Magnitude 4.6 Earthquake of San Martin, Argentina 2015-04-12

2015-04-12 07:28:11 (UTC) :East of San Martin, Argentina

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Magnitude : 4.6

Event Time: Time and Date Starting of Earthquake Rupture 

• 2015-04-12 07:28:11 (UTC)

Earthquake data:

Location : Position of Epicenter 

33.036°S 67.502°W

Depth : Depth of starting Rupture 

173.3 km

Region : San Martin, Argentina

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

a) 90km (56mi) E of San Martin, Argentina

b) 112km (70mi) WNW of San Luis, Argentina

c) 112km (70mi) W of La Punta, Argentina

d) 124km (77mi) E of Mendoza, Argentina

e) 296km (184mi) E of Santiago, Chile

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	4.6 mb	± 0.0
Location	33.036°S 67.502°W	± 8.6 km
Depth	173.3 km	± 6.8
Number of Phase Applied1	229
Minimum Distance2	199.37 km (1.79°)
Travel Time Residual3	0.80 sec
Azimuthal Gap4	48°

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)