MAJOR UPDATE DUE TO IEO REPORT!
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.
Post from before:
Between 11.00 and 12.53 the SIL-station at CHIE showed a very large increase in harmonic tremoring causin the signal to overload and clip. The pattern showed every sign of a full blown eruption happening down there. There have been reports of prolonged steaming from the same spot, and a lot of gas has been spotted coming up. I have also seen pyroclasts surfacing during the day.
This clipping forced a rescale of the plot to be able to follow what is happening. Compare with EGOM station and the rescale is obvious.
During the last two days the temperature above the vent has increased in temperature.
This level of activity has not been since back when the eruption was at its previous peak. There has as the readers of this blog knows been quite a lot of activity at the volcanic vent known as Bob, as well as rapid movements indicating a succession of inflation and deflation periods happening under the Tanganasoga volcano.
The next few days might be very interesting for those who like to follow Bob south of La Restinga.
GeoLurking (Lurking) has during the last days asked for thermal imaging, or satellite thermal images. If anyone knows where to find them, or have access to them, please inform him in a comment in here. We will all benefit from this in the usual plotted manner I am sure.