Volcanos

Roundup of Global Volcanic Activity:

Stromboli (Eolian Islands, Italy): After decreasing a bit yesterday, the overflow of lava from the NE vents has gained in strength this morning again, accompanied by constant rockfalls, relatively strong explosions and higher tremor.

Tolbachik (Kamchatka): KVER reports no change in the ongoing eruption of the volcano and ongoing high tremor values at levels similar to the past weeks. Recent field reports however suggest that the eruption continues its slowly declining trend and might actually be ending soon. A group who visited the volcano on 29 April could not see lava flows or explosions at the active cone on the southern fissure. It was even possible to walk on the now cooling lava flows. However, weak incandescence and a MODIS hot spot remain visible. It is likely that the still elevated tremor signal indicates that the magma continues to be fed into lava tubes and emerges in places that are difficult to see or access. Although it would not come at all as a surprise if the eruption ends, after almost half a year, it is certainly still too early to announce its end right now.

Telica (Nicaragua): Seismic activity has declined and is now again near normal levels (which include frequent earthquakes typical for Telica volcano's behavior).

Poas (Costa Rica): A small earthquake swarm occurred yesterday, probably caused by fluid movements bringing heat into the crater lake. Seismicity has calmed down today again.

Nevado del Ruiz (Colombia): A shallow (5 km depth) earthquake of magnitude 3.8 occurred yesterday at 10:24 local time north of the Arenas crater and has been followed by an ongoing earthquake swarm. The quake was felt in nearby areas including Manizales and Villamaria. Possibly, this could mean a new magmatic intrusion, but so far no reports of increased surface activity have become known.

Reventador (Ecuador): Activity remains moderate with frequent small explosions detected on seismic signals and strong degassing producing a plume that was observed yesterday rising 800 m.

Tungurahua (Ecuador): Ash emissions and explosions of moderate size have continued and generated a plume averaging 1-2 km in height above the crater. During the night, incandescence is visible at the summit. Some of the stronger explosions are accompanied by cannon-shot noises.