A powerful magnitude 7.5 (7.1 downgrade USGS) earthquake struck off the Pacific island nation of Vanuatu, the U.S. Geological Survey reported. The earthquake, which struck at 3:55 a.m. local time on Sunday (12:55 p.m. EDT on Saturday), was centered 63 km (39 miles) SSW of PORT-VILA, Efate and was quite shallow, at a depth of 40.6 km (25.2 miles).
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Theoretical calculations are reporting that 33,000 people experienced a very strong shaking, 27,000 people a strong shaking and 62,000 people a moderate shaking. The island closest to the epicenter is Efate with its most important town Port Vila. Port Vila has 35,901 inhabitants). A massive 7.0 aftershock has hit the same area. GDACS calculated tsunami heights based on a 7.4 magnitude. It was recalculated later to 7.0, which is a lot less. The aftershock was reported at a depth of 28.5 km. Radio New Zealand International reports that the Vanuatu National Disaster Management Office says it has received no reports of damage and has cancelled a local tsunami warning advisory.
The Vanuatu Meteorological Service said tsunami waves of 1.05 meter (3.4 feet) arrived on the island of Efate less than an hour after the earthquake. It said there was no damage from the initial waves. (EarthquakeReport)
The Pacific Tsunami Warning Center said the major quake had not triggered a Pacific-wide tsunami. There was no immediate information of any damage or casualties, but when on land quakes of this magnitude can cause widespread and heavy damage. The quake was followed by a swarm of aftershock of magnitudes 5.6, 5.9, 5.1, 5.2, 7.0, 5.0, 4.9, 5.0, 5.0, 5.6, 5.2, 5.2.
The Vanuatu archipelago is located on the so-called “Ring of Fire,” one of the most seismically active regions in the world. Port-Vila is the capital of Vanuatu and has an estimated population of 40,000 people. After a flurry of aftershocks, a second 7.0 earthquake stuck the same region at a depth of 2 km.
