20130721 09:52:58 UTC : Takahagi, Japan EARTHQUAKE
earthquake monitor,Japan earthquake, earthquake realtime
Magnitude: 4.9
Event Time: Time and Date Starting of Earthquake Rupture
 20130721 09:52:58 UTC
 20130721 18:52:58 UTC+09:00 at epicenter
Earthquake data:
Location : Position of Epicenter
36.345°N 141.688°E
36.345°N 141.688°E
Depth : Depth of starting Rupture
19.4km (12.1mi)
Region : Takahagi, Japan
Directions and Distances :Directions and Distances from Geographical Reference in Close Proximity Which can be effected by Location Uncertainty
19.4km (12.1mi)
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
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 Applied^{1}

44


Minimum Distance^{2}

313.9 km (2.82°)


Travel Time Residual^{3}

1.00 sec


Azimuthal Gap^{4}

118°

^{1}Number 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.
^{2}Minimum Distance:
Horizontal distance of nearest Station measured in Km from epicenter. The smaller the more accuracy in prediction of depth of EQ.
^{3}Travel 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.
^{4}Azimuthal 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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