Wednesday, October 5, 2011

Ongoing noteworthy eruptions - October

Nabro Volcano - Eritrea

This from the Smithsonian Global Volcanism Program:

"According to NASA's Earth Observatory, satellite images of Nabro acquired on 28 September showed heat from the vent in the central crater, and from an area 1.3 km S of the vent that indicated an active lava flow. A small and diffuse plume rose from the vent. A region of seemingly thicker black ash (that completely covered the sparse vegetation) was noted S of the crater and thinner layers of ash (with some areas of visible vegetation) flanked either side of the region." - GVP

Nabro volcano is a prominent stratovolcano in Eritrea, which has not previously erupted in historical time until recently when it had a massive explosion, and lava effusion which resulted in a kilometers long lava flow. Nabro had been previously thought to have ended its eruptive phase, but this now turns out not to be true. Could we be seeing more from this long-dormant volcano in the near future? Satellite images shown on Irish Weather Online seem to suggest the old volcano isn't quite done waking up just yet.

El Hierro Volcano - Canary Islands

The El Hierro unrest is ongoing. This volcano has not erupted since 1793. Over 1,100 volcanic tremors have been detected within the last few days, the largest quake being a 3.8. Ground deformation has continued up to 35mm. Local officials have placed residents on alert, and asked them to stockpile emergency supplies. At this point, the activity seems to be off of the coast, but this can change rapidly if magma races to the surface.

Katla Volcano - Iceland

Amateur volcanologist Jón Frímann has been using his own seismic equipment in conjunction with Icelandic Meteorological websites to report on the volcanoes of Iceland. Recently there has been some speculation on his part about whether an eruption is imminent, as there have been swarms of quakes within Katla's caldera. I personally do not believe an eruption is imminent at this time, as Katla has had minor burps since the eruption of Eyjafjallajökull last year. This volcano IS expected to be the next eruption in Iceland, however they took their eye off of Grimsvötn volcano, and it erupted before Katla. It could indeed be that dike intrusion and ice melt are occurring however. Time will tell here.

Cleveland Volcano (Chuginadak Island) - Alaska

NASA detected thermal anomalies over the growing lava dome, The Alaska Volcano Observatory (AVO) reported. A slowly growing lava dome (there is an awesome time laspe picture on their page right now) increases the risk of an explosive eruption, but does not necessarily mean one will happen. This has been going on for over a month now.

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