Last night at 02:36 UTC (23.01.2012) there was an earthquake with the magnitude of ML4.7 in Hawaii Island. This earthquake was felt according to what I have been reading about on the forum. This earthquake activity is most likely due to changes in tectonic stresses in the area. Rather then anything volcanic.
The largest aftershock following this earthquake did get the size ML3.1 Earthquake activity is currently ongoing. But I do not know to what extent exactly. Sharp aftershocks should be expected in this area in the next few hours to days.