Magnitude 3.1 Earthquake of Valdez, Alaska 2014-07-21

2014-07-21 10:44:58 UTC  : Valdez, Alaska EARTHQUAKE

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Magnitude: 3.1

Event Time: Time and Date Starting of Earthquake Rupture 

1. 2014-07-21 10:44:58 UTC

1. 2014-07-21 02:44:58 UTC-08:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

61.313°N 147.002°W

Depth : Depth of starting Rupture 

9.5km (5.9mi)

Region : Valdez, Alaska

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

a)  40km (25mi) WNW of Valdez, Alaska

b)    140km (87mi) E of Knik-Fairview, Alaska

c)  155km (96mi) E of Anchorage, Alaska

d)  389km (242mi) S of Badger, Alaska

1. 
   

 e) 648km (403mi) W of Whitehorse, Canada

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	3.1 ml	--
Location	61.313°N, 147.002°W	± 0.2 km
Depth	9.5 km	± 0.3 km
Number of Phase Applied1	67
Minimum Distance2	--
Travel Time Residual3	0.74 sec
Azimuthal Gap4	--

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)