Magnitude 2.5 Earthquake of Willow, Alaska USA 2013 May 16

2013-05-16 21:48:30 UTC : Willow, Alaska USA EARTHQUAKE

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Magnitude: 2.5

Event Time: Time and Date Starting of Earthquake Rupture 

2013-05-16 21:48:30 UTC

2013-05-16 13:48:30 UTC-08:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

61.780°N 150.364°W

Depth : Depth of starting Rupture 

8.5km (5.3mi)

Region : Willow, Alaska

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

a) 17km (11mi) WNW of Willow, Alaska

b) 50km (31mi) NW of Knik-Fairview, Alaska

c) 67km (42mi) NNW of Anchorage, Alaska

d) 365km (227mi) SSW of Fairbanks, Alaska

e) 828km (514mi) WNW of Whitehorse, Canada

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	2.5 Ml	--
Location	61.780°N, 150.364°W	± 0.4 km
Depth	8.5 km	± 0.4 km
Number of Phase Applied1	30
Minimum Distance2	62.0 km (0.56°)
Travel Time Residual3	1.1 sec
Azimuthal Gap4	50°

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)