Magnitude 4.2 Earthquake of Vandenberg Air Force Base, California USA 2013 August 24

2013-08-24 01:16:31 UTC : Vandenberg Air Force Base, California USA EARTHQUAKE

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Magnitude: 4.2

Event Time: Time and Date Starting of Earthquake Rupture 

2013-08-24 01:16:31 UTC


2013-08-23 17:16:31 UTC-08:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

34.574°N 120.917°W

Depth : Depth of starting Rupture 

13.1km (8.1mi)

Region : Vandenberg Air Force Base, California

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

a) 41km (25mi) WSW of Vandenberg Air Force Base, California

b) 42km (26mi) W of Lompoc, California

c) 54km (34mi) SW of Orcutt, California

d) 60km (37mi) SW of Santa Maria, California

e) 447km (278mi) S of Sacramento, California

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	4.2 Ml	± 0.20
Location	34.574°N, 120.917°W	± 2.3 km
Depth	13.1 km	± 1.7 km
Number of Phase Applied1	24
Minimum Distance2	31.0 km (0.28°)
Travel Time Residual3	0.24 sec
Azimuthal Gap4	230°

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)