Magnitude 3.9 Earthquake of Medford, Oklahoma 2014-07-14

2014-07-14 07:15:51 UTC : Medford, Oklahoma EARTHQUAKE

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Magnitude: 3.9

Event Time: Time and Date Starting of Earthquake Rupture 

1. 2014-07-14 07:15:51 UTC

1. 2014-07-14 02:15:51 UTC-05:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

36.700°N 97.856°W

Depth : Depth of starting Rupture 

7.7km (4.8mi)
Region : Medford, Oklahoma

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

a)  16km (10mi) SW of Medford, Oklahoma

b)  33km (21mi) N of Enid, Oklahoma

c)  68km (42mi) W of Ponca City, Oklahoma

d)  83km (52mi) WSW of Arkansas City, Kansas

e)   140km (87mi) NNW of Oklahoma City, Oklahoma

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	3.9 mb	± 0.10
Location	36.700°N, 97.856°W	--
Depth	7.7 km	± 5.4 km
Number of Phase Applied1	128
Minimum Distance2	24.5 km (0.22°)
Travel Time Residual3	0.78 sec
Azimuthal Gap4	23°

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)