Note: The map shows the area with a shaking intensity of 4 or greater, which the USGS defines as "light," although the earthquake may be felt outside the areas shown. The New York Times
A strong earthquake measuring 7.3 on the Richter scale struck the Coral Sea on Tuesday, the US Geological Survey said.
The earthquake created a tsunami threat for parts of Vanuatu, according to US Tsunami Warning Systemwhich is part of the National Weather Service.
The quake struck at 12:47 a.m. ET, about 19 miles west of Port Vila, Vanuatu, the agency said.
USGS data previously reported the magnitude was 7.4 degrees.
As seismologists review the available data, they may revise the earthquake's reported magnitude. Additional information gathered about the earthquake may also prompt USGS scientists to update the map of the tremor's magnitude.
Aftershocks in the region
An aftershock is usually a smaller earthquake that follows a larger one in the same general area. Aftershocks are typically small adjustments along the part of the fault that slipped at the time of the initial earthquake.
Earthquakes and aftershocks at 100 miles
Aftershocks can occur days, weeks or even years after the first earthquake. These events can be of equal or greater magnitude to the initial earthquake and can continue to affect already damaged locations.
Source: US Geological Survey | Notes: Shaking categories are based on Modified Mercalli Intensity scale. When aftershock data are available, the corresponding maps and charts include earthquakes within 100 miles and seven days of the initial earthquake. All times above are Vanuatu time. The tremor data is as of Monday, December 16 at 9:01 PM Eastern. Aftershock data is as of Monday, December 16 at 9:32 PM Eastern.
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