Look at the depths of the quakes - they are all very shallow. Were they representing magma movement they would be far deeper and generating distinguishing harmonic signatures. It is unlikely they are relating to the activation of a volcano.
Harmonic tremor usually occurs during an eruption. Hasn’t happened yet. Check out the depth trend for the last 10 days. To my mind this is magma working to the surface, probabaly along an existing fault:
Date Average Depth (KM)
4/18/2011 3.87
4/17/2011 4.24
4/16/2011 4.86
4/15/2011 6.44
4/14/2011 10.17
4/13/2011 11.96
4/12/2011 12.57
4/11/2011 10.26