Volcano Discovery Sunday Mar 17, 2013 12:04 PM
Thermal webcam image of the crater area of Stromboli (INGV)
Thermal webcam image at 04:51 showing an ash plume from Etna's Voragine
Stromboli (Eolian Islands, Italy): No lasting new larger lava flows have occurred over the past days, but it is obvious that the craters, in particular the NE vents, are literally "filled to the rim", and often produce small overflows from the crater. A strong tremor signal accompanies this process.
Strombolian explosions in turn occur as well, but are comparably weak (in contrast to the elevated phase of activity in early Jan).
Etna (Sicily, Italy): A pronounced tremor spike showed up this morning, leading perhaps to the suspicion of a follow-up paroxysm (as Etna has sometimes done in the past). However, looking at webcam images from that time, it seems that an explosion and/or a collapse event (more likely) occurred from Voragine crater and produced a marked tremor spike. An ash plume and minor amounts of hot material can be seen rising a few 100 meters at around 04:51 local time.
...16 Mar:
Typical for Etna's paroxysms, activity has ended quickly after reaching an impressive climax with lava fountains around and perhaps even above 1 km in height.
Telica (Nicaragua): An earthquake swarm has occurred last night at the volcano.
San Cristobal (Nicaragua): Banded volcanic tremor and some higher magnitude volcanic earthquakes have returned to show up on the seismic records.
Masaya (Nicaragua): A phase of increased tremor occurred yesterday. Today, it has eased again to normal levels.
Nevado del Ruiz (Colombia): Seismic activity has been generally low. INGEOMINAS published some photos showing strong degassing from the volcano.
The seismic recordings show small clusters of higher amplitude volcano-tectonic and volcanic earthquakes as well as continuous low-level tremor during the recent days.
Reventador (Ecuador): A thermal anomaly at the summit and continuing explosion earthquakes mixed with low-level volcanic tremor suggest that lava extrusion at the summit crater has resumed (or rather continues more vigorously) these days.
Tungurahua (Ecuador): The volcano alternates between strong activity with ash emissions and explosions and pauses. The corresponding seismic signal shows this with phases of frequent earthquakes and explosion signals merging into strong eruption tremor followed by rather quiet periods.
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