Magnitude 4.3 Earthquake of Rio Dell, California USA 2013 May 18

2013-05-18 13:46:09 UTC : Rio Dell, California USA EARTHQUAKE

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Magnitude: 4.3

Event Time: Time and Date Starting of Earthquake Rupture 

2013-05-18 13:46:09 UTC

2013-05-18 06:46:09 UTC-07:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

40.316°N 124.354°W

Depth : Depth of starting Rupture 

19.4km (12.1mi)

Region : Rio Dell, California

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

a) 29km (18mi) SW of Rio Dell, California

b) 35km (22mi) SSW of Fortuna, California

c) 56km (35mi) SSW of Eureka, California

d) 63km (39mi) SSW of Bayside, California

e) 312km (194mi) NW of Sacramento, California

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	4.3 Mw	--
Location	40.316°N, 124.354°W	± 2.6 km
Depth	19.4 km	± 0.7 km
Number of Phase Applied1	17
Minimum Distance2	6.0 km (0.05°)
Travel Time Residual3	0.2 sec
Azimuthal Gap4	263°

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)