Monday, August 11, 2014

Magnitude 5.1 Earthquake of Neiafu, Tonga 2014-08-11

2014-08-11 11:09:07 UTC : Neiafu, Tonga EARTHQUAKE

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Magnitude: 5.1


Event Time: Time and Date Starting of Earthquake Rupture 


  1. 2014-08-11 11:09:07 UTC

  1. 2014-08-10 23:09:07 UTC-12:00 at epicenter


Earthquake data:

Location : Position of Epicenter 

17.727°S 172.812°W

Depth : Depth of starting Rupture 

42.3km (26.3mi)


Region : Neiafu, Tonga


Magnitude 5.1 Earthquake of Neiafu, Tonga 2014-08-11




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

a)  160km (99mi) NE of Neiafu, Tonga

b)  436km (271mi) SSW of Tafuna, American Samoa

c)  443km (275mi) SSW of Pago Pago, American Samoa

d)  
445km (277mi) SSW of Apia, Samoa


e)  452km (281mi) NE of Nuku`alofa, Tonga

Location Uncertainty: 
Parameter
Value
Uncertainty
Magnitude
5.1 mb
± 0.06
Location
17.727°S, 172.812°W
--
Depth
42.3 km
± 5.5 km
Number of Phase Applied1
43

Minimum Distance2
969.0 km (8.71°)

Travel Time Residual3
1.20 sec

Azimuthal Gap4
97°

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)

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