Magnitude 3.1 Earthquake of Perry, Oklahoma 2014-07-31

2014-07-31 06:09:30 UTC : Perry, Oklahoma EARTHQUAKE

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Magnitude: 3.1

Event Time: Time and Date Starting of Earthquake Rupture 

1. 2014-07-31 06:09:30 UTC

1. 2014-07-31 01:09:30 UTC-05:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

36.300°N 97.545°W

Depth : Depth of starting Rupture 

4.1km (2.6mi)

Region : Perry, Oklahoma

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

a)  23km (14mi) W of Perry, Oklahoma

b)  31km (19mi) ESE of Enid, Oklahoma

c)  47km (29mi) NNW of Guthrie, Oklahoma

d   48km (30mi) WNW of Stillwater, Oklahoma

e)  92km (57mi) N of Oklahoma City, Oklahoma

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	3.1 mb_lg	± 0.05
Location	36.300°N, 97.545°W	--
Depth	4.1 km	± 7.4 km
Number of Phase Applied1	40
Minimum Distance2	23.0 km (0.21°)
Travel Time Residual3	0.36 sec
Azimuthal Gap4	36°

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)