Magnitude 3.9 Earthquake of San Jacinto, California 2015-05-06

2015-05-06 07:39:47 (UTC) :North-NorthWest of San Jacinto, California

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Magnitude : 3.9

Event Time: Time and Date Starting of Earthquake Rupture 

• 2015-05-06 07:39:47 (UTC)

Earthquake data:

Location : Position of Epicenter 

33.817°N 116.978°W

Depth : Depth of starting Rupture 

15.3 km

Region : San Jacinto, California

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

a) 4km (2mi) NNW of San Jacinto, California

b) 8km (5mi) N of Hemet, California

c) 11km (7mi) NW of Valle Vista, California

d) 26km (16mi) ESE of Moreno Valley, California

e) 41km (25mi) ESE of Riverside, California

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	3.9 ml	± 0.3
Location	33.817°N 116.978°W	± 0.2 km
Depth	15.3 km	± 0.5
Number of Phase Applied1	118
Minimum Distance2	1.34 km (0.01°)
Travel Time Residual3	0.19 sec
Azimuthal Gap4	21°

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)