Magnitude 3.1 Earthquake of Langston, Oklahoma 2015-04-10

2015-04-10 10:07:32 (UTC) :South-SouthEast of Langston, Oklahoma

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Magnitude : 3.1

Event Time: Time and Date Starting of Earthquake Rupture 

• 2015-04-10 10:07:32 (UTC)

Earthquake data:

Location : Position of Epicenter 

35.850°N 97.230°W

Depth : Depth of starting Rupture 

60.4 km

Region : Langston, Oklahoma

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

a) 10km (6mi) SSE of Langston, Oklahoma

b) 17km (11mi) E of Guthrie, Oklahoma

c) 31km (19mi) NE of Edmond, Oklahoma

d) 33km (21mi) SSW of Stillwater, Oklahoma

e) 49km (30mi) NNE of Oklahoma City, Oklahoma

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	3.1 mb_lg	± 0.1
Location	35.850°N 97.230°W	± 1.8 km
Depth	6.4 km	± 7.6
Number of Phase Applied1	43
Minimum Distance2	21.15 km (0.19°)
Travel Time Residual3	0.76 sec
Azimuthal Gap4	37°

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)