Magnitude 4.3 Earthquake of Guthrie, Oklahoma 2015-04-08

2015-04-08 20:51:59 (UTC) :South of Guthrie, Oklahoma

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Magnitude : 4.3

Event Time: Time and Date Starting of Earthquake Rupture 

• 2015-04-08 20:51:59 (UTC)

Earthquake data:

Location : Position of Epicenter 

35.851°N 97.425°W

Depth : Depth of starting Rupture 

5.0 km

Region : Guthrie, Oklahoma

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

a) 3km (2mi) S of Guthrie, Oklahoma

b) 22km (14mi) NNE of Edmond, Oklahoma

c) 40km (25mi) NNE of Warr Acres, Oklahoma

d) 41km (25mi) NNE of Bethany, Oklahoma

e) 43km (27mi) N of Oklahoma City, Oklahoma

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	4.3 mb_lg	± 0.0
Location	35.851°N 97.425°W	± 4.8 km
Depth	5.0 km	± 2.0
Number of Phase Applied1	113
Minimum Distance2	6.57 km (0.06°)
Travel Time Residual3	0.86 sec
Azimuthal Gap4	24°

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)