Magnitude 4.9 Earthquake of Hachijo-jima, Japan 2013 August 17

2013-08-17 23:01:03 UTC : Hachijo-jima, Japan EARTHQUAKE

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Magnitude: 4.9

Event Time: Time and Date Starting of Earthquake Rupture 

1. 2013-08-17 23:01:03 UTC

1. 2013-08-18 08:01:03 UTC+09:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

33.336°N 139.430°E 

Depth : Depth of starting Rupture 

34.8km (21.6mi)

Region : Hachijo-jima, Japan

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

a) 44km (27mi) NW of Hachijo-jima, Japan

b) 154km (96mi) SSE of Shimoda, Japan

c) 179km (111mi) SE of Oyama, Japan

d) 183km (114mi) S of Ito, Japan

e) 262km (163mi) S of Tokyo, Japan

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	4.9 mb	± 0.05
Location	33.336°N, 139.430°E	± 13.1 km
Depth	34.8 km	± 4.1 km
Number of Phase Applied1	150
Minimum Distance2	315.0 km (2.83°)
Travel Time Residual3	0.71 sec
Azimuthal Gap4	30°

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)