Magnitude 4.7 Earthquake of Vaini, Tonga 2014-07-17

2014-07-17 10:58:27 UTC : Vaini, Tonga EARTHQUAKE

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Magnitude: 4.7

Event Time: Time and Date Starting of Earthquake Rupture 

1. 2014-07-17 11:08:16 UTC

1. 2014-07-16 23:08:16 UTC-12:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

21.593°S 176.030°W

Depth : Depth of starting Rupture 

108.9km (67.7mi)

Region : Vaini, Tonga

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

a)  96km (60mi) WSW of Vaini, Tonga

b)  100km (62mi) WSW of Nuku`alofa, Tonga

c)  693km (431mi) SE of Suva, Fiji

1. 
   

d)  749km (465mi) SE of Lambasa, Fiji

e)  805km (500mi) ESE of Nadi, Fiji

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	4.7 mb	± 0.05
Location	21.593°S, 176.030°W	--
Depth	108.9 km	± 6.1 km
Number of Phase Applied1	79
Minimum Distance2	695.7 km (6.25°)
Travel Time Residual3	1.44 sec
Azimuthal Gap4	43°

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)