Magnitude 4.0 Earthquake of Iquique, Chile 2014-08-17

2014-08-17 18:30:27 UTC : Iquique, Chile EARTHQUAKE

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Magnitude: 4.0

Event Time: Time and Date Starting of Earthquake Rupture 

1. 2014-08-17 18:30:27 UTC

1. 2014-08-17 14:30:27 UTC-04:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

20.154°S 70.362°W

Depth : Depth of starting Rupture 

28.2km (17.5mi)

Region : Iquique, Chile

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

a)  24km (15mi) WNW of Iquique, Chile

b) 185km (115mi) S of Arica, Chile

c)  215km (134mi) N of Tocopilla, Chile

d)  238km (148mi) S of Tacna, Peru

e)  467km (290mi) SSW of La Paz, Bolivia

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	4.0 mwr	± 0.05
Location	20.154°S, 70.362°W	--
Depth	28.2 km	± 6.9 km
Number of Phase Applied1	27
Minimum Distance2	49.3 km (0.44°)
Travel Time Residual3	0.76 sec
Azimuthal Gap4	171°

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)