Volcanos

Roundup of Global Volcanic Activity:

Lokon-Empung (North Sulawesi, Indonesia): Following the moderately large explosion yesterday, small ash emissions continue from the crater, as seen on this webcam image today.

Ambrym (Vanuatu): A large SO2 plume is seen on NOAA satellite data today, indicating that fresh lava continues to arrive inside the lava lakes of the caldera vents.

White Island (New Zealand): New Zealand scientist undertook a gas measurements flight and found values of CO2 and SO2 emissions at similar levels as in December. Observations during the flight revealed that the mud geysering in the main crater lake is still vigorous Tremor and seismic activity also remain high and eruptions could occur with no or little warning.

Agrigan (Mariana Islands, USA): In a satellite image from January 22, NOAA's Washington Volcanic Ash Advisory Center spotted a possible volcanic plume from Agrigan volcano, located on the next volcanic island north of Pagan (Mariana Isl). Neither USGS nor NOAA have received confirmation of a volcanic source for this anomaly and it is likely the cloud was weather-related.

San Cristobal (Nicaragua): Volcanic earthquakes and low-level volcanic tremor continue at fluctuating levels within the volcano.

San Miguel (El Salvador): Volcanic tremor and earthquake numbers increased slightly yesterday, but dropped again today.

Reventador (Ecuador): IG reported lava flows descending from the summit area and continuous emissions creating a 2 km tall plume yesterday (24 Jan). Several hot spots are visible on MODIS images. Today, the seismic signal alternates between periods of strong tremor with quieter phases, suggesting that activity has been occurring in pulses.

Copahue (Chile/Argentina border): Intense internal (seismic) unrest continues. Sernageomin reported 25 volcano-tectonic and 106 long period events as well as episodes of tremor during 19 hours between 22-23 Jan. An explosion signal was recorded at 23:55 local time (22 Jan) that corresponded to a brief increase of the height of the gas plume to 1500 m above the crater. No ash emissions or incandescence, or other signs of surface activity other than a moderate slow increase in degassing have so far been observed.