Magnitude 4.9 Earthquake of Fort Washakie, Wyoming USA 2013 September 21

2013-09-21 13:16:30 UTC : Fort Washakie, Wyoming USA EARTHQUAKE

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Magnitude: 4.9

Event Time: Time and Date Starting of Earthquake Rupture 

1. 2013-09-21 13:16:30 UTC

1. 2013-09-21 07:16:30 UTC-06:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

43.008°N 109.079°W

Depth : Depth of starting Rupture 

5.0km (3.1mi)

Region : Fort Washakie, Wyoming

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

a) 16km (10mi) W of Fort Washakie, Wyoming

b) 57km (35mi) W of Riverton, Wyoming

c) 158km (98mi) N of Rock Springs, Wyoming

d) 167km (104mi) N of Green River, Wyoming

e) 341km (212mi) NE of Salt Lake City, Utah

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	4.9 mb	± 0.05
Location	43.008°N, 109.079°W	--
Depth	5.0 km	± 2.0 km
Number of Phase Applied1	39
Minimum Distance2	47.4 km (0.43°)
Travel Time Residual3	0.76 sec
Azimuthal Gap4	43°

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)