Magnitude 4.5 Earthquake of Little Sitkin Island, Alaska USA 2013 May 14

2013-05-14 07:20:26 UTC : Little Sitkin Island, Alaska USA EARTHQUAKE

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Magnitude: 4.5

Event Time: Time and Date Starting of Earthquake Rupture 

2013-05-14 07:20:26 UTC

2013-05-14 19:20:26 UTC+12:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

50.891°N 178.862°E

Depth : Depth of starting Rupture 

35.0km (21.7mi)

Region : Little Sitkin Island, Alaska

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

a) 120km (75mi) SSE of Little Sitkin Island, Alaska

b) 1404km (872mi) E of Petropavlovsk-Kamchatskiy, Russia

c) 1421km (883mi) E of Vilyuchinsk, Russia

d) 1423km (884mi) E of Yelizovo, Russia

e) 3014km (1873mi) W of Whitehorse, Canada

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	4.5 mb	± 0.06
Location	50.891°N, 178.862°E	± 25.3 km
Depth	35.0 km	± 3.0 km
Number of Phase Applied1	54
Minimum Distance2	298.3 km (2.68°)
Travel Time Residual3	1.04 sec
Azimuthal Gap4	140°

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)