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2011 October 21 17:57:16 UTC

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Earthquake Details

  • This event has been reviewed by a seismologist.
Location28.998°S, 176.183°W
Depth32.9 km (20.4 miles)
Distances169 km (105 miles) E of Raoul Island, Kermadec Islands
375 km (233 miles) NE of L'Esperance Rock, Kermadec Islands
877 km (544 miles) S of NUKU`ALOFA, Tonga
1215 km (754 miles) NE of Auckland, New Zealand
Location Uncertaintyhorizontal +/- 14.1 km (8.8 miles); depth +/- 2.7 km (1.7 miles)
ParametersNST=741, Nph=742, Dmin=172.5 km, Rmss=0.68 sec, Gp= 11°,
M-type="moment" magnitude from initial P wave (tsuboi method) (Mi/Mwp), Version=8
  • Magnitude: USGS NEIC (WDCS-D)
    Location: USGS NEIC (WDCS-D)
Event IDusb0006b6p
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Earthquake Summary

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Tectonic Summary

The October 21, 2011 Kermadec Islands region earthquake occurred near the Kermadec Trench where the Pacific Plate begins its descent into the mantle beneath the eastern edge of the Australian Plate. At the latitude of this earthquake, the Pacific Plate is converging with Australia in a westward direction at a velocity of approximately 61 mm/yr. The preliminary mechanism and depth of the event suggest it ruptured a reverse fault within the oceanic lithosphere of the Pacific Plate; the initial location indicate a source slightly to the east of the trench, outboard (seaward) of the subduction zone itself, and thus not on the thrust interface between the Pacific and Australian plates.

The October 21 earthquake struck in an oceanic region with few nearby populations, approximately 500 km south of Tonga and 700 km north of New Zealand. This region of the Tonga-Kermadec subduction zone experiences reasonably high levels of seismic activity, with nearly 50 events of M 6.5 and above over the past 38 years, and 5 greater than M 7.5. Two of these, M 7.8 and M8.2 earthquakes on the same day in 1976, occurred just over 100 km west-northwest of todays event; an M7.8 event in 1978 struck nearly 250 km to the southwest, and an M 8.3 event occurred in October 1986, about 80 km to the north. None of these events have recorded damage or casualties.

In July of this year, a M 7.6 event occurred approximately 45 km to the south-southwest of the October 21 earthquake, breaking a normal fault within the subducting Pacific plate also very close to the Kermadec Trench. This event was notable because it triggered a large number of thrust-faulting aftershocks to the west of the plate boundary, on or close to the interface between the Pacific and Australian plates. The October 21 earthquake may be related to that aftershock sequence.

Tsunami 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