Magnitude 5.2 Earthquake of Chichi-shima, Japan 2014-09-21

2014-09-21 17:32:04 UTC :Chichi-shima, Japan EARTHQUAKE

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Magnitude : 5.2

Event Time: Time and Date Starting of Earthquake Rupture 

1. 2014-09-21 17:32:04 UTC
2. 
   

1. 2014-09-22 02:32:04 UTC+09:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

27.925°N 139.648°E

Depth : Depth of starting Rupture 

491.1km (305.2mi)

Region : Chichi-shima, Japan

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

a) 270km (168mi) WNW of Chichi-shima, Japan

b) 733km (455mi) SSE of Shingu, Japan

c) 750km (466mi) S of Shimoda, Japan

d) 752km (467mi) S of Oyama, Japan

e) 861km (535mi) S of Tokyo, Japan

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	5.2 mb	± 0.03
Location	27.925°N, 139.648°E	--
Depth	491.1 km	± 6.4 km
Number of Phase Applied1	133
Minimum Distance2	267.1 km (2.40°)
Travel Time Residual3	0.68 sec
Azimuthal Gap4	27°

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)