The results of the seismic monitoring of G. Colo showed a significant increase, particularly volcanic earthquakes (VA) and shallow volcanic earthquakes (VB), since June 8, 2015. The number of tremors volcanic earthquakes (VA), on 22 June 2015 is very high, with 12 events, so that previously only 1-5 episodes per day were recorded. The number of shallow volcanic earthquakes (VB) on June 23, 2015, showed a total of 11 events, so that before, there were only 1-8 episodes per day.
The earth quake of this type may indicate a process of fracturing of volcanic rocks in the edifice because of the pressure of the magma to the surface. Other tremors recorded are seismicities distant tectonic earthquakes (TJ) and local tectonic earthquakes (TL).
Visually until now no significant change has never been seen. There is no fumarole in the crater.
From May to June 23, 2015, seismic activity of G. Colo suggests a significant increase, although visually it does not appear to be any significant change. Based on the results of the seismic analysis and visual data with effect from June 24, 2015 at 12:00, the activity level of the G Colo rose from « Normal » (Level I) to « Alert » (level II ).
Colo volcano forms the isolated small island of Una Una in the middle of the Gulf of Tomini in northern Sulawesi. The broad, low volcano contains a 2-km-wide caldera with a small central cone. Only three eruptions have been recorded in historical time, but two of those caused widespread damage over much of the island. The last eruption, in 1983, produced pyroclastic flows that swept over most of the island shortly after all residents had been evacuated.
Colo, ile de Una Una , Indonesie
Source : vsi.esdm. Gvp.