Magnitude 3.1 Earthquake of Medford, Oklahoma 2015-04-12

2015-04-12 12:10:35 (UTC) :SouthWest of Medford, Oklahoma

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Magnitude : 3.1

Event Time: Time and Date Starting of Earthquake Rupture 

• 2015-04-12 12:10:35 (UTC)

Earthquake data:

Location : Position of Epicenter 

36.701°N 97.915°W

Depth : Depth of starting Rupture 

2.8 km

Region : Medford, Oklahoma

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

a) 20km (12mi) SW of Medford, Oklahoma

b) 34km (21mi) N of Enid, Oklahoma

c) 74km (46mi) W of Ponca City, Oklahoma

d) 87km (54mi) WSW of Arkansas City, Kansas

e) 141km (88mi) NNW of Oklahoma City, Oklahoma

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	3.1 mb_lg	± 0.1
Location	36.701°N 97.915°W	± 1.6 km
Depth	2.8 km	± 7.6
Number of Phase Applied1	75
Minimum Distance2	17.37 km (0.16°)
Travel Time Residual3	0.30 sec
Azimuthal Gap4	43°

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)