Magnitude 4.8 Earthquake of Iquique, Chile 2014-07-21

2014-07-21 00:21:26 UTC : Iquique, Chile EARTHQUAKE

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Magnitude: 4.8

Event Time: Time and Date Starting of Earthquake Rupture 

1. 2014-07-21 00:21:26 UTC

1. 2014-07-20 19:21:26 UTC-05:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

20.131°S 70.632°W

Depth : Depth of starting Rupture 

21.8km (13.6mi)

Region : Iquique, Chile

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

a)  52km (32mi) W of Iquique, Chile

b)  186km (116mi) S of Arica, Chile

c)  221km (137mi) NNW of Tocopilla, Chile

d)  238km (148mi) S of Tacna, Peru

e)  479km (298mi) SSW of La Paz, Bolivia

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	4.8 mb	± 0.04
Location	20.131°S, 70.632°W	--
Depth	21.8 km	± 3.7 km
Number of Phase Applied1	252
Minimum Distance2	67.3 km (0.61°)
Travel Time Residual3	0.85 sec
Azimuthal Gap4	96°

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)