Volcanos

Roundup of Global Volcanic Activity:

Shiveluch (Kamchatka): The volcano has been increasingly active during the past days. This morning, an explosive eruption produced an ash plume rising to 21-22,000 ft (6.5-7 km) altitude which drifted ESE. The eruption lasted about 20 minutes, KVERT writes. Glow is visible from the lava dome at night, suggesting that a phase of more vigorous growth is in the process.

Ulawun (New Britain, Papua New Guinea): An SO2 plume visible today indicates that some activity has been taking place at the volcano.

Raung (East Java): A weak SO2 plume (which could be from Ijen and/or Raung volcanoes) is visible on today's satellite data. Recently, mild strombolian activity was observed in the summit crater, which might still be continuing.

Paluweh (off Flores Island, Indonesia): A partial collapse of the lava dome occurred yesterday and produced an explosion and (probably) pyroclastic flows. An ash plume rose to about 3 km (9,000 ft) altitude.

Ambrym (Vanuatu): An elevated SO2 plume from Ambrym shows up regularly on satellite data, suggesting that lava continues to arrive into the vents, maintaining active lava lakes in Benbow and Marum. A series of smaller explosive eruptions seems to have occurred around 26 July, GeoHazards mentioned, based on seismic signals.

White Island (New Zealand): Activity in the main crater has decreased and the Aviation Colour Code has been lowered to Green. GeoNet reports: "The bursts of steam, gas and mud clearly seen last week are no longer visible through the volcano cameras. Volcanic tremor that was high at the end of last week has now decreased to near-background levels.

Veniaminof (Alaska Peninsula, USA): Seismic activity continues to decline, but remains above background levels. Clouds have obscured observations of the volcano in satellite and web camera images for the past week, so it is unclear whether low-level eruptive is continuing. (AVO daily update)

Popocatépetl (Central Mexico): A trend of slowly increasing activity has been apparent over the past days. For the 24 hour interval of 3-4 Aug, CENAPRED recorded 93 emissions, i.e. about 4 per hour, and seismic activity has been stronger recently as well. Interrupting the relatively small emissions of mostly steam and gas, the volcano produces some more significant explosions of stronger size sporadically, with ash plumes typically 1-2 km height.

Santa María / Santiaguito (Guatemala): No changes in activity need to be reported. The lava dome continues to produce occasionally small explosions and feeds at least one weakly active block lava flow on the southern slope of the dome. Insivumeh warns of possible lahars that the current heavy rains could trigger.

Pacaya (Guatemala): After the short surge of activity last week, the volcano has been very calm. INSIVUMEH reports no explosions, but this is probably partly due to cloud cover preventing observations.

Fuego (Guatemala): The level of activity has remained low, characterized by weak strombolian activity and a small lava flow on the upper southern flank.

Telica (Nicaragua): Seismic activity with frequent volcanic-tectonic quakes remains above background. A series of small earthquakes with magnitudes up to about 2 has been occurring recently directly under the volcano.