Magnitude 4.7 Earthquake of San Antonio, Chile 2014-08-11

2014-08-11 04:22:30 UTC : San Antonio, Chile EARTHQUAKE

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Magnitude: 4.7

Event Time: Time and Date Starting of Earthquake Rupture 

1. 2014-08-11 04:22:30 UTC

1. 2014-08-10 23:22:30 UTC-05:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

33.586°S 72.057°W

Depth : Depth of starting Rupture 

22.8km (14.2mi)

Region : San Antonio, Chile

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

a)  40km (25mi) W of San Antonio, Chile

b)  42km (26mi) W of Cartagena, Chile

c)  72km (45mi) SSW of Valparaiso, Chile

d)  78km (48mi) SW of Vina del Mar, Chile

e)  131km (81mi) W of Santiago, Chile

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	4.7 mb	± 0.15
Location	33.586°S, 72.057°W	--
Depth	22.8 km	± 3.9 km
Number of Phase Applied1	46
Minimum Distance2	73.7 km (0.66°)
Travel Time Residual3	0.51 sec
Azimuthal Gap4	74°

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)