December 07, 2015. EN. Etna , Momotombo , Asosan.
December 07, 2015.
Etna, Sicily :
Small pyroclastic flows on the Etna volcano. The activity of the volcano is still high, but there has been a significant change: while explosions and high amplitude tremor continues in the craters of Voragine, it seems that for a few hours, most of the magma migrated to another party, especially to the new pit crater that has been formed, the other day on the upper side of the new South East crater (NCSE).
Here, yesterday around 8:00 am local (depending on time of the webcam) began an intense strombolian activity with emission of dense ash plumes and a small explosion that resulted in a small pyroclastic flow which is down towards the Valley del Bove.
After the four paroxysmal eruptive episodes at the Voragine crater of Etna in the past few days, the focus of eruptive activity has shifted, in the early hours of 6 December 2015, to the New Southeast Crater (NSEC), activating the pit crater that had formed around 25 November on the upper east flank of the NSEC cone .
During the evening hours of 5 December, eruptive activity at the Voragine had progressively diminished; but between 02:00 and 03:00 UTC (=local time -1), the surveillance cameras of the INGV-OE showed the onset of vigorous Strombolian activity from the vent on the east flank of the NSEC cone. At daybreak, repeated collapse of unstable material from the cone’s flank (old material mixed with fragments of hot lava) transformed into hot avalanches, in particular at 06:12 UTC and at 06:57 UTC, which traveled a few hundred meters into the direction of the Valle del Bove.
During the day, observations were partly hampered by weather clouds; as visibility improved in the afternoon, the thermal surveillance camera at Monte Cagliato (EMCT) showed ongoing effusive activity, which had formed two lava flows. One of these had advanced northeastwasrd for less than a kilometer and seemed to be stagnating, whereas the other, well-fed flow was advancing eastward into the direction of the Valle del Bove (see image at lower right, recorded by EMCT on the late evening of 6 December). On the evening, Strombolian activity continued in a constant and regular manner, and the active lava flow had nearly reached the floor of the Valle del Bove. At the time this update is posted, the activity shows no variations.
Source : Avcan,
Photos : Marco Restivo , Gabriele Palma, Turi Caggegi .
Momotombo , Nicaragua :
Momotombo volcano‘s emissions of lava and ash stopped, confirmed yesterday the experts of the Nicaraguan Institute of Territorial Studies and some independent experts, but nevertheless noted that earthquakes persist as emissions of gas from the volcano.
Wilfried Strauch, seismologist and an advisor to the INETER, told the press at the end of yesterday afternoon that there is no assurance that the eruption of Momotombo, which had no activity since 1905 is completely finished, but « the lava flow now seems finished.«
He added that the exhaust of gas « is at a low level. »
The independent experts who are there say that « everything is over » and confirm that there are only gas fumes.
A team of La Prensa arrived, with Guillermo Beltran guide, Rangers from the natural reserve of Momotombo for 12 years, a few meters of lava flows, one of which is moving slowly towards the northwest, whereas a another giant lava flow moves on northwest flank of the volcano, which continues to worry the people of El Papalonal a community located about eight kilometers from the flow .The sesame producers in the same area planted 700 apple trees.
According to Beltran, lava and incandescent rocks are moving at a speed of one meter for every five hours. « The lava emitted by the volcano since Tuesday advance slowly but dangerously and reached the area of Papalonal . The community is where the lava is moving, » said the ranger.
Beltran and the team of La Prensa noted that the constant explosions stopped and the gases persist in the crater, but below, the lava moves slowly.
Source : La Prensa .
Photos : La Prensa, Salvador Antonio Caceres Urrutia
Aso, Japan :
Mount Aso in southwestern Japan’s Kumamoto prefecture had a small-scale eruption Monday morning, its first since Oct 23, the weather agency said.
The eruption spewed smoke about 700 metres above the No. 1 crater of Mt Nakadake, one of the five peaks that constitute Mt Aso, the Japan Meteorological Agency said. There have been no reports of people injured so far.
The agency maintained its volcanic alert level at 2 on the scale of 5, warning people not to approach the crater. Rocks could fall within one kilometre of the crater, it said.
« An eruption of this level can happen at any time, » an official of the agency’s Fukuoka Regional Headquarters said.
The alert level for Mt Aso was raised to 3 following its eruption on Sept 14, which warned against approaching the mountain, but it was lowered by one notch on Nov 24 amid diminished volcanic activity.
Source : Bangkokpost
Photo : Kyoto université ( 2007)