649Z 20 JUL 2025
PRELIMINARY EPICENTER:LAT52.5NORTH LON160.7EAST
OFF EAST COAST OF KAMCHATKA
JAPAN - KURIL ISLANDS - KAMCHATKA PENINSULA
MAG:7.5
EVALUATION
THERE IS A POSSIBILITY OF A DESTRUCTIVE LOCAL TSUNAMI
NEAR THE EPICENTER
THIS BULLETIN IS FOR
EAST COASTS OF KAMCHATKA PENINSULA
ESTIMATED TSUNAMI ARRIVAL TIMES AND WAVE AMPLITUDES
EAST COASTS OF KAMCHATKA PENINSULA
LOCATION COORDINATES ARRIVAL TIME AMPL
PETROPAVLOVSK_K 53.2N 159.6E 0713Z 20 JUL 1-3M
AMPL - MAXIMUM AMPLITUDE IN METERS FROM THE
UNDISTURBED SEA LEVEL TO THE CREST
IN SOME COASTAL AREAS (PARTICULARLY NEAR THE EPICENTER),
TSUNAMI WAVES MAY BE HIGHER AND/OR ARRIVE EARLIER THAN
ESTIMATED FOR NEARBY FORECAST POINTS.
AUTHORITIES SHOULD BE AWARE OF THIS POSSIBILITY.
THE EVALUATION OF TSUNAMIGENIC POTENTIAL AND ESTIMATED
ARRIVAL TIMES FOR TSUNAMI WAVES MAY ALSO DIFFER FROM
THOSE OF PTWC DUE TO DIFFERENCES IN ESTIMATED EARTHQUAKE
PARAMETERS AND THE TSUNAMI FORECAST MODEL.
AUTHORITIES SHOULD REFER TO EARLIER ARRIVAL TIMES
FOR GREATEST SAFETY.
THIS WILL BE THE FINAL BULLETIN UNLESS CHANGES IN THE POTENTIAL
FOR TSUNAMI GENERATION ARE DEEMED POSSIBLE BASED ON EARTHQUAKE
RE-EVALUATION OR REPORTS INDICATING TSUNAMI OBSERVATION ARE
RECEIVED.
=
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WEPA40 RJTD 200734
TSUNAMI BULLETIN NUMBER 002
ISSUED BY NWPTAC(JMA)
ISSUED AT 0734Z 20 JUL 2025
PART 01 OF 01 PARTS
HYPOCENTRAL PARAMETERS (REVISION)
ORIGIN TIME:0649Z 20 JUL 2025
PRELIMINARY EPICENTER:LAT52.5NORTH LON160.7EAST
OFF EAST COAST OF KAMCHATKA
JAPAN - KURIL ISLANDS - KAMCHATKA PENINSULA
MAG:7.3 (MW)
EVALUATION
THERE IS A POSSIBILITY OF A DESTRUCTIVE LOCAL TSUNAMI
NEAR THE EPICENTER
THIS BULLETIN IS FOR
EAST COASTS OF KAMCHATKA PENINSULA
ESTIMATED TSUNAMI ARRIVAL TIMES AND WAVE AMPLITUDES
EAST COASTS OF KAMCHATKA PENINSULA
LOCATION COORDINATES ARRIVAL TIME AMPL
PETROPAVLOVSK_K 53.2N 159.6E 0710Z 20 JUL 1-3M (REVISION)
AMPL - MAXIMUM AMPLITUDE IN METERS FROM THE
UNDISTURBED SEA LEVEL TO THE CREST
IN SOME COASTAL AREAS (PARTICULARLY NEAR THE EPICENTER),
TSUNAMI WAVES MAY BE HIGHER AND/OR ARRIVE EARLIER THAN
ESTIMATED FOR NEARBY FORECAST POINTS.
AUTHORITIES SHOULD BE AWARE OF THIS POSSIBILITY.
THE EVALUATION OF TSUNAMIGENIC POTENTIAL AND ESTIMATED
ARRIVAL TIMES FOR TSUNAMI WAVES MAY ALSO DIFFER FROM
THOSE OF PTWC DUE TO DIFFERENCES IN ESTIMATED EARTHQUAKE
PARAMETERS AND THE TSUNAMI FORECAST MODEL.
AUTHORITIES SHOULD REFER TO EARLIER ARRIVAL TIMES
FOR GREATEST SAFETY.
THIS WILL BE THE FINAL BULLETIN UNLESS CHANGES IN THE POTENTIAL
FOR TSUNAMI GENERATION ARE DEEMED POSSIBLE BASED ON EARTHQUAKE
RE-EVALUATION OR REPORTS INDICATING TSUNAMI OBSERVATION ARE
RECEIVED.
=
TSUNAMI BULLETIN NUMBER 002
ISSUED BY NWPTAC(JMA)
ISSUED AT 0734Z 20 JUL 2025
PART 01 OF 01 PARTS
HYPOCENTRAL PARAMETERS (REVISION)
ORIGIN TIME:0649Z 20 JUL 2025
PRELIMINARY EPICENTER:LAT52.5NORTH LON160.7EAST
OFF EAST COAST OF KAMCHATKA
JAPAN - KURIL ISLANDS - KAMCHATKA PENINSULA
MAG:7.3 (MW)
EVALUATION
THERE IS A POSSIBILITY OF A DESTRUCTIVE LOCAL TSUNAMI
NEAR THE EPICENTER
THIS BULLETIN IS FOR
EAST COASTS OF KAMCHATKA PENINSULA
ESTIMATED TSUNAMI ARRIVAL TIMES AND WAVE AMPLITUDES
EAST COASTS OF KAMCHATKA PENINSULA
LOCATION COORDINATES ARRIVAL TIME AMPL
PETROPAVLOVSK_K 53.2N 159.6E 0710Z 20 JUL 1-3M (REVISION)
AMPL - MAXIMUM AMPLITUDE IN METERS FROM THE
UNDISTURBED SEA LEVEL TO THE CREST
IN SOME COASTAL AREAS (PARTICULARLY NEAR THE EPICENTER),
TSUNAMI WAVES MAY BE HIGHER AND/OR ARRIVE EARLIER THAN
ESTIMATED FOR NEARBY FORECAST POINTS.
