Magnitude 4.0 Earthquake of Miyako, Japan 2014-08-21

2014-08-21 15:20:47 UTC :Miyako, Japan EARTHQUAKE

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Magnitude: 4.0

Event Time: Time and Date Starting of Earthquake Rupture 

1. 2014-08-21 15:20:47 UTC
2. 
   

1. 2014-08-22 01:20:47 UTC+10:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

39.549°N 143.652°E

Depth : Depth of starting Rupture 

30.7km (19.1mi)

Region : Miyako, Japan

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

a) 146km (91mi) E of Miyako, Japan

b) 146km (91mi) E of Yamada, Japan

c) 152km (94mi) E of Otsuchi, Japan

d) 155km (96mi) ENE of Kamaishi, Japan

e) 552km (343mi) NE of Tokyo, Japan

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	4.0 mb	± 0.21
Location	39.549°N, 143.652°E	--
Depth	30.7 km	± 6.5 km
Number of Phase Applied1	21
Minimum Distance2	277.3 km (2.49°)
Travel Time Residual3	0.73 sec
Azimuthal Gap4	150°

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)