March 19 , 2016. EN. Nyiragongo , Copahue , Cascade Range ( St Helens) , Masaya .

Home / blog georges Vitton / March 19 , 2016. EN. Nyiragongo , Copahue , Cascade Range ( St Helens) , Masaya .

March 19 , 2016. EN. Nyiragongo , Copahue , Cascade Range ( St Helens) , Masaya .

March 19 , 2016.

 

 

Nyiragongo, Democratic Republic of Congo .

REPORT of MISSION on the Nyiragongo volcano , 10 TO 11 March 2016

I.INTRODUCTION
A team from the Volcanological Observatory of Goma (OVG) has conducted a mission to Nyiragongo volcano dated 10 to 11 March 2016. This mission was a follow-up of the activity of the volcano observed for nearly two weeks .

II.COMPOSITION TEAM
-KWETU Sambo Gloire : Researcher at the OVG
-MUKAMBILWA Kibuye Pierre : Researcher at OVG
III. Duration of the mission
This mission lasted about two days , from the 10 to 11 March 2016.

 

 


IV. Objectives of the mission.
Appreciate the magmatic activity of the Nyiragongo volcano particularly the flow level of the lava from the new secondary wells to the main well and its effusion on the 3rd platform.
– Assess the level of the lava lake from the main well and from the secondary wells and their current level of activity.
– Perform measurements of temperature and extensometer on the southern flank of the Nyiragongo volcano.
– Perform topographic measurements of the crater of Nyiragongo volcano.

V. RUNNING OF THE MISSION.


Starting at 7am from the Observatory, the team arrived at the summit of Nyiragongo volcano around 16h and commenced direct observations of the crater.
From these it emerges that:
The flow from the new secondary well continues on the third platform in two directions north and south.
. She continues to accumulate on this one and has already passed over almost its entire surface. Since the morning of March 11, 2016 that flow has begun to flow into the main well, but it is still at a slow speed.

The activity of the secondary well remains intense with fountains and intermittent explosions. These fountains can reach ten meters.
The level of the lava lake from the main well remains low but its activity remains intense and concentrated primarily sometimes to the North sometimes to the East.
– The deformation measurements taken on March 11, 2016, show no significant deformation of the Nyiragongo crater.

 

nyiragongo

Temperature measurements in fractures:

Temperature measurements were made at the level of summit of Nyiragongo, at the level of the hut and at the level of Shaheru.
Temperature readings in the cracks of the summit (South side) at Shaheru and Cabane show a slight decrease in temperature; which means that the activity is still concentrated in the crater and fractures are not yet supplied.
Overall, the average daily temperature does not accuse considerable differences for the three months considered.
however we note that the month of February 2016 and March 2016 accusing some small fluctuations

CONCLUSIONS AND RECOMMENDATIONSFrom our observations of the crater of Nyiragongo volcano, he returns us to draw the following conclusions:
Regarding the secondary well in the crater of Nyiragongo volcano, it continues to show a very intense activity. This is evidenced by:
Important lava fountains that continue to flow to the well.
Lava flows that continue to spill on the third platform and the two branches formed could meet shortly.
An early release of this flow in the main well was observed.

Regarding the main well of the Nyiragongo volcano, though the lava is concentrated a little lower, it also continues to show a very intense activity with lava fountains observable to the north and east.

Afficher l'image d'origine

Note: Since these two wells continue to be supplied, we believe that the likelihood of clogging near the lava lake in the main well is not feasible currently. In addition, temperature readings in cracks at Kibumba (east side), the summit (South side) and Shaheru indicate a slight decrease in temperature, which means that the activity is still concentrated in the crater and fractures are not yet supplied.

EDM measurements performed around the Nyiragongo crater showed no deformation of the crater between 2 March 2016 and March 11 2016.
Measures extensometric showed a slight expansion of the fracture of the order of 1.1 mm at the Shaheru.
The population of Goma and the surrounding agglomerations thus should not worry because the activity of primary and secondary well is still concentrated in the central crater.

From the above, we make the following recommendations:
– Monitoring daily  this activity by scientists from the OVG .
–  Permanence of Researchers both at OVG than at the top of the volcano to better observations of these activities.
Strengthening measures for all parameters (seismic, Geodesic, geochemical, …) on the South and East sides of the Nyiragongo.

 

Fait à Goma, le 12 Mars 2016

 Source : L’équipe de l’OVG en mission :MUKAMBILWA KIBUYE Pierre KWETU SAMBO Gloire.

Photos : Ovg goma ,  Charles Balagizi ,  Virunga.org.

 

Copahue , Chile :


The level of activity of the volcano is at the level: YELLOW: changes in the behavior of the volcanic activity -Time for an eruption: Weeks / month.
Based on the analysis of information obtained by monitoring equipment and surveillance of the volcano, the Servicio Nacional de Geologia y Mineria (SERNAGEOMIN) -Observatorio Volcanológico de Los Andes del Sur (OVDAS) announces:
-During This period, twenty (23) seismic events, including seven (7) were classified as volcano-tectonic (VT) associated with rock fracturing process were recorded.
Similarly, sixteen (16) fluid dynamics-related events inside the volcano, identified as volcanic earthquakes long period (LP) were recorded.

