Roundup of Global Volcanic Activity:
Stromboli (Eolian Islands, Italy): Activity has remained more or less unchanged. Explosions, sometimes strong continue from several vents,and small amounts of viscous lava overspills the rims of the NE crater.
Shiveluch (Kamchatka): KVERT reports no significant change in the activity (seismic and surface). Lava flows continue to effuse from the southern fissure. Tremor remains high, although it has continued to slowly decrease. The other active Kamchatkan volcanoes have not shown variations reported: Sheveluch, Bezymianny, Kizimen continue to build their lava domes, Karymsky has occasional small explosions. Seismicity at Gorely volcano remains moderate, caused by internal fluid movements and strong degassing.
Sakurajima (Kyushu, Japan): After 8 days with no reports about explosions, a small eruption last night made it back into the list of Tokyo VAAC reports of ash plumes. The explosion produced an ash plume rising to 6,000 ft (1.8 km) altitude.
Batu Tara (Sunda Islands, Indonesia): Relatively large strombolian explosions at the volcano regularly produce ash plumes rising 5-7,000 ft (1.5-2.1 km) altitude and are visible on satellite data.
Lokon-Empung (North Sulawesi, Indonesia): Another relatively large eruption occurred this morning around 9am local time. The explosion produced an ash plume reported 4 km high (or: altitude?), and strong vibrations felt in up to 5 km distance.h a height of 1580 meters was still in alert status to level III. Authorities advise not to approach the volcano’s summit within 2.5 km radius, which was declared a prohibited zone (villagers often go there to collect wood, grass etc.).
Colima (Western Mexico): After a week of relatively high activity, the volcano has been a bit calmer yesterday and today, although there are still frequent rockfalls and small explosions from the growing lava dome.
Popocatépetl (Central Mexico): Yesterday and during the night, the volcano experienced a phase of continuous emissions and explosions that ejected incandescent tephra onto the upper outer slopes of the volcano and created a plume of steam and some ash rising 500 m above the volcano. This was accompanied by strong tremor as well. At the moment, activity has again calmed down significantly. Glow at the summit shows that the lava dome continues to grow.
Santa María / Santiaguito (Guatemala): Activity has been low recently. Few weak to moderate explosions continue to occur from time to time at the lava dome, with ash plumes reported 5-700 m high and drifting for about 10 km to the west.
Pacaya (Guatemala): INSIVUMEH’s latest bulletin confirms that a small lava lake is present in the Mackenney crater at a depth of 40 meters and generating mostly small strombolian explosions that eject material to the NW flank. These explosions generated weak rumbling sounds. According to INSIVUMEH, activity is likely to pick up in the coming days as the crater is gradually filling up.
Fuego (Guatemala): Activity has remained relatively low. Only few explosions were observed during yesterday, generating fine ash plumes rising up to about 800 m.
Telica (Nicaragua): Seismic activity continues to be strong, but has eased a bit during the past days.
Concepción (Nicaragua): A small swarm of earthquakes and small tremor pulses occurred yesterday.
San Cristobal (Nicaragua): Seismic activity has generally remained low over the past weeks. A phase of more frequent small volcanic earthquakes and some tremor occurred yesterday and has eased again.
Masaya (Nicaragua): The volcano experienced what appears to be a seismic swarm and a phase of increased tremor during the night, but has calmed down again by now.
Machin (Colombia): On April 13 at 15:54 (local time), a volcano-tectonic earthquake of magnitude 2.8 associated with rock fracturing within the volcanic edifice occurred southwest of the main dome a depth of 7.4 km, and was felt by residents near the volcano, in the municipality of Cajamarca, in the village of Toche and the area known as Moral (Tolima).
Nevado del Ruiz (Colombia): A swarm of volcanic earthquakes is continuing under the volcano, and emissions of gas, steam and some ash remain elevated.
Reventador (Ecuador): A MODIS hot spot at the summit and fluctuating moderate levels of seismicity suggest that slow lava extrusion and occasional explosions continue. Tungurahua volcano in turn has remained calm.
Lascar (Northern Chile): The incandescence observed at the crater due to hot gas emissions has decreased during 12-13 April and was no longer visible during last night.