6 hours ago July 8, 2013 Popocatepetl,MEXICO laculturevolcan.blogspot.fr/2013/07/le-point-sur-quelques-er... The last newsletter CENAPRED indicates that during a survey conducted yesterday, volcanologists have noted the presence in the summit crater of a new active dome, about 250 m wide. The detail is important because the dome would be a more effective "plug". Photo taken yesterday the summit crater. Somewhere in the plume, the dome under construction. Image: CENAPRED July 12, 2013 Big explosion this morning at Popocatepetl laculturevolcan.blogspot.fr/2013/07/grosse-explosion-au-popo... Browsing data VAAC Washington, it may be noted that reference is made to an exhalation which occurred around 8:10 GMT or 3:10 hours Mexican. These images are indeed to believe that it is not a mere exhalation, as suggested by the VAAC, but a strong and brief explosion. Two images The first, taken by the Webcam of Tlamacas shows a very important incandescent zone on the eastern slope of stratovolcano at the hour of the event. This glow zone persists over several successive images, unlike most of the benefits of blocks and bombs, the cooling caused the disappearance them glow very quickly. Blocks fell on all sides, but the slope is most affected by the explosion. Image: CENAPRED It persists so that to ask if a lava fell into place, before it fades thereafter. The other image that can give a fair dimension to the event is provided by the webcam installed in San Nicolas de Los Ranchos (opposite side is precisely). It shows, in a very low cloud ceiling, blocks propelled by the explosion. blocks rolled up more than 4 km away from the crater into the wooded area, which stops around 3900 m above sea level on the slope. Rare during this crisis were the times or blocks have reached this distance. Some more or less powerful explosions may occur in the coming days. They are even quite logical in the situation of Popocatepetl. This is a possible mechanism (hypothetically) to explain the explosive activity "untimely": the dome is in place, although initially composed of a relatively fluid lava began to stiffen as a result of its cooling. It is therefore a more effective cap until it was being built. And while there, after 10 days of intense activity, less gas in the column of magma that built the dome, it is more difficult for him to escape because of the "plug". The latter can therefore generate pressures that create these brief explosions and more or less intense. In any case it is because the activity may still be some surprises that the alert level is currently maintained by the yellow-3 CENAPRED. TRaduced by google
Posted on: Sat, 13 Jul 2013 03:55:35 +0000
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