Magnitude 4.6 Earthquake of Chichi-shima, Japan 2014-09-15

2014-09-15 01:48:38 UTC :Chichi-shima, Japan EARTHQUAKE

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Magnitude : 4.6

Event Time: Time and Date Starting of Earthquake Rupture 

1. 2014-09-15 01:48:38 UTC
2. 
   

1. 2014-09-15 10:48:38 UTC+09:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

27.873°N 140.890°E

Depth : Depth of starting Rupture 

67.7km (42.0mi)

Region : Chichi-shima, Japan

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

a) 157km (98mi) NW of Chichi-shima, Japan

b) 775km (482mi) SSE of Shimoda, Japan

c) 788km (490mi) SSE of Oyama, Japan

d) 794km (493mi) S of Tateyama, Japan

e) 874km (543mi) S of Tokyo, Japan

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	4.6 mb	± 0.09
Location	27.873°N, 140.890°E	--
Depth	67.7 km	± 8.7 km
Number of Phase Applied1	29
Minimum Distance2	154.3 km (1.39°)
Travel Time Residual3	0.93 sec
Azimuthal Gap4	72°

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)