Hawaii County Civil Defense audio message
TSUNAMI MESSAGE NUMBER 17 NWS PACIFIC TSUNAMI WARNING CENTER EWA BEACH HI 1826 UTC FRI SEP 8 2017 ...PTWC FINAL TSUNAMI THREAT MESSAGE... THE TSUNAMI FORECAST IS UNCHANGED IN THIS MESSAGE. PRELIMINARY EARTHQUAKE PARAMETERS --------------------------------- * MAGNITUDE 8.2 * ORIGIN TIME 0449 UTC SEP 8 2017 * COORDINATES 14.9 NORTH 94.0 WEST * DEPTH 33 KM / 20 MILES * LOCATION OFF THE COAST OF CHIAPAS MEXICO EVALUATION ---------- * AN EARTHQUAKE WITH A PRELIMINARY MAGNITUDE OF 8.2 OCCURRED OFF THE COAST OF CHIAPAS, MEXICO AT 0449 UTC ON FRIDAY SEPTEMBER 8 2017. * BASED ON ALL AVAILABLE DATA... THE TSUNAMI THREAT FROM THIS EARTHQUAKE HAS NOW PASSED. TSUNAMI THREAT FORECAST...UPDATED --------------------------------- * THE TSUNAMI THREAT HAS NOW LARGELY PASSED. RECOMMENDED ACTIONS ------------------- * GOVERNMENT AGENCIES RESPONSIBLE FOR ANY IMPACTED COASTAL AREAS SHOULD MONITOR CONDITIONS AT THE COAST TO DETERMINE IF AND WHEN IT IS SAFE TO RESUME NORMAL ACTIVITIES. * PERSONS LOCATED NEAR IMPACTED COASTAL AREAS SHOULD STAY ALERT FOR INFORMATION AND FOLLOW INSTRUCTIONS FROM LOCAL AUTHORITIES. * REMAIN OBSERVANT AND EXERCISE NORMAL CAUTION NEAR THE SEA. POTENTIAL IMPACTS ----------------- * MINOR SEA LEVEL FLUCTUATIONS OF UP TO 0.3 METERS ABOVE AND BELOW THE NORMAL TIDE MAY CONTINUE OVER THE NEXT FEW HOURS. 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. GAUGE TIME OF MAXIMUM WAVE COORDINATES MEASURE TSUNAMI PERIOD GAUGE LOCATION LAT LON (UTC) HEIGHT (MIN) ------------------------------------------------------------- APIA UPOLU WS 13.8S 171.8W 1759 0.22M/ 0.7FT 14 PAGO PAGO AS 14.3S 170.7W 1726 0.12M/ 0.4FT 22 PAPEETE TAHITI 17.5S 149.6W 1508 0.04M/ 0.1FT 18 QUEPOS CR 9.4N 84.2W 1345 0.17M/ 0.6FT 88 LA LIBERTAD SV 13.5N 89.3W 1137 0.19M/ 0.6FT 74 ACAJUTLA SV 13.6N 89.8W 1537 0.47M/ 1.5FT 20 CHIAPAS MX 14.7N 92.4W 0949 1.75M/ 5.8FT 32 KAHULUI MAUI 20.9N 156.5W 1413 0.18M/ 0.6FT 18 HILO HAWAII 19.7N 155.1W 1357 0.17M/ 0.6FT 18 HIVA OA MARQUESAS 9.8S 139.0W 1341 0.18M/ 0.6FT 08 NUKU HIVA MARQUESAS 8.9S 140.1W 1306 0.20M/ 0.7FT 14 DART 32412 18.0S 86.4W 1020 0.01M/ 0.0FT 26 EASTER CL 27.2S 109.4W 1151 0.29M/ 0.9FT 06 DART 32413 7.4S 93.5W 0843 0.02M/ 0.1FT 24 LAZARO CARDENAS MX 17.9N 102.2W 0646 0.20M/ 0.6FT 58 DART 43413 10.8N 100.1W 0558 0.07M/ 0.2FT 10 SANTACRUZ GALAPAGOS 0.7S 90.3W 0835 0.15M/ 0.5FT 20 ZIHUATANEJO MX 17.6N 101.6W 0627 0.21M/ 0.7FT 50 BALTRA GALAPAGS EC 0.4S 90.3W 0806 0.17M/ 0.5FT 26 MANZANILLO MX 19.1N 104.3W 0710 0.24M/ 0.8FT 38 ACAPULCO MX 16.8N 99.9W 0635 0.72M/ 2.4FT 24 DART 32411 5.0N 90.8W 0642 0.03M/ 0.1FT 26 SALINA CRUZ MX 16.2N 95.2W 0635 1.01M/ 3.3FT 46 PUERTO ANGEL MX 15.7N 96.5W 0517 0.29M/ 1.0FT 24 HUATULCO MX 15.8N 96.1W 0514 0.69M/ 2.3FT 12 NEXT UPDATE AND ADDITIONAL INFORMATION -------------------------------------- * THIS WILL BE THE FINAL STATEMENT ISSUED FOR THIS EVENT UNLESS NEW INFORMATION IS 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/EARTHQUAKES -ALL LOWER CASE-. * FURTHER INFORMATION ABOUT THIS EVENT MAY BE FOUND AT PTWC.WEATHER.GOV AND 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 PTWC.WEATHER.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 NTWC.ARH.NOAA.GOV.
An animation of the energy from the magnitude of 8.2 earthquake occurred off the coast of Chiapas, Mexico at 06:49 p.m. HST on Thursday, September 7, 2017. Animation courtesy of European Commission JRC.
USGS: How large does an earthquake have to be to cause a tsunami?
Magnitudes below 6.5
Earthquakes of this magnitude are very unlikely to trigger a tsunami.Magnitudes between 6.5 and 7.5
Earthquakes of this size do not usually produce destructive tsunamis. However, small sea level changes may be observed in the vicinity of the epicenter. Tsunamis capable of producing damage or casualties are rare in this magnitude range but have occurred due to secondary effects such as landslides or submarine slumps.Magnitudes between 7.6 and 7.8
Earthquakes of this size may produce destructive tsunamis especially near the epicenter; at greater distances small sea level changes may be observed. Tsunamis capable of producing damage at great distances are rare in the magnitude range.Magnitude 7.9 and greater
Destructive local tsunamis are possible near the epicenter, and significant sea level changes and damage may occur in a broader region.Note that with a magnitude 9.0 earthquake, the probability of an aftershock with a magnitude exceeding 7.5 is not negligible. To date, the largest aftershock recorded has been magnitude 7.1 that did not produce a damaging tsunami.
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