Monday, April 20, 2015

Magnitude 3.7 Earthquake of Medford, Oklahoma 2015-04-20

2015-04-20 12:08:31 (UTC) :West of Medford, Oklahoma

earthquake monitor, Oklahoma earthquake, earthquake realtime

Magnitude : 3.7

Event Time: Time and Date Starting of Earthquake Rupture 
  • 2015-04-20 12:08:31 (UTC)
Earthquake data:

Location : Position of Epicenter 

36.822°N 97.861°W

Depth : Depth of starting Rupture 

2.4 km

Region : Medford, Oklahoma
Magnitude 3.7 Earthquake of Medford, Oklahoma 2015-04-20

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

a) 11km (7mi) W of Medford, Oklahoma

b) 47km (29mi) N of Enid, Oklahoma

c) 70km (43mi) W of Ponca City, Oklahoma

d) 77km (48mi) WSW of Arkansas City, Kansas

e) 153km (95mi) NNW of Oklahoma City, Oklahoma

Location Uncertainty: 
3.7 mb_lg
± 0.1
36.822°N 97.861°W
± 1.5 km
2.4 km
± 7.8
Number of Phase Applied1

Minimum Distance2
3.23 km (0.03°)

Travel Time Residual3
0.65 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)

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