Magnitude 4.6 Earthquake of Yongchang, China 2014-08-09

2014-08-09 06:53:44 UTC :Yongchang, China EARTHQUAKE

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Magnitude: 4.6

Event Time: Time and Date Starting of Earthquake Rupture 

1. 2014-08-09 06:53:44 UTC

1. 2014-08-09 14:53:44 UTC+08:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

31.825°N 104.227°E

Depth : Depth of starting Rupture 

44.1km (27.4mi)

Region : Yongchang, China

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

a)  26km (16mi) NW of Yongchang, China

b)  46km (29mi) W of Jiangyou, China

c)  64km (40mi) NW of Mianyang, China

d)  78km (48mi) N of Deyang, China

e)  1207km (750mi) N of Ha Noi, Vietnam

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	4.6 mb	± 0.09
Location	31.825°N, 104.227°E	--
Depth	44.1 km	± 5.7 km
Number of Phase Applied1	66
Minimum Distance2	1164.5 km (10.46°)
Travel Time Residual3	0.61 sec
Azimuthal Gap4	81°

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)