July 21 , 2016. EN. Nevado Del Ruiz , Bromo ( Tengger Caldeira ) , Palomo , Pacaya .

Home / blog georges Vitton / July 21 , 2016. EN. Nevado Del Ruiz , Bromo ( Tengger Caldeira ) , Palomo , Pacaya .

July 21 , 2016. EN. Nevado Del Ruiz , Bromo ( Tengger Caldeira ) , Palomo , Pacaya .

July 21 , 2016.


Nevado Del Ruiz , Colombia :

Activity bulletin of the Nevado del Ruiz volcano.

The level of activity continues at:
Activity level Yellow or (III): changes in the behavior of volcanic activity.

Regarding the monitoring of the activity of the Nevado del Ruiz, the Colombian Geological Service reports that:

During the last week, the Nevado del Ruiz volcano recorded, compared to the previous week, a slight increase both in seismic activity associated with fluid dynamics in volcanic conduits as in seismicity related to the fracturing of rocks inside the volcano.

Earthquakes associated with the fracturing of the rock inside the volcano, were mainly located in the seismogenic zones of the Southeast, near the Arenas crater and to a lesser extent, in zones of the Northeast, North distal and proximal, at depths ranging between 0.25 and 7 km. The strongest earthquake was presented on July 15 at 9:39 (local time) with a maximum amplitude of 0.8 M (local magnitude) at a depth of 3.57 km, and  located in the sector South-South-East compared to the Arenas crater. It is noteworthy that during this past week, several episodes of Drumbeat type of events took place on 13, 15, 16 and 17 July, highlighting the episode of July 16, which was recorded during 2 hours, becoming the longest recorded so far. These signals are related to the growth  of domes at the  surface (1). In general, these earthquakes were of low energy.

(1) lava dome: a mound of lava (molten rock) viscous placed on the emission line of a volcano. The domes growth rate can vary from hours to days, years or even hundreds of years, and their volumes can reach tens of meters to several cubic kilometers.

Seismic activity related to fluid dynamics in volcanic conduits, was characterized by the appearance of long period earthquakes (LP) and very long period (VLP), pulses of tremors and multiple earthquakes of fluid with different energy levels. Some of the seismic signals were associated with gas and ash emissions into the atmosphere. A slight increase in the registration of tremors pulses with different energy levels and a decrease in the recording of episodes of continuous volcanic tremors, theses latter having continued to have low energy levels are highlighted. As for the location of this type of seismicity, it was mainly located in the crater and adjacent to this area and on the South and Southeast of the volcano flanks. The registration of new seismic signals of this type with higher energy levels that can be associated with gases and ash emissions into the atmosphere, which can be dispersed depending on wind conditions is not excluded.


The volcanic deformation measured from electronic inclinometers, global navigation satellite systems (GNSS) and satellite images to track changes in the tilt, the position and shape of the volcano, respectively, continued to record changes.
The volcano continues to emit into the atmosphere large amounts of steam of water and gas, including sulfur dioxide (SO2), as it was felt by the permanent stations SCANDOAS installed in the Volcano area and on satellite imagery. On monitoring of the satellite images provided by the site Mirova, no thermal anomaly has been identified.
The column of gas, steam and ash ,time to time, reached a maximum height of 500 m above the top of the volcano on 13 and 17 July. The direction of the dispersion of the column was in line with the prevailing wind in the area, which during the week showed a predominant direction towards the northwest of the volcano, promoting the dispersion of the ash on people who are in these directions.

Source : SGC

Photos : Archives


Bromo ( Tengger Caldeira ) , Indonesia :

7.942°S, 112.95°E
Elevation 2329 m

Based on satellite images, wind data, and information from PVMBG, the Darwin VAAC reported that during 13-16 and 19 July ash plumes from Tengger Caldera’s Bromo cone rose to altitudes of 2.1-3.3 km (7,000-11,000 ft) a.s.l. and drifted over 45 km NW, SW, and SE.


BNPB reported that the Abdul Rachman Saleh Airport in Malang (26 km W) closed again due to ash, from 2307 on 15 July to 0900 on 16 July; six flights were diverted and two were cancelled. Minor amounts of ash fell in the communities of Probolinggo (35 km NE) and Lumajang (36 km SW). The Alert Level remained at 2 (on a scale of 1-4); residents and visitors were reminded not to approach the crater within a radius of 1 km.

Source : GVP

Photo : Kosasih


Palomo , Chile :

The Palomo volcano, a small high edifice of 1,200 meterspresented in June and July a series of VT type of earthquakes in connection with the breaking of rocks in a 10 km radius around the volcano. The source of this seismicity is not clarified it could be purely volcanic or related to the activity of a local fault.

Photo of this volcano

Palomo is a small, 4850-m-high stratovolcano that is somewhat dissected by glaciers. A NE-flank cone, Andres, is postglacial in age and has produced andesitic lava flows. Palomo lies west of the massive Caldera del Atuel and was constructed within double calderas 3 and 5 km in diameter. The largely ice-covered Palomo has erupted basaltic-andesite to dacitic lava flows; a double crater indicates migration of activity to the NE. The youthful morphology of Palomo suggests a very recent, perhaps prehispanic, age.

Source : Bernard Duick, GVP.

Photo : Wolfgang Foerster


Pacaya , Guatemala :

14.381°N, 90.601°W
Elevation 2552 m

Conditions: Partly cloudy.
Wind North at 15 kmh.
Precipitation: 6.4mm.
The Mackenney crater shows blue and white fumaroles, moving toward the southwest at low altitude. Abundant incandescent and some small Strombolian explosions are recorded.
The seismic station PCG, records events of type B, low-frequency shocks associated with explosions and tremors.


INSIVUMEH reported some weak explosions and fumarolic emissions at Pacaya during 16-18 July. Incandescence from the crater was visible at night or early in the morning.

Source : Insivumeh , GVP

Photo : Ken Mayer

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