March 03 , 2017. EN. Nevados De Chillan , Etna , Fuego , Ebulobo .
March 03 , 2017.
Nevados De Chillan , Chile :
The National Geological and Mines Service of Chile (SERNAGEOMIN) describes the following information obtained by the monitoring teams of the National Volcano Surveillance Network (RNVV), processed and analyzed at the South Volcanological Observatory of the South Andes (OVDAS):
During the last week, there was a change in the volcanic activity of the Nevados de Chillan volcanic complex, represented by an increase in the occurrence of phreato-magmatic explosions from an emission center to the east of the craters Arrau and Nuevo. This after a step of relative equilibrium, which lasted for a period of a month and a half, without explosive activities. On 7 March a new stage was initiated, which produced columns at an altitude of less than 300m. Then, the internal and superficial activity increased gradually, and on March 11, 8 explosions were recorded with projections of incandescent materials dispersed over 0.5 km around the active craters, with heights of 500m and a maximum reduced displacement of 156 cm 2.
Today, another cycle of explosions began at 06:17 local time (09:17 GMT) with emission of incandescent materials and a reduced displacement of 147 cm2. Subsequently, there were eight (8) explosions, reached up to 1500 m, with associated emissions of ash.
Comparatively, the current explosions, taken individually, are less energy than the explosion that occurred on September 2, which had reached reduced displacement values of 317 cm2.
This suggests that the activity of a magmatic body to a higher level generates a process of greater interaction with the superficial hydrothermal system. Currently, in the present scenario, it is possible that new ones similar to those above or of greater magnitude are recorded following the process of destabilization of the volcanic system. Depending on the energetic nature of the process, the volcanic hazard zone remains within a radius of 3 km around the active craters. The level of volcanic technical alert is maintained at the AMARILLO level, with special attention to the evolution of the situation over time.
SERNAGEOMIN continues to monitor online and report on changes in volcanic activity in the region in a timely manner.
Source : Sernageomin
Photos : Sernageomin
Etna , Sicily :
ACTIVITY AT ETNA, 15 MARCH 2017
On the morning of 15 March 2017, a new eruptive episode started at Etna’s Southeast Crater. As during the previous eruptive episode (27 February – 1 March 2017), the eruptive vent was located in the area of the former « saddle » between the southeast Crater (SEC) and the New Southeast Crater (NSEC).
After the end of the latest eruptive episode, on the late evening of 1 March, sporadic, weak explosive activity had continued at the active vent; during the past few days this activity had shown a gradual intensification. In the early morning hours of 15 March, a small lava flow started oozing down the south flank of the SEC-NSEC cone complex. After 07:00h UTC (=local time -1), the eruptive activity rapidly intensified, and the volcanic tremor amplitude showed a marked rise. By 09:00h UTC, Strombolian explosions were nearly constant and generated modest amounts of volcanic ash that was rapidly dispersed in the atmosphere. The lava flow had reached the base of the cone and was slowly expanding on the gently sloping terrain toward south.
During the late afternoon, the lava continued to advance on top of the lava flow of the previous eruptive episode. The intensity of the Strombolian activity reached a peak around 17:40-17:45h UTC, but in the evening there was a gradual diminution of both the eruptive activity and the volcanic tremor amplitude, after which both showed fluctuations. The lava flow was no longer fed. However, shortly before 23:00 UTC, a new small lava flow was emitte from a vent on the south flank of the cone.
This morning, the tremor is still high.
To be continued.
Source : INGV
Photos : Dario lo Scavo, Graziana d’Amore.
Fuego , Guatemala :
Activity type: Vulcanian
Morphology: Stratovolcan composite
Geographical location: 14 ° 28’54˝ Latitude N; 90 ° 52’54˝ longitude W.
Weather Conditions: Clear
Wind: North at 4 km / h
Precipitation: 10 mm.
Small white fumaroles remain at a height of about 4,300 meters, (14,107 feet) scattered to the northwest, west and southwest. 18 explosions were reported with low to moderate characteristics that generated columns of gray ash at a height of about 4,400 to 4,700 meters (14,435 to 15,419 feet) moving 8 km to the northwest, West and South-West. Incandescent pulse of 150-200 m above the crater, caused the fall of volcanic materials of different sizes at a distance of 250 meters from the crater and low to moderate avalanches around the edge of the crater. The explosions were accompanied by low rumblings and noises similar to a jet turbine, with intervals of 2 to 5 minutes. Falls of ash are reported in the areas of Morelia, Hagia Sophia, El Porvenir, Pamimaché I and II, among others.
Source : Insivumeh
Photo : Luis Solano Pochet
Ebulobo , Flores Island , Indonésia :
Elevation 2124 m
Ebulobo, also referred to as Amburombu or Keo Peak, is a symmetrical stratovolcano in central Flores Island. The summit of 2124-m-high Gunung Ebulobo cosists of a flat-topped lava dome. The 250-m-wide summit crater of the steep-sided volcano is breached on three sides. The Watu Keli lava flow traveled from the northern breach to 4 km from the summit in 1830, the first of only four recorded historical eruptions of the volcano.
Source : GVP
Photo : floresles4arbres