The red line on this chart shows the total energy released each day (in Joules) and the equivalent magnitude if the day's energy had all been released in one earthquake. The equivalent magnitude may not be much higher than the strongest individual quake on that day, as it takes many smaller quakes to release as much energy as one larger one.
The orange line shows the total number of quakes each day. Move your mouse over the graph to see the number of quakes (along with individual energy / equivalent magnitude values).
Today's reading will likely be low, especially early in the day; it will climb as quakes occur (and are subsequently reported). Previous days' readings should mostly be final, and change very little.