ALEXANDRIA, Min. (MNN) - Some western Minnesotans may or may not have felt it, but there was a small earthquake early Friday morning.  The U.S. Geological Survey reports it measured just two-point-five on the Richter Scale and was centered near Alexandria, near Lake Mina, along one of Minnesota's most active fault lines.  The tremor happened just after 2 a.m.  No damage or injuries were reported.