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.

  • Saturday, April 28, 2012 at 10:08:07 UTC
  • Saturday, April 28, 2012 at 11:08:07 PM at epicenter
Location18.643°S, 174.725°W
Depth129.4 km (80.4 miles)
Distances78 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 Uncertaintyhorizontal +/- 15 km (9.3 miles); depth +/- 4.6 km (2.9 miles)
ParametersNST=454, Nph=457, Dmin=611.1 km, Rmss=0.81 sec, Gp= 22°,
M-type=centroid moment magnitude (Mw), Version=9
  • Magnitude: USGS NEIC (WDCS-D)
    Location: USGS NEIC (WDCS-D)
Event IDusc0009e33

Historical seismicity – M7 and greater since 1900

Featured image: Google Earth + USGS


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