Magnitude 3.4 Earthquakeof Fairfield, Illinois 2015-05-30

2015-05-30 00:41:14 (UTC) : North of Fairfield, Illinois

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Magnitude : 3.4

Event Time: Time and Date Starting of Earthquake Rupture 

• 2015-05-30 00:41:14 (UTC)

Earthquake data:

Location : Position of Epicenter 

38.458°N 88.355°W

Depth : Depth of starting Rupture 

17.7 km

Region : Fairfield, Illinois

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

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 Applied1	27
Minimum Distance2	9.08 km (0.08°)
Travel Time Residual3	0.4 sec
Azimuthal Gap4	52°

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)

Magnitude 2.7 Earthquake of ILLINOIS, USA 2013 March 11

2013 March 11 05:56:02 UTC: ILLINOIS, USA EARTHQUAKE

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Magnitude: 2.7

Date-Time: Monday, March 11, 2013 at 05:56:02 UTC

Monday, March 11, 2013 at 12:56:02 AM at epicenter

Earthquake data:

Location : 38.038°N, 88.730°W

Depth : 5 km (3.1 miles)

Region : ILLINOIS

Distances:

a) 17 km (10 miles) ENE of Benton, Illinois

b) 34 km (21 miles) SSE of Mount Vernon, Illinois

c) 37 km (22 miles) NE of Herrin, Illinois

d) 38 km (23 miles) NNE of Marion, Illinois

Location Uncertainty: horizontal +/- 7.5 km (4.7 miles); depth +/- 3.1 km (1.9 miles)

Parameters: NST= 55, Nph= 61, Dmin=57.9 km, Rmss=0.89 sec, Gp= 40°, M-type="Nuttli" surface wave magnitude (mbLg), Version=3