M4.0 – 8km S of Galesburg, Michigan


A Magnitude 4.0 earthquake occurred in southern Michigan at 12:23 EDT this afternoon generating a very clean signal on my seismograph at Millersburg in northeastern Ohio.  The analysis I did using jAmaseis estimated the distance to the epicenter to be 353 km.  The Google Earth ruler measured 348.5 km.  The signal overlaid on the jAmaseis travel time curves is shown below.