Magnitude 4.4 Earthquake of Old Iliamna, Alaska 2015-04-02

2015-04-02 13:15:05 (UTC) :SE of Old Iliamna, Alaska

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Magnitude : 4.4

Event Time: Time and Date Starting of Earthquake Rupture 

• 2015-04-02 13:15:05 (UTC)

Earthquake data:

Location : Position of Epicenter 

59.414°N 153.892°W

Depth : Depth of starting Rupture 

114.6 km

Region : Old Iliamna, Alaska

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	4.4 ml	--
Location	59.414°N 153.892°W	± 0.3 km
Depth	114.6 km	± 0.4
Number of Phase Applied1	109
Minimum Distance2	--
Travel Time Residual3	0.89 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)