Sunday, April 12, 2015

Magnitude 4.6 Earthquake of Annaka, Japan 2015-04-12

2015-04-12 06:25:15 (UTC) :NorthWest of Annaka, Japan

earthquake monitor,Japan earthquake, earthquake realtime

Magnitude : 4.6

Event Time: Time and Date Starting of Earthquake Rupture 
  • 2015-04-12 06:25:15 (UTC)
Earthquake data:

Location : Position of Epicenter 

36.411°N 138.819°E

Depth : Depth of starting Rupture 

147.3 km

Region : Annaka, Japan
Magnitude 4.6 Earthquake of Annaka, Japan 2015-04-12

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

a) 12km (7mi) NW of Annaka, Japan

b) 16km (10mi) W of Kaneko, Japan

c) 18km (11mi) WSW of Shibukawa, Japan

d) 19km (12mi) NNW of Tomioka, Japan

e) 112km (70mi) NW of Tokyo, Japan

Location Uncertainty: 
4.6 mb
± 0.1
36.411°N 138.819°E
± 5.6 km
147.3 km
± 5.1
Number of Phase Applied1

Minimum Distance2
57.11 km (0.51°)

Travel Time Residual3
0.79 sec

Azimuthal Gap4

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)

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