The following constitutes the new activity and unrest report from the
Weekly Volcanic Activity Report, a cooperative project between the Smithsonian's
Global Volcanism Program and the US Geological Survey's
Volcano Hazards Program.
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| Cleveland volcano. |
CLEVELAND Chuginadak Island 52.825°N, 169.944°W; summit elev. 1730 m
AVO reported that satellite observations of Cleveland during 22-28 February revealed that the growth of the
lava dome continued at a slow rate. Cloud cover over the volcano prevented views of the
lava dome during 22 and 25-28 February. On 23 February a thermal anomaly was detected in partly cloudy satellite images. The
Volcano Alert Level remained at Watch and the
Aviation Color Code remained at Orange. No current seismic information was available because Cleveland does not have a real-time seismic network.
Map
KANAGA Andreanof Islands 51.923°N, 177.168°W; summit elev. 1307 m
AVO
reported that no unusual activity was detected in seismic data or in
partly-cloudy satellite images of Kanaga during 22-24 and 26-28
February. Low-level volcanic tremor was detected on 25 February. The
Volcano Alert Level remained at Advisory and the
Aviation Color Code remained at Yellow.
Map
RINCON DE LA VIEJA Costa Rica 10.830°N, 85.324°W; summit elev. 1916 m
OVSICORI-UNA
reported that seismic data revealed two eruptions on 19 and 20 February
from Rincón de la Vieja's active crater. Two more eruptions also
occurred on 23 February. Explosions were heard in Guachipelin (11 km SW)
between 0400 and 0430.
Map
TUNGURAHUA Ecuador 1.467°S, 78.442°W; summit elev. 5023 m
IG reported moderate activity at Tungurahua during 22-28 February. Steam plumes with some
ash content rose to altitudes of 1-2 km (3,300-6,500 ft)
a.s.l.
and drifted W during 22-24 February. Ash fall was reported in Palitahua
(6 km SSW), Choglontus (13 km WSW), and Manzano (8 km SW) on 23
February, and in the Mapayacu (SW) and Achupashal (NW) gorges on 24
February.
Strombolian
activity was observed on 24 February, and incandescence material that
rose as high as 500 m above the crater fell on the W and NW flanks.
Ashfall was reported to the SW in Manzano again on 25 February. A
steam-and-ash plume rose as high as 800 m above the crater and drifted W
on 26 February. Crater incandescence was observed on 23 and 27
February.
Map
For ongoing volcanic activity and additional geological summary, click
HERE.