I was busy yesterday and had missed the earthquake activity in Oklahoma. The Magnitude 5.6 event early this morning (UTC) shown in the bottom of the display, was large enough to trigger a notification to me from the USGS but the others were below the threshold that I had set. When I looked this morning I had also picked up the Mag 4.7 at 7:12:45 UTC shown toward the top of the display. The display shows the relative difference in the size of the waveform for two earthquakes at the same distance but with a 0.9 difference in magnitude. The larger earthquake released 22.4 times as much energy as the smaller one and should be about 7.9 times bigger on the seismograph.
Murmurs from the Earth... 