Magnitude 4.8 Earthquake of Iwaki, Japan 2014-08-17

2014-08-17 18:15:55 UTC :Iwaki, Japan EARTHQUAKE

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Magnitude: 4.8

Event Time: Time and Date Starting of Earthquake Rupture 

1. 2014-08-17 18:15:55 UTC
2. 
   

1. 2014-08-18 03:15:55 UTC+09:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

36.827°N 142.423°E

Depth : Depth of starting Rupture 

24.1km (15.0mi)

Region : Iwaki, Japan 

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

a) 139km (86mi) E of Iwaki, Japan

b) 145km (90mi) ESE of Namie, Japan

c) 149km (93mi) E of Kitaibaraki, Japan

d) 152km (94mi) E of Takahagi, Japan

e) 276km (171mi) ENE of Tokyo, Japan

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	4.8 mb	± 0.08
Location	36.827°N, 142.423°E	--
Depth	24.1 km	± 5.4 km
Number of Phase Applied1	74
Minimum Distance2	378.4 km (3.40°)
Travel Time Residual3	0.98 sec
Azimuthal Gap4	81°

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)