Sunday, July 21, 2013

Magnitude 4.9 Earthquake of Takahagi, Japan 2013 July 21

2013-07-21 09:52:58 UTC : Takahagi, Japan EARTHQUAKE

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Magnitude: 4.9


Event Time: Time and Date Starting of Earthquake Rupture 

  1. 2013-07-21 09:52:58 UTC

  1. 2013-07-21 18:52:58 UTC+09:00 at epicenter


Earthquake data:

Location : Position of Epicenter 

36.345°N 141.688°E

Depth : Depth of starting Rupture 

19.4km (12.1mi)

Region : Takahagi, Japan
takahagi, japan earthquake 2013 July 21

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

a) 96km (60mi) ESE of Takahagi, Japan

b) 97km (60mi) ESE of Hitachi, Japan

c) 97km (60mi) ESE of Kitaibaraki, Japan

d) 
97km (60mi) E of Oarai, Japan


e) 194km (121mi) ENE of Tokyo, Japan

Location Uncertainty: 
Parameter
Value
Uncertainty
Magnitude
4.9 mb
± 0.06
Location
36.345°N, 141.688°E
± 19.1 km
Depth
19.4 km
± 7.0 km
Number of Phase Applied1
44

Minimum Distance2
313.9 km (2.82°)

Travel Time Residual3
1.00 sec

Azimuthal Gap4
118°

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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