April 04 , 2016. EN. Nevados de Chillan , Copahue , Popocatepetl , Santiaguito .
April 04 , 2016.
Nevados de Chillan , Chile :
Nevados de Chillan volcanic complex (16 to 31 March).
The level of activity of the volcanic complex is at: Yellow level, changes in the behavior of volcanic activity -Time For a probable eruption weeks / months.
Based on the analysis of information obtained from monitoring equipment and monitoring of the volcanic complex, the National Geology and Mining Service (SERNAGEOMIN) -Observatorio Volcanológico of los Andes del Sur (OVDAS) announces:
1590 seismic events were recorded, of which 151 were related to rock fracturing process, called volcano-tectonic earthquakes (VT). The biggest event was recorded with a local magnitude (ML) of m2,1 and located 5km to the South East (SE) of the active crater at a depth of 1.5 km. In addition, 1439 earthquakes associated with fluid dynamics inside the volcano have been recorded, 1348 of whom were long-term events (LP), the largest with a local magnitude (ML) of 2.6 M and a reduced displacement value (DRC) of 41,3cm2. Four ninety one were classified as tremor type events (TR), which reached a reduced displacement value equal to or less 2,5cm2.
Note that the 18 saw a change in seismic activity with the recording of repetitive events (REAV March 18, 1:50 p.m. HL), with low power, but significant from a qualitative point of view.
The LP type of seismicity and the tremor was associated with ash emissions. The most notorious was registered on 30, accompanied by a LP type event with a displacement reduced equal to 25 cm 2 and a low-energy tremor (DRC = 1 cm2) which continued for hours.
Sulphur dioxide (SO2) recorded on the Nevados de Chillan volcanic complex, by the team DOAS (Differential Optical Absorption Spectrometry), Chillan Station, located 3 km to the east-northeast (ENE) of active crater, presented an average value of 1292 ± 730T / day and a maximum value observed during the first two weeks at 2743t / day, registered on 20 March. In particular, due to the pulsating nature of the eruption process, the values of SO2, have high variability. The intermittent degassing in the process, was tested by evaluating the SO2 emissions with the infrared camera (IR), which recorded SO2 rate values close to the detection limit, measurements made during the months of January and February .
The images obtained through the network of cameras installed in the area showed surface activity mainly characterized by the emission of a white plume associated with the water vapor. Sporadically emissions were accompanied by ash, often with a long period seismicity (LP) and tremors (TR), the largest on March 30 with the explosion mentioned above, in which the height of the ash column reaches 200 m. about.
Although the height of the column was low, it was characterized by a high concentration of ash.
According to the analysis of data provided by two (2) electronic inclinometers and five (5) GNSS stations that monitor the deformation of the surface of the volcanic complex, small variations were observed in the morphology of the volcano.
In particular, the GNSS signals indicate variations, mainly horizontal components, resulting in an increase of the distance between two stations that make up a control line passing through the volcano, suggesting moderate inflation.
The images published by the OMI Group (Ozone Monitoring Instrument) Sulfur Dioxide Group (http://so2.gsfc.nasa.gov/) and NESDIS (National Environmental Satellite, Data and information- http: // satepsanone. nesdis.noaa.gov) reported no abnormality in sulfur dioxide (SO2) in the area near the volcanic complex.
Thermal radiation released by the MODVOLC (Moderate Resolution Imaging Spectroradiometer – http://modis.higp.hawaii.edu MODIS) and Mirova (Middle InfraRed, Observation of volcanic activity) on its website (http: // www. mirovaweb.it /), surveillance systems that indicate significant changes in surface temperature, reported no heat alert in the area associated with the volcanic complex.
Monitoring of the parameters during the last fortnight has shown that the activity continues in a process of interaction between hydrothermal system and the magmatic system, with signs indicating greater dynamic heat flow from the magmatic body underlying .
In this scenario the possibility of generating new phreatic explosions and / or phreatomagmatic eruptions of currently active craters continues.
Therefore, the volcanic alert level remains at yellow.
Source : Sernageomin .
Copahue , Chile :
Copahue volcano (March 16 to 31).
The level of activity of the volcano is at: Level YELLOW, changes in the behavior of volcanic activity -Time For a probable eruption weeks / months.
Based on the analysis of information obtained by monitoring equipment and surveillance of the volcano, the National Geology and Mining Service (SERNAGEOMIN) -Observatorio Volcanológico of Los Andes del Sur (OVDAS) announces:
During this period, fifty-four (54) seismic events were registered, twelve (12) were classified as volcano tectonic (VT) associated with rock fracturing process.
Similarly, forty-two (42) events associated with the fluid dynamics inside the volcano , twenty-nine of which (29) were identified as long-period earthquakes (LP) and thirteen (13) as events very long period (VLP) were recorded.
Regarding seismic activity type VT, the local magnitude (ML) are less or equal to M1,5. The most important energy event was located on the northeast side (NE) to 17.6 km of the El Agrio crater with a depth of 4.5 km.
Regarding LP type of events, they showed reduced displacements values (DRC) below 14,4cm2, the local magnitude (ML) was less than M1,9 and mostly situated around the crater.
