Magnitude 2.8 Earthquake of Stillwater, Oklahoma 2014-08-20

2014-08-20 22:54:00 UTC :Stillwater, Oklahoma EARTHQUAKE

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Magnitude: 2.8

Event Time: Time and Date Starting of Earthquake Rupture 

1. 2014-08-20 22:54:00 UTC

1. 2014-08-20 17:54:00 UTC-05:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

36.253°N 97.082°W

Depth : Depth of starting Rupture 

5.0km (3.1mi)

Region : Stillwater, Oklahoma

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

a)  15km (9mi) N of Stillwater, Oklahoma

b) 50km (31mi) S of Ponca City, Oklahoma

c)  51km (32mi) NE of Guthrie, Oklahoma

d)  73km (45mi) ESE of Enid, Oklahoma

e)  95km (59mi) NNE of Oklahoma City, Oklahoma

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	2.8 mb_lg	± 0.06
Location	36.253°N, 97.083°W	--
Depth	5.0 km	± 2.0 km
Number of Phase Applied1	31
Minimum Distance2	34.8 km (0.31°)
Travel Time Residual3	0.42 sec
Azimuthal Gap4	66°

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)