20150530 00:41:14 (UTC) : North of Fairfield, Illinois
earthquake monitor, Illinois earthquake, earthquake realtime
Magnitude : 3.4
Event Time: Time and Date Starting of Earthquake Rupture
 20150530 00:41:14 (UTC)
Earthquake data:
Location : Position of Epicenter
38.458°N 88.355°W
Depth : Depth of starting Rupture
17.7 km
a) 8km (5mi) N of Fairfield, Illinois
b) 50km (31mi) ENE of Mount Vernon, Illinois
c) 68km (42mi) E of Centralia, Illinois
d) 75km (47mi) SSE of Effingham, Illinois
e) 186km (116mi) SE of Springfield, Illinois
Location Uncertainty:
Parameter

Value

Uncertainty

Magnitude^{}

3.4 mlg



Location^{}

38.458°N 88.355°W

± 0.6 km

Depth

17.7 km

± 0.9

Number of Phase Applied^{1}

27
 
Minimum Distance^{2}

9.08 km (0.08°)
 
Travel Time Residual^{3}

0.4 sec
 
Azimuthal Gap^{4}

52°

^{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)
No comments:
Post a Comment