Magnitude 6.0 Earthquake of Ohonua, Tonga 2014-09-04

2014-09-04 05:33:46 UTC : Ohonua, Tonga EARTHQUAKE

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Magnitude : 6.0

Event Time: Time and Date Starting of Earthquake Rupture 

1. 2014-09-04 05:33:46 UTC

1. 2014-09-03 17:33:46 UTC-12:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

21.396°S 173.258°W 

Depth : Depth of starting Rupture 

11.8km (7.4mi)

Region : Ohonua, Tonga

Directions and Distances :Directions and Distances from Geographical Reference in Close Proximity Which can be effected by Location Uncertainty

a)  175km (109mi) E of `Ohonua, Tonga

b)  203km (126mi) E of Nuku`alofa, Tonga

c)  826km (513mi) SSW of Tafuna, American Samoa

1. 
   

d)  833km (518mi) SSW of Pago Pago, American Samoa

e)  851km (529mi) S of Apia, Samoa

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	6.0 mwb	± 0.07
Location	21.397°S, 173.258°W	--
Depth	11.8 km	± 3.9 km
Number of Phase Applied1	93
Minimum Distance2	432.6 km (3.89°)
Travel Time Residual3	1.38 sec
Azimuthal Gap4	28°

¹Number of phase Applied: 

In determining location of hypocenter, applied number of observations on P waves and S waves. The greater the more accurate prediction of EQ.

²Minimum Distance:

 Horizontal distance of nearest Station measured in Km from epicenter. The smaller the more accuracy in prediction of depth of EQ.

³Travel Time Residual:

 A way of measurement of fit of arrival time observed to arrival time predicted for particular location. The smaller the better fit of data.

⁴Azimuthal Gap: 

Expressed in degree; the smaller the smaller the error in horizontal positioning of EQ. Large uncertainty is considered when exceeds 180° (both depth and location)