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Turrialba Volcano emits gas and steam
Two large steam and gas emissions were spotted Tuesday morning atop the Turrialba Volcano in the province of Cartago, east of San José, authorities from the National Seismological Network (RSN) at the University of Costa Rica said.
Turrialba residents said the two gas columns measure nearly 1 km in height and are moving towards the north face of the volcano.
“These gases are mostly water vapor, 90 percent, and the rest are volcanic gases,” Raúl Mora Amador, the RSN’s lead volcanologist explained. One of the gas trails comes from the main crater, and the other rises from the east wall of the volcano, he added.
Anak Krakatau volcano (Indonesia): growing lava dome
An active lava dome is growing inside the summit crater of Krakatau volcano. Our tour expedition leader Andi just returned from a visit and reports that the dome is now about 100 m wide, and has 2 main active vents that eject jets of incandescent gas.
At night, the glow from the dome is clearly visible from Rakata and Sertung islands, and a continuous intense solfatara plume is rising about 500 m above the summit.
Andi and our group observed also that there are now more and larger fumarole fields on the southern part of the cone.
According to our observations and the opinion of local scientists, this area is inflated due to the pushing of the lava dome. The seismic recordings from the observatory of Krakatau also show an increase in activity. On 26 March, there were 138 volcanic-tectonic (A-type) earthquakes and 300 long-period (B-type) quakes alone. The question is how long the lava dome remains quiet and purely effusive in style. Explosive, also larger vulcanian-type ones, activity could occur any time.
Alert level raised for remote Alaska volcano
ANCHORAGE, Alaska (AP) — The alert level for a remote Alaska volcano has been raised again after scientists found another lava dome has formed in the crater in the last week.
The Alaska Volcano Observatory on Wednesday increased the level for Cleveland Volcano, a 5,675-foot peak on uninhabited Chuginadak Island about 940 miles southwest of Anchorage. The status was raised earlier this year when the center detected two small, likely ash-poor eruptions through March 13, but lowered the alert level last week after 10 days of inactivity.
Scientists can't actively monitor the volcano because there is no real-time seismic monitoring network on the volcano in the Aleutian Islands. Authorities say sudden eruptions could occur at any time, and ash clouds 20,000 feet above sea level are possible.