Volcano Discovery Tuesday Apr 23, 2013 13:03 PM
Thermal webcam image of the crater area of Stromboli (INGV)
Depth vs time of the recent earthquakes west of Miyake island
Stromboli (Eolian Islands, Italy): The small lava flow issuing from the breached NE crater continues, but has not progressed much. Frequent glowing rockfalls descend the Sciara del Fuoco.
Miyake-shima (Izu Islands): The earthquake swarm that started on 17 April and included a magnitude 5.6 quake has been decreasing and remained at the same depths at around 10-15 km just west off the island.
This suggests that no magmatic intrusions have formed at shallower depths (so far) and the scenario of a (submarine) eruption is less likely.
Batu Tara (Sunda Islands, Indonesia): A stronger strombolian explosion produced an ash plume rising to 5,000 ft / 1.5 km this morning, which drifted 15 nautical miles to the NW (VAAC Darwin).
Popocatépetl (Central Mexico): Activity continues with no significant changes: weak emissions of steam/gas/ash occur at rates of approx. once per hour, and glow at night shows that magma continues to arrive slowly in the summit crater.
Telica (Nicaragua): Numerous small volcanic earthquakes continue at high frequency at the volcano, accompanied by continuous tremor.
San Cristobal (Nicaragua): Numerous small volcanic earthquakes have merged into weak continuous volcanic tremor.
Masaya (Nicaragua): Seismic activity has generally remained low and near normal levels at the volcano over the past weeks.
Nevado del Ruiz (Colombia): The frequency and size of earthquakes has diminished, but is still above normal levels, and suggests that the intrusion of fresh magma is not yet over. A volcanic-tectonic earthquake of magnitude 2.9 occurred this morning at a depth of 7.24 km NW of the Arenas crater.
The other Colombian volcanoes have not shown significant variations in activity: Weak seismic unrest continues at Machin, Cumbal and Sotara volcanoes with no surface activity. Nevado del Huila has remained in a degassing state with average low seismicity during the past weeks, while Galeras volcano produces occasional steam and ash emissions.
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