IEO has released a report on the bathymetric measurments. It is based on the measurments from 11th and 12th of January. So it does not take into account the last weeks heightened activity.

The current depth of the volcano is 130 meters. The cone is now mended with new material and has a lower incline of the slope, and should as such be more stable. This new stabillity should give Bob a good chance at growing if the eruption continues.

A lot of the ejected material has gone down slope, both from the earlier flank collaps, but also with a lot of new material. It has now filled up the canyon leading away from Bob. This should also increase the growth rate.

The total volume ejected via the volcanic flank eruption vent called Bob is now above the 0,145 cubic kilometre mark. Considering the amount of tephra suspended in the water, high volume of floating pumice stone (pyroclasts) we could now consider Bob to be rated at a VEI-3 on the explosivity scale. But remember that this has been achieved over more than a hundred days of activity. As a direct comparison we can compare with Eyjafjallajökulls eruption that lasted about 90 days and ejected a total lava volume of 1.4 ± 0.1 x 107 m3, comparing tephra volume is hard, but should be about the same really although the tephra here is suspended in the water. But judging from stain size it is a probable guess that we can assume roughly that Bob has ejected 1.4 x 108 m3 of tephra.

Our little Bob is actually not that small. Just very slow and steady in his build up.
[link to volcanocafe.wordpress.com]