Magnitude 3.1 Earthquake of Cobb, California USA 2013 May 15

2013-05-15 06:11:55 UTC : Cobb, California USA EARTHQUAKE

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Magnitude: 3.1

Event Time: Time and Date Starting of Earthquake Rupture 

2013-05-15 06:11:55 UTC

2013-05-14 23:11:55 UTC-07:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

38.819°N 122.802°W

Depth : Depth of starting Rupture 

3.7km (2.3mi)

Region : Cobb, California

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

a) 6km (4mi) W of Cobb, California

b) 21km (13mi) SW of Clearlake, California

c) 23km (14mi) NNE of Healdsburg, California

d) 30km (19mi) N of Windsor, California

e) 116km (72mi) WNW of Sacramento, California

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	3.1 Ml	± 0.20
Location	38.819°N, 122.803°W	± 0.2 km
Depth	3.7 km	± 0.2 km
Number of Phase Applied1	62
Minimum Distance2	1.0 km (0.01°)
Travel Time Residual3	0.06 sec
Azimuthal Gap4	43°

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)