Magnitude 4.1 Earthquake of Ferndale, California 2014-10-04

2014-04 06:38:45 UTC :Ferndale, California EARTHQUAKE

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Magnitude : 4.1

Event Time: Time and Date Starting of Earthquake Rupture 

1. 2014-09-07 15:45:34 UTC
2. 
   

1. 2014-10-03 22:38:45 UTC-08:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

40.637°N 125.473°W

Depth : Depth of starting Rupture 

3.2km (2.0mi)

Region : Ferndale, California

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

a) 102km (63mi) W of Ferndale, California

b) 111km (69mi) W of Fortuna, California

c) 112km (70mi) W of Eureka, California

d) 120km (75mi) WSW of Arcata, California

e) 410km (255mi) NW of Sacramento, California

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	4.1 mw	--
Location	40.637°N, 125.473°W	± 2.6 km
Depth	3.2 km	± 29.7 km
Number of Phase Applied1	103
Minimum Distance2	98.0 km (0.88°)
Travel Time Residual3	0.35 sec
Azimuthal Gap4	259°

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)