Magnitude 2.9 Earthquake of Fremont, California USA 2013 September12

2013-09-11 22:50:19 UTC : Fremont, California USA EARTHQUAKE

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Magnitude: 2.9

Event Time: Time and Date Starting of Earthquake Rupture 

1. 2013-09-11 22:50:19 UTC

1. 2013-09-11 15:50:19 UTC-07:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

37.539°N 121.926°W

Depth : Depth of starting Rupture 

10.7km (6.6mi)

Region : Fremont, California

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

a) 5km (3mi) E of Fremont, California

b) 10km (6mi) SE of Union City, California

c) 10km (6mi) E of Newark, California

d) 12km (7mi) N of Milpitas, California

e) 121km (75mi) SSW of Sacramento, California

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	2.9 Md	± 0.20
Location	37.540°N, 121.926°W	± 0.1 km
Depth	10.7 km	± 0.2 km
Number of Phase Applied1	181
Minimum Distance2	2.0 km (0.02°)
Travel Time Residual3	0.19 sec
Azimuthal Gap4	29°

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)