Magnitude 4.4 Earthquake of Fort St. John, Canada 2013 May 28

2013-05-28 04:36:09 UTC : Fort St. John, Canada EARTHQUAKE

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Magnitude: 4.4

Event Time: Time and Date Starting of Earthquake Rupture 

2013-05-28 04:36:09 UTC

2013-05-27 21:36:09 UTC-07:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

56.198°N 120.571°W

Depth : Depth of starting Rupture 

5.0km (3.1mi)

Region : Fort St. John, Canada

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

a) 18km (11mi) ESE of Fort St. John, Canada

b) 52km (32mi) NNW of Dawson Creek, Canada

c) 159km (99mi) NW of Grande Prairie, Canada

d) 289km (180mi) NNE of Prince George, Canada

e) 542km (337mi) NW of Edmonton, Canada

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	4.4 mb	± 0.05
Location	56.198°N, 120.571°W	± 30.4 km
Depth	5.0 km	± 3.0 km
Number of Phase Applied1	35
Minimum Distance2	1692.0 km (15.20°)
Travel Time Residual3	1.25 sec
Azimuthal Gap4	130°

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)