Magnitude 2.9 Earthquake of Greenfield, California 2015-04-19

2015-04-19 17:20:12 (UTC) :North-East of Greenfield, California

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Magnitude : 2.9

Event Time: Time and Date Starting of Earthquake Rupture 

• 2015-04-19 17:20:12 (UTC)

Earthquake data:

Location : Position of Epicenter 

36.468°N 121.038°W

Depth : Depth of starting Rupture 

2.8 km

Region : Greenfield, California

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

a) 24km (15mi) NE of Greenfield, California

b) 26km (16mi) E of Soledad, California

c) 29km (18mi) NNE of King City, California

d) 53km (33mi) SE of Hollister, California

e) 238km (148mi) S of Sacramento, California

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	2.9 md	± 0.1
Location	36.468°N 121.038°W	± 0.1 km
Depth	2.8 km	± 0.5
Number of Phase Applied1	62
Minimum Distance2	5.08 km (0.05°)
Travel Time Residual3	0.09 sec
Azimuthal Gap4	58°

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)