Magnitude 4.6 Earthquake of Atocha, Bolivia 2015-04-19

2015-04-19 02:03:17 (UTC) :South-West of Atocha, Bolivia

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Magnitude : 4.6

Event Time: Time and Date Starting of Earthquake Rupture 

• 2015-04-19 02:03:17 (UTC)

Earthquake data:

Location : Position of Epicenter 

21.631°S 66.892°W

Depth : Depth of starting Rupture 

230.8 km

Region : Atocha, Bolivia

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

a) 103km (64mi) SW of Atocha, Bolivia

b) 123km (76mi) W of Tupiza, Bolivia

c) 129km (80mi) S of Uyuni, Bolivia

d) 143km (89mi) WNW of Villazon, Bolivia

e) 583km (362mi) SSE of La Paz, Bolivia

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	4.6 mb	± 0.1
Location	21.631°S 66.892°W	± 5.6 km
Depth	230.8 km	± 6.6
Number of Phase Applied1	69
Minimum Distance2	234.99 km (2.11°)
Travel Time Residual3	1.50 sec
Azimuthal Gap4	41°

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)