Strong and deep M6.4 earthquake struck Tonga region

Strong and deep earthquake with magnitude 6.4 struck Tonga region on April 28, 2012. Epicenter was located 78 km (48 miles) W of Neiafu, Tonga (18.643°S, 174.725°W). Recorded depth was 129.4 km (80.4 miles) by USGS.

Earthquake was harmless for shaking damage and tsunami as the depth and source of earthquake is unable to generate strong shaking or tsunami waves. Additionaly, the people living in this region are familiar with strong shaking.

Magnitude	6.7
Date-Time	Saturday, April 28, 2012 at 10:08:07 UTC Saturday, April 28, 2012 at 11:08:07 PM at epicenter
Location	18.643°S, 174.725°W
Depth	129.4 km (80.4 miles)
Region	TONGA
Distances	78 km (48 miles) W of Neiafu, Tonga 280 km (173 miles) N of NUKU`ALOFA, Tonga 315 km (195 miles) SSW of Hihifo, Tonga 2266 km (1408 miles) NNE of Auckland, New Zealand
Location Uncertainty	horizontal +/- 15 km (9.3 miles); depth +/- 4.6 km (2.9 miles)
Parameters	NST=454, Nph=457, Dmin=611.1 km, Rmss=0.81 sec, Gp= 22°, M-type=centroid moment magnitude (Mw), Version=9
Source	Magnitude: USGS NEIC (WDCS-D) Location: USGS NEIC (WDCS-D)
Event ID	usc0009e33