Volcano Discovery Saturday Mar 23, 2013 17:19 PM |
Webcam image of the crater area of Stromboli with dust from rockfalls on the Sciara (INGV)
Satellite image of the active flow fields of Tolbachik (NASA satellite image data, processed by volcanodetect)
Stromboli (Eolian Islands, Italy): An increase in activity has occurred today. Lava overspills wide area of the rims of the NE crater, causing lava overflows and numerous rockfalls descending down the Sciara del Fuoco.
Tremor and explosion signals have increased in strength.
El Hierro (Canary Islands, Spain): The scenario of an eruption in the near future is becoming increasingly likely:
- Volcanic tremor continues, suggesting magma is still moving although mostly laterally for the time being to an area just north off the western tip of the island.
Tolbachik (Kamchatka): Activity continues essentially unchanged: strombolian explosions accompany the effusion of fluid lava flows from the southern fissure of Tolbachinsky Dol. The flows spread into 2 distinct fields to the west and the east and are well visible on satellite data.
KVERT reports that the tremor amplitude remains oscillating between medium to high levels, at about 1/3 of their level during the start of the eruption.
Batu Tara (Sunda Islands, Indonesia): For several days in a row, ash plumes have been spotted at 10,000 ft (3 km) altitude. The volcano, in near-continuous strombolian activity since 2006, has apparently stepped up the frequency of larger explosions although perhaps part of this might be explained by better meteorologic conditions allowing to detect ash plumes.
Colima (Western Mexico): Small explosions from the growing dome, associated rockfalls and volcanic earthquakes have continued to increase in amplitude and frequency during the past days and weeks.
Popocatépetl (Central Mexico): No big changes in activity have occurred. Emissions of gas-steam-sometimes small amounts of ash have remained less than 1 per hour on average (yesterday).
The today's seismogram shows tiny volcano-tectonic earthquakes and what seems to be a phase of slightly elevated tremor. A hot spot is visible on recent MODIS satellite imagery, corresponding to the growing lava dome, which continues to produce visible glow at night as well.
Telica (Nicaragua): The seismic swarm continues with no changes. Hundreds of tiny quakes up to magnitudes around 2 have been occurring for the past days, but no reports have become available (so far).
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