University of Wisconsin Milwaukee Department of Geosciences
6/28/04 Illinois 4.2 Mw Earthquake
6/28/04 Illinois Focal Mechanism
6/28/04 Illinois Earthquake Focal Mechanism


Earthquake Details

Seismogram Explanation

Location: Illinois

P-wave arrival time: 06:11:25 (UTC); 1:11:25 am (local)

Date: June 28, 2004

S-wave arrival time: Not Verified.

Time: 06:10:54 (UTC); 1:10:54 am (local)

The vertical axis is in units of displacement in centimeters.

Latitude: 41.39 N

The horizontal axis is in units of time in seconds.

Longitude: 89.05 W

The beginning of the file is the origin of the event.

Magnitude: 4.2 Mw

Depth: 12 km

Distance: 1.9 deg (131 miles from Milwaukee)


Link to Indiana University PEPP webpage with more records of this quake (including UWM's)

Updated as of by Brett Ketter

Seismograms created using Seismic Analysis Code (SAC; Lawrence Livermore National Laboratory)
Focal mecanisms created using Generic Mapping Tools (GMT; Wessel and Smith; University of Hawaii, Manoa)

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