May 10 , 2017. EN. Sabancaya , Villarica , San Miguel , Pacaya .
May 10 , 2017.
Sabancaya , Peru :
Explosive activity increased to an average of 41 explosions per day and reduced displacement values of 125 cm2. Similarly, the number of earthquakes associated with fluid movements and the rise of magma (long period and hybrids) also increased. Between 01 and 03 May, four rock fracturing events were recorded within 25 km of the volcano, with magnitudes between 3.7 and 4.2 ML, located towards Maca, Pinchollo and Cabanaconde.
• The eruptive columns of gases and ashes reached about 3500 meters above the crater, spreading over a large radius of 40 km in a northeasterly and eastern direction.
• With the GPS method, no volcanic deformation was recorded on the volcano.
• The volcanic gas flow (SO2) reached a maximum of 1716 tonnes / day on May 05.
• 08 thermal anomalies between 01 and 31 MW of radiated volcanic energy distributed on the North, North-West and Northeast flanks of the volcano were recorded.
Overall volcanic activity shows a slight increase compared to last week.
Source : IGP.
Photo : Archive ingemmet
Villarica , Chile :
A total of 3875 earthquakes were recorded, of which 3377 were classified as long-period (LP) type earthquakes related to fluid dynamics within the volcano with lower reduced displacement values (DRCs) To 5.5 cm 2. In addition, four hundred and ninety-eight (498) volcano-tectonic (VT) events associated with the fracturing of a rigid material were classified. The higher energy event had a local magnitude (M1) of M2.5 and was 4.5 km east of the active crater at a depth of 4.2 km.
The intensity of volcanic tremors (TR), seismic signals associated with fluid dynamics within the volcano, showed average displacement values (DRC) of 2.2 cm2, which is considered low, While the dominant frequencies were between 1.0 – 2.1 Hz during the month.
Infrasound sensors installed 4 km from the volcano crater recorded minor explosions associated with surface activity in the lava lake lodged inside the main crater. The maximum value calculated was 4 Pascals reduced, but the average is about 3 Pascals reduced.
The images recorded with the IP cameras installed in the volcano area, when the weather conditions permitted to observe the upper part of the volcano, in clear weather or low cloudiness, showed a white degassing mainly with heights of column less than 550 m and a nocturnal glow.
Based on data from five (5) GNSS stations controlling the deformation of the volcano, small variations were observed, the displacements recorded by the stations both horizontally and vertically had amplitudes of less than 0, 8 cm / month. They also show that the lengths of the control lines which cross the massif remain stable, with less than 0.5 cm / month. In addition, the data provided by two (2) inclinometers have minimal variations, possibly affected by climatic factors.
Data obtained from the Differential Absorption Optical Spectroscopy (DOAS) equipment, Los Nevados and Tralco stations located 10 km Northeast (NE) and 6 km South East (SE) respectively recorded an average sulfur dioxide (SO2) emission value of 352 ± 64 t / day with a maximum value of 1112 t / day reported on 14 April. Consequently, a slight increase in S02 emissions in the second half of the year is observed, but the average monthly levels remain low.
No anomalies were recorded in sulfur dioxide (SO2) emissions in the volcano sector, according to information reported by the IMO (ozone monitoring instrument), nor thermal anomalies by the MIROVA system on its Website (http://www.mirovaweb.it/).
The parameters recorded during the month show stable energy levels in their general trend, only the increase in the number of events of type VT, which was preceded by the earthquake of VT type with local magnitude M 3.9, is set (REAV 17/03/31), possibly associated with a deep magmatic movement, which affected the volcano by generating an increase in the number of VT events. However, in spite of this activity, the system remains in equilibrium, the observed phenomena are most often associated with the dynamics of a lava lake fluctuating in an open volcanic duct system, which involve low-power degassing and the presence Sporadic minor explosions limited inside the conduit, danger associated with falling pyroclastic materials in the area adjacent to the main crater.
Therefore, the volcanic alert remains at the GREEN LEVEL: Active volcano with stable behavior – There is no immediate risk – Possible time for an eruption: months / years.
Note: It is recommended to apply restrictions on preventive access from an area near the crater with a radius of 500 m.
Source : Sernageomin
Photos : Sernageomin , Unknown.
San Miguel , (Chaparrastique ), El Salvador :
Special Report No. 9
The activity of the Chaparrastic volcano remains stable
Date and time of publication: 05/05/2017 15:00:00
During the last three days the volcanic activity of the Chaparrastic remained stable. Seismic vibration parameters of the volcano fluctuated between 81 and 112 RSAM units (Figure 1). Similarly, sulfur dioxide (SO2) emission values also decreased.
However, fluids movements within the volcanic system remain, which are evident with the periodic degassing cycles produced by the central crater.
Figure 1. So far, seismic vibrations of the volcano in May have followed a downward trend.
On this day, the images captured by the surveillance camera on the Pacayal volcano show a column of gas and vapor directed towards the southwest, amounting to about 200 meters (Figure 2).
The network of local observers reported no change in the activity of the volcano.
Figure 2. Gas and vapor plume issued at 07:55 on May 5th.
Until now, in May, sulfur dioxide (SO2) emissions have decreased to 200 t / d.
The behavior of the gas flow and seismic vibrations of the volcano is shown in Figure 3. It is likely that low levels of SO2 are due to the wind direction changing and, therefore, go beyond the scope of the monitoring equipment.
Figure 3. In recent days, the flow of SO2 emitted by the volcano has experienced a downward trend, such as RSAM vibration values.
The Ministry of the Environment and Natural Resources (MARN) is continuing its enhanced surveillance system and maintains effective communication with the Directorate General of Civil Protection and local observers.
On the other hand, the MARN calls people to stay away from the summit of the Chaparrastic volcano because of the degree of danger it represents.
Source : Marn
Pacaya , Guatemala :
Activity type: Strombolian
Morphology: Stratovolcan composite
Geographical location: 14 ° 22’50˝ Latitude N; 90 ° 36 ’00 ˝ Longitude W.
Altitude: 2552 m
Weather conditions: Cloudy
Rainfall: 0.0 mm.
Due to weather conditions, it is impossible to observe the main cone at this time. The seismic recording of the PCG station shows an internal tremor due to the rise of magma and gases towards the surface. Sounds of explosions and incandescence mainly during the evening hours are reported.
Source : Insivumeh
Photo : Insivumeh