Magnitude 4.9 Earthquake of Iwaki, Japan 2013 June 04

2013-06-01 15:06:01 UTC : Iwaki, Japan EARTHQUAKE

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Magnitude: 4.9

Event Time: Time and Date Starting of Earthquake Rupture 

1. 2013-06-04 08:33:20 UTC

1. 2013-06-04 17:33:20 UTC+09:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

37.199°N 141.352°E

Depth : Depth of starting Rupture 

36.5km (22.7mi)

Region : Iwaki, Japan

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

a) 44km ENE of Iwaki, Japan

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	4.9 mb	± 0.05
Location	37.199°N, 141.352°E	± 18.2 km
Depth	36.6 km	± 9.6 km
Number of Phase Applied1	54
Minimum Distance2	290.5 km (2.61°)
Travel Time Residual3	0.70 sec
Azimuthal Gap4	125°

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)