The default is Notice, and that really is enough any lower and the amount of trivial entries will go up. So the entries are normal for your logging level, as is indicated by a) the info icon and b) the Information title in the windows event viewer event entries in your image. If you looked in the avast log viewer, Info section you would see the same entries.
Unfortunately, the image example you gave 'virus detection' would be classed as a Warning and recorded with the default Notice level.