AUTHORITIES SHOULD BE AWARE OF THIS POSSIBILITY.
THE EVALUATION OF TSUNAMIGENIC POTENTIAL AND ESTIMATED
ARRIVAL TIMES FOR TSUNAMI WAVES MAY ALSO DIFFER FROM
THOSE OF PTWC DUE TO DIFFERENCES IN ESTIMATED EARTHQUAKE
PARAMETERS AND THE TSUNAMI FORECAST MODEL.
AUTHORITIES SHOULD REFER TO EARLIER ARRIVAL TIMES
FOR GREATEST SAFETY.
THIS WILL BE THE FINAL BULLETIN UNLESS CHANGES IN THE POTENTIAL
FOR TSUNAMI GENERATION ARE DEEMED POSSIBLE BASED ON EARTHQUAKE
RE-EVALUATION OR REPORTS INDICATING TSUNAMI OBSERVATION ARE
RECEIVED.
=
2025年7月20日，俄罗斯堪察加半岛彼得罗巴甫洛夫斯克以东发生7.4级地震，这是由于深度约20公里的逆断层作用造成的。在这次地震的位置，太平洋地区相对于北美板块以约77毫米/年的速度向西北偏西移动。注意，北美板块向西延伸超出北美大陆。地震的位置和运动方向与千岛-堪察加弧俯冲带-板块界面上的断层一致。
虽然通常在地图上绘制为点，但这种规模的地震更恰当地描述为在更大的断层区域上滑动。2025年7月20日地震规模的逆断层事件通常约为60公里乘35公里（长x宽）。
千岛-堪察加弧经常发生中到大地震，在上个世纪，在2025年7月20日地震的250公里范围内，又发生了29次6.5级以上的地震。2025年7月20日的地震位于1952年堪察加半岛9.0级地震东北约73公里处，该地震导致了破坏性的太平洋海啸。
—USGS tectonic summary
虽然通常在地图上绘制为点，但这种规模的地震更恰当地描述为在更大的断层区域上滑动。2025年7月20日地震规模的逆断层事件通常约为60公里乘35公里（长x宽）。
千岛-堪察加弧经常发生中到大地震，在上个世纪，在2025年7月20日地震的250公里范围内，又发生了29次6.5级以上的地震。2025年7月20日的地震位于1952年堪察加半岛9.0级地震东北约73公里处，该地震导致了破坏性的太平洋海啸。
—USGS tectonic summary
TSUNAMI THREAT FORECAST...UPDATED
---------------------------------
* TSUNAMI WAVES REACHING 0.3 TO 1 METERS ABOVE THE TIDE LEVEL
ARE POSSIBLE FOR SOME COASTS OF
RUSSIA.
* TSUNAMI WAVES ARE FORECAST TO BE LESS THAN 0.3 METERS ABOVE
THE TIDE LEVEL FOR THE COASTS OF
HAWAII... JAPAN... MIDWAY ISLAND... AND NORTHWESTERN
HAWAIIAN ISLANDS.
* ACTUAL AMPLITUDES AT THE COAST MAY VARY FROM FORECAST
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
YET BEEN COMPUTED. THE FORECAST WILL BE EXPANDED IF
NECESSARY IN SUBSEQUENT PRODUCTS.
ESTIMATED TIMES OF ARRIVAL
--------------------------
* ESTIMATED TIMES OF ARRIVAL -ETA- OF THE INITIAL TSUNAMI WAVE
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)
------------------------------------------------------------
PETROPAVLOVSK RUSSIA 53.2N 159.6E 0724 07/20
UST KAMCHATSK RUSSIA 56.1N 162.6E 0732 07/20
---------------------------------
* TSUNAMI WAVES REACHING 0.3 TO 1 METERS ABOVE THE TIDE LEVEL
ARE POSSIBLE FOR SOME COASTS OF
RUSSIA.
* TSUNAMI WAVES ARE FORECAST TO BE LESS THAN 0.3 METERS ABOVE
THE TIDE LEVEL FOR THE COASTS OF
HAWAII... JAPAN... MIDWAY ISLAND... AND NORTHWESTERN
HAWAIIAN ISLANDS.
* ACTUAL AMPLITUDES AT THE COAST MAY VARY FROM FORECAST
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
YET BEEN COMPUTED. THE FORECAST WILL BE EXPANDED IF
NECESSARY IN SUBSEQUENT PRODUCTS.
ESTIMATED TIMES OF ARRIVAL
--------------------------
* ESTIMATED TIMES OF ARRIVAL -ETA- OF THE INITIAL TSUNAMI WAVE
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)
------------------------------------------------------------
PETROPAVLOVSK RUSSIA 53.2N 159.6E 0724 07/20
UST KAMCHATSK RUSSIA 56.1N 162.6E 0732 07/20
TSUNAMI THREAT FORECAST...UPDATED --------------------------------- * THERE IS NO LONGER A TSUNAMI THREAT FROM THIS EARTHQUAKE.
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