Magnitude 4.8 Earthquake of Ongjin, North Korea 2013 May 17

2013-05-17 22:02:26 UTC : Ongjin, North Korea Earthquake

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Magnitude: 4.8

Event Time: Time and Date Starting of Earthquake Rupture 

2013-05-17 22:02:26 UTC

2013-05-18 06:02:26 UTC+08:00 at epicenter

Earthquake data:

Location : Position of Epicenter 

37.633°N 124.580°E

Depth : Depth of starting Rupture 

13.5km (8.4mi)

Region : Ongjin, North Korea

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

a) 76km (47mi) WSW of Ongjin, North Korea

b) 82km (51mi) SSW of Changyon, North Korea

c) 97km (60mi) WSW of Pyoksong-up, North Korea

d) 109km (68mi) WSW of Haeju, North Korea

e) 186km (116mi) SSW of Pyongyang, North Korea

Location Uncertainty: 

Parameter	Value	Uncertainty
Magnitude	4.8 mb	± 0.08
Location	37.633°N, 124.580°E	± 18.0 km
Depth	13.5 km	± 6.3 km
Number of Phase Applied1	67
Minimum Distance2	291.7 km (2.62°)
Travel Time Residual3	1.07 sec
Azimuthal Gap4	60°

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)