April 27 , 2017. EN. Etna , San Miguel , Poas , Nishinoshima , Popocatepetl.
April 27 , 2017.
Etna , Sicily :
New eruption of the crater of the South East.
Shortly after 18h, on April 26, 2017, activity took over on Mount Etna.
Until now, no press release from INGV.
Activity increased during the night, becoming strombolian. Around 5:40, on the 27th, a lava fountain was visible, feeding a stream in the direction of the Valle del Bove.
A fissure appeared on the northern wall of the southeast crater fed a second flow in a northeasterly direction.
The activity thus concerns four events, at least, and generates two lava flows
Etna seen from Linguaglossa this morning, a lot of mist because of the large emissions of gas and ashes from the south-east crater and the continuing volcanic activity on the south side of the volcano.
Source : B Behncke , Salvatore Lo Giudice , B Duick.
Photo : B Behncke, Salvatore Lo Giudice.
San Miguel ( Chaparrastique) , El Salvador :
The Chaparrastic Volcano continues to show changes
Date and time of publication: 24/04/2017 13:35:00
Changes in the seismic vibration patterns of the Chaparrastic volcano continue to fluctuate, this type of seismicity is related to fluid movements within the volcanic system and are manifested with periodic degassing cycles observed from the central crater.
During the last 24 hours, the Chaparrastic Volcano continues to show variations in the recording of its internal seismic vibration, which oscillated between 88 and 123 units on average / hour (the standard value considered is 50 units [see figure 1]).
Figure 1. Seismic vibration continues to fluctuate.
During April, sulfur dioxide (SO2) emissions fluctuated between 68 and 809 tonnes per day (Figure 2). Recorded volcanic gas emissions are considered significant and characteristic of an active open volcanic duct system with continuous injections of magmatic fluids.
The low values in Figure 2 are due to the direction of the wind which has been fluctuating. These days its predominant direction was north and north-northeast of the volcano, affecting the detection of plume gases at the observation site (south-east of the volcano).
Figure 2. Emission values continue to fluctuate.
The images captured by the surveillance camera located on the El Pacayal hill show that the volcano continues its degassing of the central crater, the columns sometimes rise to about 450 meters. Vapors and magmatic gases are carried by the prevailing wind in the region. (Figure 3).
Figure 3. Pulse of the volcanic gases of the crater of the volcano.
Records of seismicity and gas flows emitted by the crater show continuous fluctuations, evolving over time. These changes indicate that the volcano is still active and may have sudden changes in its behavior.
The Ministry of Environment and Natural Resources (MARN) is continuing its enhanced surveillance system and maintains close communication with the Directorate General of Civil Protection and local observers.
The MARN calls the population to stay away from the summit of the Chaparrastic volcano because of the degree of danger it represents.
If significant changes occur there will be published a special report.
Source : Marn .
Poas , Costa Rica :
Poas Volcano Activity Report, 26 April 2017, updated at 11: 30 hours
Volcanic activity in the last 24 hours:
During the last 24 hours, Poas volcano have recorded few and small phreatic eruptions. A very small amplitude volcanic tremor seismic signal is recorded almost continuously, which is consistent with the presence of a vigorous plume of vapor, gas and aerosols that rises vertically above the bottom of the active crater on A height of 1 km.
There have also been numerous long-term earthquakes, LPs, and some volcano-tectonic earthquakes, VTS, movement associated with rock fracturing and fluid movements (water, gas, magma). In the active crater of the Poas, at the site where eruptive activity is concentrated, a cone continues to form due to the low-level ejection of rocks, fragments of bright red fresh lava, hot ash and lacustrine sediments.
Yesterday, April 25, at 10:31 pm, the inhabitants of Fraijanes de Poas reported an acrid odor of volcanic gases. During the day, the plume of water vapor, gas and aerosols was dispersed mainly northward and to a lesser extent to the west-south-west and south of the volcano.
In the photo above we see an interesting rock emitted by the strong eruption of the Poas from 22 April to the evening. This and other rock and ash samples are studied in detail by Dr. Geoffroy Avard at the Petrology Laboratory of OVSICORI-A.
Source : Ovsicori .
Photos : Ovsicori.
Nishinoshima , Japan :
2 new craters observed on Nishinoshima
27 APRIL 2017. Lava has been seen flowing out of craters on Nishinoshima island — where a volcanic eruption recently occurred for the first time in 1 year and five months — reaching the coast on Tuesday.
It was confirmed by a Yomiuri Shimbun aircraft on the day.
“The volcanic activity is certainly lively, as at least two craters have newly formed,” said Fukashi Maeno, an associate professor of volcanic geology at the University of Tokyo’s Earthquake Research Institute who was on board the aircraft. “I think the island will expand more.”
The eruption was confirmed on April 20 on the island, which is under the jurisdiction of Ogasawara, Tokyo, and located about 1,000 kilometers south of central Tokyo. The Japan Meteorological Agency issued a warning for the area near the crater. The previous eruption on the island took place on November 2015.
From the aircraft, eruptions could be seen occurring about dozens of seconds apart on Tuesday, with clumps of lava and gray smoke rising hundreds of meters into the air from the craters. A stream of glowing lava was also seen forking toward the west and the south sides of the island. On the west side, the lava was observed reaching the sea.
The latest eruptions are classified as “Strombolian type” eruptions that comprise a series of outbursts of cinders and clumps of lava, according to the Japan Coast Guard.
Source : JAPON NEWS
Photo : Yomiuri Shimbun
Popocatepetl , Mexico :
26 April 11:00 (16:00 GMT April 26)
In the past 24 hours, through seismic recordings of the Popocatepetl Volcano monitoring system, 40 low-intensity exhalations and eight explosions, seven yesterday at 12:20 pm, 3:37 pm, 5:40 pm, 6:15 pm , 6:21 pm, 7:05 pm and 7:35 pm and one today at 9:24 am were identified. Most were accompanied mainly by water vapor, gas and small amounts of ash. In addition, it was recorded 10 minutes of harmonic tremor.
During the night and early morning, a glow above the crater was observed.
This morning until the time of this report, a continuous emission of gas and steam was observed east-northeast.
CENAPRED asks not to approach the volcano and in particular the crater.
The volcanic warning semaphores of the Popocatepetl Volcano are located in Amarillo Phase 2.
Source : Cenapred .
Photo : Webcamdemexico