Magnitude 4.8 Earthquake of Neiafu, Tonga 2014-09-06

2014-09-06 20:41:50 UTC : Neiafu, Tonga EARTHQUAKE

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Magnitude : 4.8

Event Time: Time and Date Starting of Earthquake Rupture 

1. 2014-09-06 20:41:50 UTC

1. 2014-09-06 08:41:50 UTC-12:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

18.009°S 172.567°W

Depth : Depth of starting Rupture 

21.8km (13.5mi)

Region : Neiafu, Tonga

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

a)  165km (103mi) ENE of Neiafu, Tonga

b)  442km (275mi) NE of Nuku`alofa, Tonga

c)  451km (280mi) SSW of Tafuna, American Samoa

1. 
   

d)  458km (285mi) SSW of Pago Pago, American Samoa

e)  469km (291mi) S of Apia, Samoa

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	4.8 mb	± 0.06
Location	18.009°S, 172.568°W	--
Depth	21.8 km	± 5.1 km
Number of Phase Applied1	70
Minimum Distance2	302.8 km (2.72°)
Travel Time Residual3	0.91 sec
Azimuthal Gap4	58°

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)