Friday, April 24, 2015

Magnitude 4.6 Earthquake of Iwaki, Japan 2015-04-24

2015-04-24 07:37:52 (UTC) :East-SouthEast of Iwaki, Japan

earthquake monitor, Japan earthquake, earthquake realtime

Magnitude : 4.6

Event Time: Time and Date Starting of Earthquake Rupture 
  • 2015-04-24 07:37:52 (UTC)
Earthquake data:

Location : Position of Epicenter 

36.459°N 142.852°E

Depth : Depth of starting Rupture 

34.9 km

Region : Iwaki, Japan
Magnitude 4.6 Earthquake of Iwaki, Japan 2015-04-24

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

a) 187km (116mi) ESE of Iwaki, Japan

b) 191km (119mi) E of Kitaibaraki, Japan

c) 193km (120mi) E of Takahagi, Japan

d) 197km (122mi) E of Hitachi, Japan

e) 297km (185mi) ENE of Tokyo, Japan

Location Uncertainty: 
4.6 mb
± 0.1
36.459°N 142.852°E
± 8.0 km
34.9 km
± 7.7
Number of Phase Applied1

Minimum Distance2
240.56 km (2.16°)

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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