Magnitude 2.8 Earthquake of Helena, Oklahoma 2014-09-17

2014-09-17 21:01:16 UTC :Helena, Oklahoma EARTHQUAKE

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Magnitude : 2.8

Event Time: Time and Date Starting of Earthquake Rupture 

1. 2014-09-17 21:01:16 UTC

1. 2014-09-17 16:01:16 UTC-05:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

36.483°N 98.512°W

Depth : Depth of starting Rupture 

4.6km (2.9mi)

Region : Helena, Oklahoma

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

a)  22km (14mi) WSW of Helena, Oklahoma

b)  57km (35mi) W of Enid, Oklahoma

c)  78km (48mi) E of Woodward, Oklahoma

d)  107km (66mi) N of Weatherford, Oklahoma

e)  144km (89mi) NW of Oklahoma City, Oklahoma

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	2.8 ml	--
Location	36.483°N, 98.512°W	--
Depth	4.6 km	± 7.4 km
Number of Phase Applied1	0
Minimum Distance2	--
Travel Time Residual3	0.75 sec
Azimuthal Gap4	100°

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)