Magnitude 2.5 Earthquake of Redoubt Volcano, Alaska 2014-09-17

2014-09-17 20:40:19 UTC  : Redoubt Volcano, Alaska EARTHQUAKE

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Magnitude : 2.5

Event Time: Time and Date Starting of Earthquake Rupture 

1. 2014-09-17 20:40:19 UTC

1. 2014-09-17 12:40:19 UTC-08:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

1. 60.115°N 152.713°W

Depth : Depth of starting Rupture 

104.2km (64.7mi)

Region : Redoubt Volcano, Alaska

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

a)  41km (25mi) S of Redoubt Volcano, Alaska

b)    196km (122mi) SW of Anchorage, Alaska

c)  230km (143mi) SW of Knik-Fairview, Alaska

1. 
   

d)  585km (364mi) SSW of Fairbanks, Alaska

1. e)  972km (604mi) W of Whitehorse, Canada

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	2.5 ml	--
Location	60.115°N, 152.713°W	± 0.9 km
Depth	104.2 km	± 0.9 km
Number of Phase Applied1	20
Minimum Distance2	--
Travel Time Residual3	0.64 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)