Magnitude 4.7 Earthquake of Otsuchi, Japan 2014-08-04

2014-08-04 05:58:21 UTC :Otsuchi, Japan EARTHQUAKE

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Magnitude: 4.7

Event Time: Time and Date Starting of Earthquake Rupture 

1. 2014-08-04 05:58:21 UTC
2. 
   

1. 2014-08-04 14:58:21 UTC+09:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

39.306°N 142.207°E

Depth : Depth of starting Rupture 

35.0km (21.7mi)

Region : Otsuchi, Japan

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

a) 27km (17mi) ESE of Otsuchi, Japan

b) 28km (17mi) E of Kamaishi, Japan

c) 28km (17mi) SE of Yamada, Japan

d) 42km (26mi) SSE of Miyako, Japan

e) 458km (285mi) NNE of Tokyo, Japan

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	4.7 mb	± 0.17
Location	39.306°N, 142.207°E	--
Depth	35.0 km	± 2.0 km
Number of Phase Applied1	17
Minimum Distance2	311.8 km (2.80°)
Travel Time Residual3	1.51 sec
Azimuthal Gap4	213°

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)