Magnitude 4.2 Earthquake of Calama, Chile 2014-07-23

2014-07-23 21:00:46 UTC : Calama, Chile EARTHQUAKE

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Magnitude: 4.2

Event Time: Time and Date Starting of Earthquake Rupture 

1. 2014-07-23 21:00:46 UTC

1. 2014-07-23 17:00:46 UTC-04:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

21.174°S 68.754°W

Depth : Depth of starting Rupture 

135.0km (83.9mi)

Region : Calama, Chile

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

a)  144km (89mi) N of Calama, Chile

b)  179km (111mi) SE of Iquique, Chile

c)  180km (112mi) NE of Tocopilla, Chile

d)  212km (132mi) WSW of Colchani, Bolivia

e)  521km (324mi) S of La Paz, Bolivia

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	4.2 mb	± 0.20
Location	21.174°S, 68.754°W	--
Depth	135.0 km	± 6.2 km
Number of Phase Applied1	47
Minimum Distance2	77.6 km (0.70°)
Travel Time Residual3	0.90 sec
Azimuthal Gap4	46°

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)