Magnitude 2.5 Earthquake of Fortuna, California 2014-07-18

2014-07-18 06:05:21 UTC :Fortuna, California EARTHQUAKE

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Magnitude: 2.5

Event Time: Time and Date Starting of Earthquake Rupture 

1. 2014-07-18 06:05:21 UTC
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1. 2014-07-17 23:05:21 UTC-07:00 at epicenter

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Earthquake data:

Location : Position of Epicenter 

40.596°N 124.097°W

Depth : Depth of starting Rupture 

17.1km (10.6mi)

Region : Fortuna, 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 Fortuna, California

b)  23km (14mi) SSE of Eureka, California

c)  27km (17mi) S of Bayside, California

d)  30km (19mi) S of Arcata, California

e)  316km (196mi) NW of Sacramento, California

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	2.5 Md	± 0.10
Location	40.596°N, 124.097°W	± 0.5 km
Depth	17.1 km	± 0.7 km
Number of Phase Applied1	17
Minimum Distance2	20.0 km (0.18°)
Travel Time Residual3	0.1 sec
Azimuthal Gap4	158°

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)