February 27 , 2016. EN. Bromo , Tungurahua , Momotombo, Masaya , Telica .
February 27 , 2016.
Bromo, Indonesia :
During the period from 18 to 25 February 2016 it was recorded six earthquakes, earthquakes of eruptions and continuous tremors with maximum amplitude ranges from 1 to 24 mm. From the date of February 22, 2016, the seismic tremor was recorded continuously with a maximum magnitude of 0.5 to 2 mm, earthquakes eruption were not recorded.
The deformation monitoring of G. Bromo is done using the method EDM (electronic distance measurement) and inclinometers. The EDM method that consists of three monitoring points and permanent checkpoints, G. Kursi, Bromo and Mount Batok, this measure has often been hampered by the fog around Mount Bromo.
The tilt and EDM measures within a period of 2 to 26 February 2016 using a new measuring point and EDM, the measurement results of the February 10 until February 25, 2016 show that deformation varies with a stable trend.
The visual activity of G. Bromo is often shrouded in fog. An emission of thick white smoke gray with a high column of 50 to 900 meters high with a change in direction between the North-East and West–Southwest is present, the roar over the last five days were not present.
The recording of the seismicity is dominated by a constant tremor with a maximum amplitude which fluctuated in the range of 1 to 30 mm and on February 22, 2016, the maximum tremor dominant amplitude was 0.5 to 2 mm . Earthquakes eruption were not recorded again.
Measurements of deformation with tilt and EDM shows fluctuations and a stable trend.
Seismic activity is dominated by continuous tremor vibration with an amplitude in decrease, earthquakes of eruptions were not recorded again.
The threat of an eruption in the form of emission of ash and jets of material could produce up to a radius of 1 km.
Based on observational data and analysis of seismic data, visual, and the potential danger of eruption, the activity level of G. Bromo goes from the Level III (SIAGA) to level II (Waspada) on 26 February 2016.
The activity level of Bromo will be raised / lowered if an increase / decrease of the activity is recorded extensively by experts of the Centre for volcanic risk mitigation, volcanology and geology.
Source : VSI
Photos : Oystein Lund Andersen ( archives), G Vitton.
Tungurahua, Ecuador :
Explosions on Tungurahua. February 26, 2016 (4:45 p.m.)
At 1:33 p.m. (TL) there was another explosion, which generated some small pyroclastic flows, which reached halfway of the volcano. They descended on the West and Northwest flank, as seen in the image taken by the camera on the Mandur sector (Fig. 1).
Fig. 1: image taken at 15h10TL by the thermal camera of Mandur, showing the traces of pyroclastic glowing flow that descended halfway the cone on the northwest part, specifically in the gullies of Mandur, Hacienda and Cusúa. .
Then at 15:35 (TL) has again produced a pyroclastic flow that came down from the top to the ravines Mandur , Hacienda, Cusúa , and probably Pirámide. This new flow also advanced to the middle of the volcano and was not caused by an explosion but by the phenomenon known as « boiling over », which corresponds to a discharge of a small amount magma and / or debris from the crater, in the West–Northwest sector of the crater rim.
As regards the seismic Activity, continuous tremor of large amplitude is maintained.
In summary, there have been five explosions with the following parameters:
02.26.2016 12:11 : Column with a height of 5 km above the crater level.
02/26/2016 12h39 : Approximate height of 6 km.
02.26.2016 12:47 : Column with a height of 6 km.
02.26.2016 12:52 : Elevation 6-7 Km
02/26/2016 1:33 p.m : Generating pyroclastic flows, column height about 8 km.
After the explosions, it started falling ash in the areas of El Manzano, Choglontús, Pillate, Juive and recently in Ambato and Quero.
The ashes were characterized as thin, sugar grain size. However, in the sector of Pillate and Choglontús, ash grain size was as high as 3 mm and consists of rock fragments reddish, black, gray and beige.
During the explosions, detonations and rumblings were heard from Pillate and El Manzano. Note that most of the time the volcano remained partially covered, therefore not possible to have a clarification on the heights of the issuance of the columns. However, from the camera ECU911 in Ambatillo he was taking a picture of a column of 5 km, filling the crater and composed of a high ash content.
Fig. 4: Photo by Ambatillo camera 911 ECU, corresponding to the eruptive column associated with the explosion of 12h11TL.
As noted, at this time, the volcano has not reduced its level of activity that remains moderate, there is a continuous emission column to the west with a moderate ash content.
New explosions may occur in the coming hours. For this reason, we suggest that the population of the areas of influence of the volcano remain in alert to the reports that are broadcast regularly by IGEPN.
Source : IGEPN.
Photos : IGEPN, José Luis Espinosa Naranjo.
Momotombo, Masaya , Telica, Nicaragua :
Activity Bulletin February 26, 2016
Since 12:00 yesterday until 12:00 today, the Momotombo volcano recorded 4 new explosions, the strongest recorded at 9:21 p.m. yesterday, who issued incandescent materials were deposited on the flanks Northeast, East and Southeast of the volcano.
The ashes expelled totaled at least 1,000 meters above the crater. The latest explosion occurred at 9:59 am, which raised a small column of gas and ash about 300 meters above the crater.
So far, a total of 60 explosions were recorded on the Momotombo since he began his recent activity, which occur more frequently in recent days, but with less intensity that at the beginning of this month.
Seismic amplitude in real time (RSAM) of Momotombo is low to moderate, with values between 55 and 130 units.
In the last 24 hours, 4 earthquakes were recorded near and inside the caldera of the Masaya Volcano, with magnitudes between M1,2 and M1,7.
These small earthquakes are characteristic of the volcanic activity of the Masaya volcano.
The activity of the lava lake in the crater Santiago continues, and the process of enlargement of the mouth in the bottom of the crater, where lava lake is observed.
The volcanic tremor of the volcano remains high, and seismic amplitude in real time (RSAM) is high to very high, between 250 and 1,100 units.
The glow remains in the crater of Telica, where the presence of magma to the surface is observed.
The micro-seismic activity remains high due to magmatic surface activity and small gas explosions that occur inside the crater.
Seismic amplitude in real time (RSAM) is low to moderate, with values between 60 and 140 units.
Source : Ineter.
Photos : Michael A Urbina, allymagenmochila.