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Volcanic activity world-wide 28 June 2012: Eruption warning for El Hierro, updates for Colombia and Mexico

Thu, 28 Jun 2012, 16:55
16:55 PM | BY: T
Live data viewed with our webcams.volcanodiscovery.com tool
Live data viewed with our webcams.volcanodiscovery.com tool
The intense seismic swarm at El Hierro volcano continues with more than 100 quakes > M1.5 so far today. The quakes are concentrated underneath the El Julan coast, and some of the most recent quakes today have been at significantly shallower levels, 15-17 km, and indicate that magma now has started to rise.
PEVOLCA in a press release admits that significant inflation has been observed since the onset of the seismic swarm, confirming that the cause of it is new magma. Although it is not certain at all that it will, an eruption should be expected to occur any time now. The most likely area is probably the El Julan coast or further south in the Las Calmas Sea.
We have updated our interactive webcam viewer to include some of the publicly available seismic and deformation data: webcams.volcanodiscovery.com/ElHierro

Galeras (Colombia): Although seismic activity has descreased, tremor and small earthquakes continue to occur. Some of the seismic signals (such as the one early on 28 June) look like screw-shaped tornillos, which in the past have often preceded eruptions.
Nevado del Ruiz (Colombia): tremor at relatively low levels, related to gas and steam and sometimes ash venting

Popocatépetl (Mexico): Small volcano-tectonic earthquakes, spasmodic and harmonic tremor, along with small gas and ash emissions, and occasional explosions continue. A large SO2 plume is produced by the volcano as well.
Previous news
Wed, 27 Jun 2012, 09:11
Location and depth map of the quakes beneath El Hierro during the past 36 hours. The red bullets ion the Las Calmas sea only started in the June 26 afternoon.
The most interesting volcano-related event at the moment is certainly the seismic crisis on El Hierro where the high-intensity earthquake swarm accompanied by tremor episodes continues. The quakes, still at "safe" 20 km depth, have now migrated to the El Julan coast where magma could be accumulating. ... read all
Tue, 26 Jun 2012, 06:27
A new eruption might be under way at El Hierro (Canary Islands, Spain). Following several weaker swarms in the past weeks, a strong swarm started late on 24 June and increased dramatically to more than 200 earthquakes of M1.5 or more, including volcanic tremor. The quakes locations indicated that magma was moving at depth from N towards the S in a similar way as at the start of the 2011 submarine eruption. Therefore, the possibility of renewed eruptive activity is real. ... read all

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