Magnitude 4.2 Earthquake of Chitina, Alaska USA 2013 July 15

2013-07-15 13:16:56 UTC : Chitina, Alaska USA EARTHQUAKE

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Magnitude: 4.2

Event Time: Time and Date Starting of Earthquake Rupture 

1. 2013-07-15 13:16:56 UTC

1. 2013-07-15 05:16:56 UTC-08:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

61.566°N 141.089°W

Depth : Depth of starting Rupture 

1.0km (0.6mi)

Region : Chitina, Alaska

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

a) 178km (111mi) E of Chitina, Alaska

b) 338km (210mi) WNW of Whitehorse, Canada

c) 452km (281mi) E of Knik-Fairview, Alaska

d) 472km (293mi) E of Anchorage, Alaska

e) 484km (301mi) SE of Badger, Alaska

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	4.2 Ml	--
Location	61.566°N, 141.089°W	± 0.2 km
Depth	1.0 km	± 0.0 km
Number of Phase Applied1	82
Minimum Distance2	--
Travel Time Residual3	0.87 sec
Azimuthal Gap4	40°

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)