June 22 , 2016. EN. San Miguel (Chaparrastique) , Santiaguito , Copahue , Hekla .
June 22 , 2016.
San Miguel (Chaparrastique), El Salvador :
The technicians of the Observatory of the environment continue to monitor the activity. Yesterday, two volcanologists repeated temperature measurements and sulfur dioxide from the crater. The determined temperature is below 100 degrees Celsius, although, according to the expert, Demetrios Escobar, it remains high.
Until yesterday, the gas plume from the crater was dense, but much less than on Saturday after the explosion which took place at 04:00.
It is no longer saturated with ashes as the first day, but the emission still contains gas cloud blown by the wind to the north and the west flank of the volcano.
The strong degassing is carried by the wind and can affect the population in the lower area of the volcano according to its direction, which is mainly to the southwest of the crater
These changes have presented evidence that the volcano is active. Fluctuations in controlled settings are saved and frequently observed, and indicate anomalies in the system.
Given the current activity, the emergence of new low to moderate amplitude explosions is not rejected. However, the monitored parameters continue to rise, the scenario could become an effusive eruption of magmatic material either through the central crater or on the slopes of the volcanic structure.
In the last 24 hours, the measurement of the seismic amplitude recorded at the seismic station VSM, located at 1,700 meters altitude on the north flank of the volcano fluctuated between 174-237 units RSAM / hour on average, with a average of 221.
The gases from the volcano’s crater are carried by the wind to the Southwest, so that communities living in the area may perceive the smell of sulfur. In response, the use of masks or wet tissues is recommended when noticed a smell of sulfur and it is advisable to try to leave the area.
This type of volcanic activity can continue, it is recommended not to be at the top of the cone because of the danger of ejected material fall by an explosion, as well as also because of the risk of breathing at high concentrations of magmatic gases in the crater area.
MARN continues its enhanced surveillance of the volcano, maintains close communication with the General Directorate of Civil Protection and local observers. MARN invites journalists and people not to approach the summit of the volcano, because of the degree of danger that this represents.
Source : Marn
Santiaguito, Guatemala :
Guatemala: Santiaguito Volcano undergoes several changes
Representatives of the National Coordinator for Disaster Reduction of Guatemala (Conred) report changes in the Santiaguito Volcano. Conrad staff in Retalhuleu reported that the Santiaguito volcano tends to widen due to the intense activity that has been maintained.
Pedro Perez, coach of the National Coordinator for Disaster Reduction (Conred), in Retalhuleu, said the recent activity of the volcano, has caused changes in its structure, because the material located in the crater area is being removed causing it to widen.
He added that an explosion last Monday night registered a thunderstorm caused due to the particles released by the volcano and having positive and negative charge.
A newsletter published by the National Institute of Seismology, Volcanology, Meteorology and Hydrology of Guatemala (Insivumeh) specifies that at 22.39 hours on the last Monday, a loud explosion that sent ash particles to 5000 meters above sea level was recorded.
In Coatepeque, Quetzaltenango, residents reported that a thin layer of ash covered crops, vegetables and roofs of houses, and in some communities south of San Marcos.
The Santiaguito volcano is located in the department of Quetzaltenango, in the western highlands of Guatemala at 2550 meters altitude.
Located 11 km from the city of Quetzaltenango, it is visited by many tourists and local mountaineers who are attracted by the adventure that represents observe their explosions and admire a hostile landscape, compared to other volcanoes in Guatemala.
Among the peculiarities of this volcano is its location, attached to the foothills of the Santa Maria volcano.
Source : TN8
Copahue , Chile :
The level of activity of the volcano is at:
LEVEL YELLOW: changes in the behavior of volcanic activity – time likely for an eruption weeks / months.
– During this period 332 seismic events were recorded, seventeen (17) were classified as volcano-tectonic (VT) associated with rigid material fracturing processes. Similarly, three hundred and fifteen (315) events associated with dynamics of fluids inside the volcano, identified as volcanic earthquakes long period (LP) and very long period (VLP) were recorded.
