[link to earthquake.usgs.gov]
Magnitude
5.8
Friday, February 15, 2013 at 03:02:23 UTC
Depth
71.7 km (44.6 miles)
Region
TONGA

It's about 50 km from Tofua volcano
[link to www.volcano.si.edu]
Volcano Type: Caldera
Volcano Status: Historical
Last Known Eruption: 2011
...The volcano's summit contains a 5-km-wide caldera whose walls drop steeply about 500 m. Three post-caldera cones were constructed at the northern end of a cold fresh-water caldera lake, whose surface lies only 30 m above sea level...