Magnitude 7.1 - VANUATU
2012 February 02 13:34:40 UTC
- This event has been reviewed by a seismologist.
|Depth||23.1 km (14.4 miles)|
|Distances||124 km (77 miles) W of PORT-VILA, Efate, Vanuatu|
251 km (155 miles) S of Luganville, Espiritu Santo, Vanuatu
294 km (182 miles) NW of Isangel, Tanna, Vanuatu
1803 km (1120 miles) ENE of BRISBANE, Queensland, Australia
|Location Uncertainty||horizontal +/- 13.8 km (8.6 miles); depth +/- 2.7 km (1.7 miles)|
|Parameters||NST=551, Nph=561, Dmin=482 km, Rmss=1.23 sec, Gp= 14°,|
M-type="moment" magnitude from initial P wave (tsuboi method) (Mi/Mwp), Version=C
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The February 2, 2012 earthquake near Vanuatu in the southwest Pacific Ocean occurred as a result of oblique-normal faulting within the lithosphere of the Australia plate. The earthquake epicenter is located just 15 km to the west of the New Hebrides Trench, the bathymetric expression of the boundary between the Australia and Pacific plates, where lithosphere of the Australia plate subducts into the mantle beneath the North Fiji Basin. At the location of this earthquake, the Australia plate moves east-northeast with respect to the Pacific plate at a velocity of approximately 84 mm/yr.
Vanuatu region is familiar with earthquakes of this size â about a dozen earthquakes of M 7 or larger have occurred within 250 km of todayâs event over the past 30 years. However, they generally occur on the megathrust interface to the east, and few have been outboard of the trench. A magnitude 7.3 normal faulting earthquake did occur to the west of the New Hebrides Trench, about 225 km to the south of todayâs event, on Christmas Day in 2010.
Scientific & Technical Information
The earthquake locations and magnitudes cited in NOAA tsunami statements and bulletins are preliminary and are superseded by USGS locations and magnitudes computed using more extensive data sets.
General Tsunami Information
- Preliminary Earthquake Report
- U.S. Geological Survey, National Earthquake Information Center:
World Data Center for Seismology, Denver