Ibu volcano news
Ibu volcano (Halmahera, Indonesia) activity update & field observations: mild to moderate explosive activity at lava dome
vendredi nov. 14, 2014 03:03 | AUTEUR : T
Strombolian eruption from a vent in the center of Ibu's lava dome
When observed during 12-13 Nov, there was frequent mild to moderate explosive activity from at two different vents in the center of the lava dome.
The cinder cone in the center of Ibu's lava dome
No activity was observed at the lava dome itself. The vent to the south is surrounded by a recent-looking cinder cone, about 30 m tall and 60 m wide, and produced likely phreatomagmatic explosions at intervals of 20-30 mintues. These typically seemed to start from a cluster of vents inside the cone's crater, ejecting dense white steam as well as gray ash plumes, sometimes followed by dense black tephra jets reaching 10-20 m in height. Sometimes, the ash plumes collapsed to form small pyroclastic flows running down the western slope of the cone. At night, weak incandescence could be seen and only few glowing blombs were ejected during these eruptions.
The sencond vent to the north of the cinder cone had typical strombolian explosions which ejected many incandescent lava bombs to 100-200 m height and produced billowing ash plumes rising up to 500 m.
A possibly third vent in the same area of the second one often had phases of intense degassing that lasted several minutes with increasing strength. Accompanied by loud jet-engine like sounds, a dense steam plume was erupted, followed by dilute ash at the end of the degassing event.
The most recent lava flow was if at all very weakly active. No incandescence or movement was visible, only a few rockfalls at the probably last active front at the break-in-slope between the crater breach and the deep gully that cuts the crater on the northern side. It apparently had originated from the second vent area and spilled into northern ravine, like a number of previous lava flows.
jeudi, oct. 16, 2014
A viscous lava flow continues to be active on the northern flank of the volcano. The flow, similar to the one currently active at Santiaguito volcano in Guatemala, starts as an overflow from the lava dome in the crater, and forms a lobe traveling through a breach of the crater rim into a ravine extending north of the volcano. ... lire toutes
lundi, juil. 28, 2014
Ibu volcano (Halmahera, Indonesia) activity update: thermal anomalies suggest resumed lava dome growth
New thermal signals have been detected recently coming from the northern rim of the volcano's summit crater, suggesting that the volcano has entered a phase of increased activity. lire toutes
dimanche, mars 30, 2014
Activity (effusive / explosive) continues at the volcano, which has an active lava dome. A new MODIS hot spot is visible on satellite data, suggesting this has recently increased. ... lire toutes
mardi, févr. 25, 2014
A thermal anomaly remains visible at the volcano on satellite data, suggesting that there is some sort of ongoing eruptive activity. This could likely be from a slowly growing lava dome. ... lire toutes
mercredi, oct. 23, 2013
Hot spots at the summit have become larger and more frequently observed on recent MODIS satellite data. This indicates that activity has become more intense at the volcano with its active lava dome. ... lire toutes