Magnitude 2.6 Earthquake of Willows, California USA 2013 May 15

2013-05-15 22:15:50 UTC : Willows, California USA EARTHQUAKE

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Magnitude: 2.6

Event Time: Time and Date Starting of Earthquake Rupture 

2013-05-15 22:15:50 UTC

2013-05-15 15:15:50 UTC-07:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

39.508°N 121.988°W

Depth : Depth of starting Rupture 

22.6km (14.0mi)

Region : Willows, California

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

a) 17km (11mi) E of Willows, California

b) 27km (17mi) SSW of Chico, California

c) 37km (23mi) W of Oroville, California

d) 42km (26mi) SW of Paradise, California

e) 111km (69mi) NNW of Sacramento, California

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	2.6 Md	± 0.20
Location	39.508°N, 121.988°W	± 0.4 km
Depth	22.6 km	± 0.8 km
Number of Phase Applied1	54
Minimum Distance2	29.0 km (0.26°)
Travel Time Residual3	0.29 sec
Azimuthal Gap4	32°

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)