Magnitude 4.7 Earthquake of Arica, Chile 2014-09-18

2014-09-18 03:42:53 UTC : Arica, Chile EARTHQUAKE

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Magnitude: 4.7

Event Time: Time and Date Starting of Earthquake Rupture 

1. 2014-09-18 03:42:53 UTC

1. 2014-09-18 00:42:53 UTC-03:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

18.808°S 70.191°W

Depth : Depth of starting Rupture 

89.6km (55.7mi)

Region : Arica, Chile

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

a)  38km (24mi) SSE of Arica, Chile

b)  89km (55mi) S of Tacna, Peru

c)  156km (97mi) N of Iquique, Chile

d)  177km (110mi) SE of Ilo, Peru

1. 
   

e)  334km (208mi) SW of La Paz, Bolivia

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	4.7 mb	± 0.06
Location	18.808°S, 70.191°W	--
Depth	89.6 km	± 5.6 km
Number of Phase Applied1	46
Minimum Distance2	25.8 km (0.23°)
Travel Time Residual3	1.07 sec
Azimuthal Gap4	141°

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)