Magnitude 3.5 Earthquake of East Foothills, California USA 2013 May 10

2013-05-10 05:12:24 UTC : East Foothills, California USA EARTHQUAKE

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Magnitude: 3.5

Event Time: Time and Date Starting of Earthquake Rupture 

2013-05-10 05:12:24 UTC

2013-05-09 22:12:24 UTC-07:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

37.367°N 121.733°W

Depth : Depth of starting Rupture 

6.6km (4.1mi)

Region : East Foothills, California

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

a) 7km (4mi) ESE of East Foothills, California

b) 8km (5mi) E of Alum Rock, California

c) 14km (9mi) ENE of San Jose, California

d) 16km (10mi) ESE of Milpitas, California

e) 136km (85mi) S of Sacramento, California

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	3.5 Mw	--
Location	37.367°N, 121.733°W	± 0.1 km
Depth	6.6 km	± 0.3 km
Number of Phase Applied1	88
Minimum Distance2	3.0 km (0.03°)
Travel Time Residual3	0.07 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 1800 (both depth and location)