Magnitude 4.2 Earthquake of Ilo, Peru 2014-07-24

2014-07-24 05:21:56 UTC : Ilo, Peru EARTHQUAKE

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Magnitude: 4.2

Event Time: Time and Date Starting of Earthquake Rupture 

1. 2014-07-24 05:21:56 UTC

1. 2014-07-24 00:21:56 UTC-05:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

18.351°S 71.426°W

Depth : Depth of starting Rupture 

28.5km (17.7mi)

Region : Ilo, Peru

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

a)  79km (49mi) S of Ilo, Peru

b)  119km (74mi) W of Arica, Chile

c)  130km (81mi) WSW of Tacna, Peru

d)  138km (86mi) SSW of Moquegua, Peru

e)  403km (250mi) WSW of La Paz, Bolivia

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	4.2 mwr	± 0.05
Location	18.351°S, 71.426°W	--
Depth	28.5 km	± 4.8 km
Number of Phase Applied1	35
Minimum Distance2	114.5 km (1.03°)
Travel Time Residual3	0.87 sec
Azimuthal Gap4	155°

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)