Volcanos

Roundup of Global Volcanic Activity:

Cleveland (Aleutian Islands, Alaska): After finding evidence of a new lava dome growing in the summit crater, AVO raised the alert level of Cleveland back to orange. The decision was based on satellite obtained on 30 Jan that indicate that a lava dome has grown in the summit crater. As of January 30 the dome was about 100 m in diameter and may have begun forming as early as January 24 when elevated surface temperatures were observed in satellite images. The size and shape of the dome appears to be unchanged through February 2 according to the most recently available satellite data. AVO has received no reports of activity or ash emissions since elevated surface temperatures were first observed around the 24th of January.

Campi Flegrei (Phlegrean Fields) (Italy): (6 Feb) A new fumarole vent has been detected recently in the Campi Flegrei in the hydrothermal field of Pisciarelli. The new vent was seen ejecting hot gas as well as geyser-like fountains of water reaching 4-5 meters of height. This will inevitably trigger headlines in the press about the possibility of a volcanic eruption in the area. Not much new activity has occurred in the world of volcanoes today.

Rabaul (Tavurvur) (New Britain, Papua New Guinea): Small to medium-sized ash eruptions from Tavurvur continue. VAAC Darwin detected ash plumes this morning rising to 8,000 ft (2.5 km) altitude and maintains aviation alert code orange.

Paluweh (off Flores Island, Indonesia): (6 Feb) It seems that activity has decreased since the large explosion on Sunday. It also appears likely that it had been triggered by a partial dome collapse followed by an explosion and more dome collapse events could follow.

Dukono (Halmahera): (6 Feb) Increased activity has generated a SO2 plume visible on today's NOAA satellite data.

Colima (Western Mexico): (6 Feb) Small explosion and rockfall signals have become more frequent over the past days.

Popocatépetl (Central Mexico): Gas emissions (SO2) remain high, while the rate of emissions has decreased again to less than 1 per hour.

Activity of the Guatemalan volcanoes Fuego and Santiaguito has been becoming increasingly explosive in favor of effusive. Both have mild strombolian explosions and weakly alimented lava flows.

San Cristobal (Nicaragua): Surface activity and tremor remain low, but there has been an increase in small volcanic quakes.

In Colombia, Machin continues to show seismic activity above background, mainly in the form of frequent tiny volcanic earthquakes. Nevado del Ruiz produces a steam and gas plume sometimes mixed with some ash. Seismic activity has been low.

Kamchatka: Lava flow emission remains unchanged at the ongoing eruption of Tolbachik volcano. Moderate seismicity accompanies the lava dome building at Sheveluch and Kizimen. Seismicity remained low at Karymski and Klyuchevskoi volcano, although small explosions probably continue at both volcanoes. The strong seismicity from Tolbachik still makes it impossible to read the signals from Bezymianny, which also has been active and building a lava dome for years. Gorely has medium levels of tremor that relate to fluid movements and strong degassing.