Magnitude 4.2 Earthquake of Little Sitkin Island, Alaska 2014-08-09

2014-08-09 02:59:54 UTC  : Little Sitkin Island, Alaska EARTHQUAKE

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Magnitude: 4.2

Event Time: Time and Date Starting of Earthquake Rupture 

1. 2014-08-09 02:59:54 UTC

1. 2014-08-08 17:59:54 UTC-09:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

1. 51.874°N 178.435°E

Depth : Depth of starting Rupture 

121.6km (75.6mi)

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)    9km (6mi) SSW of Little Sitkin Island, Alaska

 b)    1346km (836mi) E of Petropavlovsk-Kamchatskiy, Russia

 c)  1363km (847mi) E of Vilyuchinsk, Russia

 d)  1364km (848mi) E of Yelizovo, Russia

1.  e)  2970km (1845mi) W of Whitehorse, Canada

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	4.2 mb	± 0.09
Location	51.874°N, 178.435°E	--
Depth	121.6 km	± 10.7 km
Number of Phase Applied1	36
Minimum Distance2	81.6 km (0.73°)
Travel Time Residual3	1.36 sec
Azimuthal Gap4	151°

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)