– Regarding the seismicity VT, their local magnitude (ML) was less or equal to M1,5. The higher energy event was located on the southeast flank (SE), at 5.3 km to El Agrio crater with a depth of about 8.2 km.
– Regarding the events related to fluid dynamics, LP type of events , they presented local magnitude (ML) under M1,2, while VLP events presented local magnitude (ML) below M1 , 7; these events were located around the crater.
– Throughout the month, it was noted a constant tremor signal, increasing slightly in magnitude in recent days and mainly associated with the release of particulate matter (gas and ash) from El Agrio crater. The dominant frequencies are generally concentrated in a bandwidth from 0.5 to 2.7 Hz, except for the last days where the frequency range was between 3.5 and 4.0 Hz combining the characteristics of the tremor and continuous and repetitive LP events, signal characteristics in the previous process of the volcano.
– From the data obtained from the four (4) GNSS stations, the deformation of the surface of the volcano appeared stable.
The sulfur dioxide emissions (SO2) recorded on the Copahue volcano by the team DOAS (Differential Optical Absorption Spectrometry) Triplets Station, located 5 km to the east-northeast (ENE) of the active crater has a mean value of 1844 ± 2040 t / day and a maximum value of 5848 t / day, raised on June 8, this value is considered high for this volcano.
– IP cameras installed near the volcano have seen a steady gas emissions from active crater (El Agrio), a glow was observed throughout the period. However, in recent days, there have been specific increases in the intensity and height, of gas fumes associated with a higher temperature and possibly small phreatic explosions or « projections » of ballistic objects limited to the crater area.
– Thermal radiation released by Mirova (Middle InfraRed Observation) on its website (http://www.mirovaweb.it/) and MODVOLC (Moderate Resolution Imaging Spectroradiometer) MODIS on its website (http: // modis .higp. hawaii.edu /), surveillance systems that indicate significant changes in surface temperature, noted thermal anomalies that were observed during the first two weeks, the 04, 08, 11, 13 and 14, with recording a maximum radiative power value (PRV) 14 MW on June 14, considered as moderate value.
This suggests a new intrusion of magma in the surface layers, may be a small volume as a function of the absence of significant signs of deformation of the volcano. Therefore, is considered high risk zone that contained in a radius of 1.5 km around the crater El Agrio and it is recommended to limit access.
Source : Sernageomin.
Hekla , Iceland :
Iceland’s Hekla volcano eruption could spark ‘major disaster’ at any moment, experts warn.
A volcano in Iceland could prompt a « major disaster » with an eruption at any moment, a geophysics expert has warned. Located in the southern part of the country, Hekla last erupted in 2000 and scientists say another could be due – potentially causing widespread disruption to flights across the continent.
And geophysics professor Páll Einarsson, from the University of Iceland, warned people not to travel to the volcano, which is popular with tourists. According to the professor, readings from inside the volcano are higher than before its last two eruptions, meaning it could blow at any minute after 16 years of silence. “Hekla is a dangerous volcano, » he told Icelandic news website Visit.is. “We could be looking at a major disaster when the next eruption begins if we are not careful.
Hekla eruption – the plane on the left gives the scale of the ash plume – photo RAX / Visir.is, undated
“Hekla has become a very popular tourist destination. Nowadays, there are tourist groups on Hekla most of the summer. “There are also 20-30 planes full of passengers flying right over the top of Hekla every day.” The country has some of the world’s most active volcanoes, with close monitoring of 30 out of 130 on the island classed as live volcanic systems.
Professor Einarsson explained measurements indicated Hekla had been gathering magma, and that internal pressure was considerably higher than it was before its last eruptions. Prior to 2000, Mt Hekla had erupted regularly every decade since 1970. Professor Einarsson added: “This is a risky moment which we need to take seriously. “Hekla is ready – at any moment.”
Source : L’ INDEPENDANT
Photo : Rax