Magnitude 4.8 Earthquake of Yonakuni, Japan 2015-05-28

2015-05-28 07:57:43 (UTC) : South-West of Yonakuni, Japan

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Magnitude : 4.8

Event Time: Time and Date Starting of Earthquake Rupture 

• 2015-05-28 07:57:43 (UTC)

Earthquake data:

Location : Position of Epicenter 

23.974°N 122.450°E

Depth : Depth of starting Rupture 

30.3 km

Region : Yonakuni, Japan

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

a) 78km (48mi) SW of Yonakuni, Japan

b) 86km (53mi) E of Hualian, Taiwan

c) 92km (57mi) SE of Su'ao, Taiwan

d) 111km (69mi) SE of Yilan, Taiwan

e) 869km (540mi) ENE of Hong Kong, Hong Kong

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	4.8 mb	± 0.1
Location	23.974°N 122.450°E	± 4.2 km
Depth	30.3 km	± 5.3
Number of Phase Applied1	78
Minimum Distance2	78.93 km (0.71°)
Travel Time Residual3	0.83 sec
Azimuthal Gap4	104°

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)