ZCZC WEGM40 PHEB 300152 TSUGUM GUZ001>004-300352- /O.CON.PHEB.TS.Y.0001.000000T0000Z-000000T0000Z/ BULLETIN TSUNAMI MESSAGE NUMBER 4 NWS PACIFIC TSUNAMI WARNING CENTER HONOLULU HI 1152 AM CHST WED JUL 30 2025 ...THE TSUNAMI ADVISORY CONTINUES IN EFFECT FOR GUAM AND CNMI... AUDIENCE -------- EMERGENCY MANAGERS... MEDIA... GENERAL PUBLIC EVALUATION ---------- * AN EARTHQUAKE WITH A PRELIMINARY MAGNITUDE OF 8.7 OCCURRED OFF THE EAST COAST OF KAMCHATKA, RUSSIA AT 925 AM CHST ON WEDNESDAY JULY 30 2025. * BASED ON ALL AVAILABLE DATA... THERE IS A THREAT TO GUAM... ROTA... TINIAN AND SAIPAN OF SEA LEVEL FLUCTUATIONS AND STRONG OCEAN CURRENTS THAT COULD BE A HAZARD ALONG BEACHES... IN HARBORS... AND IN COASTAL WATERS. * THE EARLIEST ESTIMATED TIME THAT HAZARDOUS SEA LEVEL FLUCTUATIONS AND STRONG OCEAN CURRENTS MAY BEGIN IN GUAM... ROTA... TINIAN OR SAIPAN IS 237 PM CHST ON WEDNESDAY JULY 30 2025 RECOMMENDED ACTIONS ------------------- * PERSONS IN THE OCEAN SHOULD GET OUT OF THE WATER. PERSONS NEAR THE OCEAN SHOULD MOVE AWAY FROM BEACHES AND HARBORS. * FOLLOW INSTRUCTIONS AS THEY ARE GIVEN BY GOVERNMENT AGENCIES. ESTIMATED TIMES OF ARRIVAL -------------------------- * ESTIMATED TIMES OF ARRIVAL -ETA- OF THE INITIAL TSUNAMI WAVE 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(CHST) ---------------------------------------------------------- MAGICIENNE BAY SAIPAN 15.1N 145.8E 237 PM 07/30 OBYAN SAIPAN 15.1N 145.7E 237 PM 07/30 WING BEACH SAIPAN 15.3N 145.8E 237 PM 07/30 GARAPAN SAIPAN 15.2N 145.7E 240 PM 07/30 LONG BEACH TINIAN 15.0N 145.7E 240 PM 07/30 CHULU BEACH TINIAN 15.1N 145.6E 244 PM 07/30 MOCHON BEACH ROTA 14.2N 145.3E 245 PM 07/30 ARATSU BAY ROTA 14.1N 145.2E 246 PM 07/30 SAN JOSE TINIAN 15.0N 145.6E 247 PM 07/30 SONGSONG ROTA 14.1N 145.1E 249 PM 07/30 PATI POINT GUAM 13.6N 145.0E 251 PM 07/30 PAGO BAY GUAM 13.4N 144.8E 253 PM 07/30 INARAJAN GUAM 13.3N 144.8E 253 PM 07/30 APRA HARBOR GUAM 13.5N 144.6E 257 PM 07/30 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 TIDE LEVEL. GAUGE TIME OF MAXIMUM WAVE COORDINATES MEASURE TSUNAMI PERIOD GAUGE LOCATION LAT LON (CHST) HEIGHT (MIN) ------------------------------------------------------------- DART 21414 49.0N 178.2E 203 PM 0.9FT/ 0.3M 32 DART 21416 48.1N 163.5E 103 PM 3.0FT/ 0.9M 24 POTENTIAL IMPACTS ----------------- * SEA LEVEL FLUCTUATIONS THAT ARE GENERALLY NO MORE THAN 3 FEET ABOVE AND BELOW THE TIDE LEVEL. * MINOR FLOODING OF BEACH AND HARBOR AREAS. * STRONG AND UNUSUAL OCEAN CURRENTS IN HARBORS... BAYS... AND OTHER NEAR SHORE WATERS. * THE HAZARD IS FORECAST TO BEGIN AROUND 237 PM CHST ON WEDNESDAY JULY 30 AND IT CAN PERSIST FOR MANY HOURS OR LONGER. PRELIMINARY EARTHQUAKE PARAMETERS --------------------------------- * MAGNITUDE 8.7 * ORIGIN TIME 925 AM CHST JUL 30 2025 * COORDINATES 52.2 NORTH 160.0 EAST * DEPTH 46 MILES * LOCATION OFF THE EAST COAST OF KAMCHATKA RUSSIA NEXT UPDATE AND ADDITIONAL INFORMATION -------------------------------------- * THE NEXT MESSAGE WILL BE ISSUED IN ONE HOUR... OR SOONER IF THE SITUATION WARRANTS. * FURTHER INFORMATION ABOUT THIS EVENT MAY BE FOUND ON THE 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. $$ NNNN