Magnitude 4.1 Earthquake of Perry, Oklahoma 2015-04-29

2015-04-29 16:42:26 (UTC) :West of Perry, Oklahoma

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Magnitude : 4.1

Event Time: Time and Date Starting of Earthquake Rupture 

• 2015-04-29 16:42:26 (UTC)

Earthquake data:

Location : Position of Epicenter 

36.289°N 97.527°W

Depth : Depth of starting Rupture 

2.2 km

Region : West of Perry, Oklahoma

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

a) 21km (13mi) W of Perry, Oklahoma

b) 33km (21mi) ESE of Enid, Oklahoma

c) 46km (29mi) WNW of Stillwater, Oklahoma

d) 46km (29mi) NNW of Guthrie, Oklahoma

e) 91km (57mi) N of Oklahoma City, Oklahoma

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	4.1 mb_lg	± 0.0
Location	36.289°N 97.527°W	± 1.1 km
Depth	2.2 km	± 7.9
Number of Phase Applied1	38
Minimum Distance2	47.42 km (0.43°)
Travel Time Residual3	0.22 sec
Azimuthal Gap4	61°

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)