August 10 , 2016. EN. Etna , Nevados de Chillan , Nevado Del Ruiz , Cleveland .
August 10 , 2016.
Etna, Sicily :
ETNA UPDATE, 9 AUGUST 2016
The sequence of summit eruptions at Etna in May 2016 ended with two episodes of intense Strombolian activity, at the Northeast Crater (NEC) during the night of 22-23 May, and at the Voragine (VOR) between the afternoon of 24 May and the evening of the 25th. For several weeks thereafter, the volcano showed no signs of activity until mid-July, when weak ash emissions resumed from the eruptive vent located high on the east flank of the New Southeast Crater (NSEC) cone, which had formed on 25 November 2015. These emissions continued in a discontinuous manner until early August; images recorded by the thermal camera at Monte Cagliato (EMCT) showed a graudal and slight increase of the temperatures of the emissions.
On the evening of 7 August, weak, pulsating glows were noted at the VOR, which were produced by mild intracrater explosive activity (see image at left, recorded by the high-definition camera at Monte Cagliato, EMCH, at 18:59 UTC or 20:59 local time). No eruptive products were ejected outside the crater rims. This activity is continuing as of 9 August evening. There are no significant variations in the amplitude of the volcanic tremor.
The activity of Etna is monitored continuously by the systems of video and thermal cameras, seismic stations and ground deformation.
Source : INGV Catane.
Photos : INGV, Turi Caggegi , Boris Behncke.
Nevados De Chillan, Chile :
Special volcanic activity report (REAV)
August 9, 2016 16: 00hrs (local time).
The National Geology and Mining Service (SERNAGEOMIN) describes the following information obtained by the National Network monitoring teams of volcano monitoring, processed and analyzed at the Volcanological Observatory of Southern Andes, interpretation center of SERNAGEOMIN data :
The volcanic activity in the volcanic complex Nevados de Chillan (CVNC) showed variations during the first week of August, represented by the increase in energy-related to the signals of explosions, whose numbers have also increased as well as emissions of particulate material from the active craters formed this year in the East (E) of the volcanos Nuevo and Arrau. During the first nine days of the month were recorded a total of 11 explosions, the more energy was held yesterday at 16:56 local time (8:56 p.m. GMT), which presented a seismic signal with a reduced displacement value of 58 cm2 , value considered to be moderate, and that led to a column of about 2 km above the emission center.
Before the explosive event, it was recorded a type of seismicity named Tornillos (TO) (interpreted as the fluid pressure effect), suggesting an increase in temporary internal pressure in the volcanic system which would have led the surface activity detected yesterday.
A survey conducted on August 5 allowed to record the surface temperature of the system by measuring a maximum of 60 ° C. In spite of the low temperatures of activity recorded, this suggests that the activity could be linked to the excitement of the shallow hydrothermal system driven by heat transfer from a deeper magmatic system, perhaps located 3-5 km below the surface.
In the current scenario the appearance of new particulate emissions of similar size or even slightly higher than those recorded is possible, in relation to the deep hydrothermal system destabilization process driven by the activity of a magma body underneath. Due to the « increase energy processes, the high volcanic risk area is prolonged in a radius of 3 km around the currently active craters, representing mainly the reach of the products of the strongest explosions and the effect of such one on the cover of snow on top of the volcano.
The latter situation will be constantly re-evaluated depending on the evolution of the process.
The level of technical volcanic alert remains at yellow level, with particular attention to its evolution.
SERNAGEOMIN continuous online monitoring and report timely to the changes in volcanic activity in the region.
Source : Sernageomin .
Nevado Del Ruiz , Colombia :
Weekly bulletin of activity of the volcano Nevado del Ruiz, from August 2 to August 8, 2016
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 recorded, compared to last week, similar values in terms of seismic activity associated with the fracturing of the rock inside the volcano as well as a slight decrease seismic activity related to fluid dynamics inside volcanic conduits.
Earthquakes associated with the fracturing of the rock inside the volcano, were mainly in the seismogenic sources of the South-South-West, South-West, North-East, and to a lesser extent in the sectors South East proximal, distal North and near the Arenas crater at depths between 0.3 and 7.0 km. The earthquakes of higher energy took place on August 2 at 23:55 (local time) with a maximum magnitude of 1.2 ML (local magnitude) at a depth of 3.0 km, located in the South -South-West of Arenas crater and on August 3 at 11:41 (local time) with a maximum magnitude of 1.2 ML (local magnitude) at a depth of 4.4 km, located in the southwest sector of Arenas crater. An increase is noted, occurred on both days 02 and 03 August, located in South-South – West and South-West of the Arenas crater at depths between 2.0 and 4.4 km.
Seismic activity related to fluid dynamics in volcanic conduits, was characterized by the appearance of long-period earthquakes (LP) and very long period earthquakes (VLP), pulses of tremor, short episodes of continuous tremor and several earthquakes caused by the fluids, with variable energy levels. Some of the seismic signals were associated with gas emissions and ash into the atmosphere. The decrease in recording seismic signals related to fluid dynamics in volcanic pipes is found.
The volcanic deformation measured from electronic inclinometers, global navigation satellite systems (GNSS) and satellite images to track changes in the tilt, of position and shape of the volcano, respectively, continued to record Changes.
The volcano continues to emit into the atmosphere large amounts of water vapor and gases, including sulfur dioxide (SO2), as it was felt by the permanent stations SCANDOAS installed in the Volcano area and on satellite imagery. In the monitoring of satellite images provided by the portal Mirova, a thermal anomaly of low energy has been saved.
The column of gas, steam and ash, reached a maximum height of 850 m above the top of the volcano, on August 6. 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 populations who are in these sectors.
Source : Ingeominas.
Cleveland , Alaska :
52°49’20 » N 169°56’42 » W,
Summit Elevation 5676 ft (1730 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW
Nothing observed in cloudy satellite images over the past day. A low-level steam plume was observed in several clear web camera images. No significant activity observed in seismic or infrasound (pressure sensor) data over the past day.
Source : AVO
Photo : Werner, Cindy