Magnitude 4.8 Earthquake of Yonakuni, Japan 2015-04-06

2015-04-06 11:37:30 (UTC) :West of Yonakuni, Japan

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Magnitude : 4.8

Event Time: Time and Date Starting of Earthquake Rupture 

• 2015-04-06 11:37:30 (UTC)

Earthquake data:

Location : Position of Epicenter 

24.513°N 122.666°E

Depth : Depth of starting Rupture 

83.4 km

Region : Yonakuni, Japan

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

a) 34km (21mi) W of Yonakuni, Japan

b) 83km (52mi) E of Su'ao, Taiwan

c) 96km (60mi) ESE of Yilan, Taiwan

d) 115km (71mi) SE of Keelung, Taiwan

e) 903km (561mi) ENE of Hong Kong, Hong Kong

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	4.8 mb	± 0.1
Location	24.513°N 122.666°E	± 7.4 km
Depth	83.4 km	± 4.8
Number of Phase Applied1	86
Minimum Distance2	35.29 km (0.32°)
Travel Time Residual3	0.78 sec
Azimuthal Gap4	66°

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)