Magnitude 2.8 Earthquake of Gilroy, California USA 2013 May 30

2013-05-30 06:32:48 UTC : Gilroy, California USA EARTHQUAKE

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Magnitude: 2.8

Event Time: Time and Date Starting of Earthquake Rupture 

2013-05-30 06:32:48 UTC

2013-05-29 23:32:48 UTC-07:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

36.992°N 121.459°W

Depth : Depth of starting Rupture 

9.6km (6.0mi)

Region : Gilroy, California

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

a) 9km (6mi) E of Gilroy, California

b) 16km (10mi) NNW of Hollister, California

c) 23km (14mi) SE of Morgan Hill, California

d) 28km (17mi) ENE of Watsonville, California

e) 176km (109mi) S of Sacramento, California

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	2.8 Md	± 0.10
Location	36.993°N, 121.459°W	± 0.2 km
Depth	9.6 km	± 0.4 km
Number of Phase Applied1	77
Minimum Distance2	5.0 km (0.04°)
Travel Time Residual3	0.1 sec
Azimuthal Gap4	47°

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)