Magnitude 6.8 - TONGA

2011 September 22 23:07:04 UTC

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Earthquake Details

• This event has been reviewed by a seismologist.

Magnitude	6.8 (Preliminary magnitude — update expected within 15 minutes)
Date-Time	Thursday, September 22, 2011 at 23:07:04 UTC Friday, September 23, 2011 at 12:07:04 PM at epicenter
Location	15.000°S, 174.800°W
Depth	41 km (25.5 miles) set by location program
Region	TONGA
Distances	355 km (220 miles) WSW (248°) from APIA, Samoa 415 km (258 miles) NNW (348°) from Neiafu, Tonga 449 km (279 miles) W (259°) from PAGO PAGO, American Samoa 2706 km (1682 miles) W (272°) from PAPEETE, Tahiti, French Polynesia
Location Uncertainty	Error estimate not available
Parameters	NST= 18, Nph= 18, Dmin=375.3 km, Rmss=1.13 sec, Gp= 86°, M-type="moment" magnitude from initial P wave (tsuboi method) (Mi/Mwp), Version=1
Source	West Coast and Alaska Tsunami Warning Center/NOAA/NWS