Seismicity VLP has local magnitude (ML) lower to M1,8 and reduced displacement values (DRC) of 21,3cm2 maximum, mostly located around the crater with epicentral distances of less than 4,0 km.
Throughout the month, there was a constant tremor signal, mainly associated with particulate emissions (gases and ash) from the crater El Agrio, which reported reduced displacement values (DRC) oscillating around about 3 cm2, values considered as intermediate for this volcano. The dominant frequencies are concentrated in a bandwidth from 1.0 to 2.0 Hz.
From the data obtained from five (5) GNSS stations, which measure the deformation of the surface of the volcano, it is noted that the horizontal and vertical components have low amplitude variations. The maximum displacement rate is calculated at 0,19cm / month for the horizontal components and 0.25 cm / month for the vertical component.
In addition, the control line that crosses the volcano indicates a tendency to increase at a lower rate of 0.3cm / month, according to a slight inflation.
Sulfur dioxide emissions (SO2) recorded on the volcano Copahue by the team DOAS (Differential Optical Absorption Spectrometry) Triplets station, located 5 km to the east–northeast (ENE) of the active crater has experienced a mean value of 853 ± 189 t / day and a maximum value observed during the first two weeks of 2830 t / day, recorded on March 23. The average flow is considered at low levels for this volcano.
IP cameras installed near the volcano recorded the constant emission of material from the active crater (El Agrio)accompanied by night glows . These emissions are mostly characterized by a gray color, showing the presence of particulate matter.
The maximum height of the column was 1500 m observed on March 22.
The same pattern of activity of the volcano continues, linked to the interaction of a low volume of magma body at a level more or less deep into the volcanic edifice, with the surface hydrothermal system without unbalancing, keeping a metastable equilibrium. This activity may continue for a long time. No specific increase related to small phreatic explosions and / or low strombolian activity in the crater area is rejected. Therefore, is considered high risk zone that contained in a radius of 1.5 km around the crater el Agrio and therefore it is recommended to restrict access to this sector remaining at technical level of alert Yellow .
Source : Sernageomin
Photos : Suyay Abou Adal , Volcanes Andinos .
Popocatepetl , Mexico :
April 2 5:00 p.m. (2300 GMT April 02)
Today took place with the support of the federal police, an reconnaissance overflights of the crater of Popocatepetl . It was observed the destruction of the lava dome that was formed last January and reached an estimated volume of 2,000,000 cubic meters. Instead, it is an inner crater , with 325 meters in diameter and 50 meters deep. On the east wall of the inner crater was observed that small landslides occurred, leaving debris on the crater floor. Various fumaroles were also observed in the northern areas, South and East.
The Semaphore volcanic alert of Popocatepetl volcano is located in Amarillo Phase 2.
April 2, 11: 20h (17:20 GMT April 02)
In the last 24 hours, through the seismic recordings of the Popocatepetl volcano monitoring system, 38 exhalations were identified, the most important were recorded yesterday at 13:07 pm and at 06:38 pm today.
In addition, it was recorded 18 minutes of harmonic tremor of low amplitude.
At night, a glow which has increased in certain exhalations was observed.
This morning, until the time of this report, continued emissions of steam and gas moving to the Northeast are observed.
CENAPRED urged not to approach the volcano and in particular the crater, because of the danger of ballistic fragments fallout.
Source : Cenapred .
Santiaguito , Mexico :
Bulletin special Volcanologic
Activity type : Peléenne
Morphology : Complex of dacitic domes
Geographical location: 14 ° 44 ‘33 « North Latitude, 91 ° 34′ 13″ West Longitude.
As reported, the Santiaguito volcano has entered a new phase of high activity.
Santiaguito Volcano Observatory‘s (OVSAN) reports another strong explosion, accompanied by pyroclastic flows in the direction of the zone of collapse left by the eruption of 9 May 2014, and to the west, in the San Isidro Canyon of the volcanic complex.
This activity generated by the collapse in the east and west of the crater emits clouds of ash to an altitude of 4000 meters, moving to the South, Southwest, West, North Westover a distance of 30 km, but continuously moving. It is estimated that due to the fineness of ash can reach the same distance as other events, like yesterday, which reached more than 100 kilometers on the northwest flank.
It is estimated that this could cause ash precipitation in El Nuevo Palmar, San Felipe Retalhuleu, Retalhuleu, the villages of Loma Linda, San Marcos, Monte Bello, Palajunoj and others on this side.
Santiaguito is in a high explosive phase, so that more or less similar events may be generated in the time and \ or days. For this, we must not remain near the volcanic complex, because it can be generated large pyroclastic flows.
Therefore, the INSIVUMEH recommends:
At the CONRED, to take the necessary precautions, vigilance, implementation of precautions it deems necessary to the air near the volcanic complex, mainly because of falling ash which can contaminate drinking water and cause respiratory problems.
At the Directorate General of Civil Aviation, to take precautions with air traffic, such as ash moves south directions, southwest, northwest, at 4500 m high, with a potential for being transported over distances of more than 50 kilometers
Source : Insivumeh
Photo : Quetzal Tour