There was a third earthquake this morning, a magnitude 2.2 event possibly under Lake Mead. The USGS lists it as occurring in Nevada but their most detailed map shows it just over the border in Arizona. [right, location map from USGS]
Earlier today, we had magnitude 2.4 and 2.o events nearby.
update 7-27-11 4pm: all 3 quakes are now gone from the USGS earthquake page and list.We assume they decided they were not tectonic, ie, they are due to the lake filling??, and so deleted them.