In terms of predicting timing of volcanic eruptions (and resulting tsunamis) I agree that there is no way to satisfactorily model their occurrence. Broadly speaking, however, there seems to be a connection between volcanic activity and sunspot activity, and since we are entering a grand solar minimum, we should anticipate increased volcanic activity:

http://adsbit.harvard.edu//full/2003ESASP.535..393S/0000393.000.html