Regarding seismic activity type VT, the local magnitude (ML) are less or equal to M 2.0 . The highest energy event was located on the northeast side (NE) to 15.4 km of the crater El Agrio, at a depth of 1.2 km.
Regarding LP type of events, they presented reduced displacement values (DRC) below 12.0 cm2, so the local magnitude (ML) was lower than M 2.0 and mainly located around the crater.

 

copahue


During the month, there was a constant tremor signal, primarily associated with the release of particulate matter (gas and ash) from the crater El Agrio, which recorded oscillating DRC values, generally less than 5.4 cm2 , values that are intermediate
/ High for this volcano. The dominant frequencies are concentrated in a bandwidth from 1.0 to 1,4Hz.
Following the data obtained from five (5) GNSS stations, which seek to measure the deformation of the surface of the volcano, it was observed that the horizontal and vertical components showed low swings similar to those recorded during of the year . The largest rate of change of the horizontal components is 0,18cm / month, the greatest change of the vertical component, was 0.23 cm / month.


The situation noted above, clearly reflects an increase in length of about 2 cm from the previous year, reflecting 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 eastnortheast (ENE) of the active crater, have a mean value of 693 ± 128 t / day and a maximum value observed during the first two weeks of 2079 t / day, registered on March 8. The average flow is considered as low level for the volcano.
IP cameras installed near the volcano experienced a constant emission of material from the active crater (El Agrio), accompanied by an incandescence. These emissions have been characterized most of the time, with a gray color, showing the presence of particulate matter.

 

copahue


Satellite images have measured the distance reached by the plume, with values ​​of up to 50 km from the El Agrio crater with directions to the southeast (SE) and the South-East (ESE).
Images published by the Sulfur Dioxide Group (instrument for monitoring the Ozone-friendly http://so2.gsfc.nasa.gov/) and NESDIS (National Environmental Satellite, Data and Information – http: // satepsanone .nesdis.noaa .gov) reported no abnormality of sulfur dioxide (SO2) into the atmosphere in the volcanic complex sector.
The thermal radiation released by the MODVOLC (Moderate Resolution Imaging Spectroradiometer) MODIS on its website (http: //modis.hig p.hawaii.edu/) 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 thermal alerts associated in the volcano area.


According to the monitoring indicators described above, it follows that the activity related to the interaction between a magma body of a small volume to deep levels in the volcanic structure with superficial hydrothermal system continues without reaching an imbalance , maintaining it in what is called a balance « meta-stable ». Such activity may continue for a long period oscillation, without excluding specific increases associated with the activity
Small phreatic explosions and / or low strombolian activity in the crater area can occur.
Therefore, restrict access to the proximal zone within a radius of 1.5 km around the crater El Agrio is recommended. The level of technical alert level remains at Yellow.

Source : Sernageomin

Photos : Tito Páez , Volcanes Andinos.

 

Cascade Range ,  United- States of America :

 CASCADES VOLCANO OBSERVATORY WEEKLY UPDATE
Friday, March 18, 2016 4:30

Current Volcano Alert Level: NORMAL
Current Aviation Color Code: GREEN

Activity Update: All volcanoes in the Cascade Range of Oregon and Washington are at normal background levels of seismicity. These include Mount Baker, Glacier Peak, Mount Rainier, Mount St. Helens, and Mount Adams in Washington State; and Mount Hood, Mount Jefferson, Three Sisters, Newberry, and Crater Lake in Oregon.

Recent observations: Over the past week, earthquakes have been located at Mount Rainier, Mount St. Helens and Mount Hood. At Mount St. Helens, there have been over 100 very small earthquakes, too small to be formally located, all likely occurring between 2 and 4 kilometers depth under the volcano. Such activity is consistent with what we understand to be background levels of seismicity at Mount St. Helens.

st helens

The seismic network at Mount St. Helens continues to detect small magnitude earthquakes. Since March 14, 2016, twelve earthquakes have been formally located and the local network detected at least 100 earthquakes too small to be recorded on enough seismometers to calculate a location. Many of the earthquakes have similar seismic signatures suggesting they are occurring in the same area as the located earthquakes, at an average depth of about 3-4 km. According to the Pacific Northwest Seismic Network, the largest earthquake over a four-day period has been a Magnitude 0.7, an event that would not be felt even if you were standing on the surface above it.

These types of volcano-tectonic earthquakes beneath Mount St. Helens are likely associated with the slow re-pressurization of the magma reservoir, similar to what occurred after the 1980-1986 eruption. This is to be expected and it does not indicate that the volcano is likely to erupt anytime soon.

 

Source : USGS

Photo: Blog scentifiqueamericain.

 

Masaya , Nicaragua :

Masaya volcano’s mouth widens.

18 MARCH 2016. Due to several collapsed landslides, one of the openings located at the inner crater of Santiago in the Masaya volcano has widened, allowing better visualize the strong flow of magma. These landslides, explained the government spokeswoman, Rosario Murillo, have been recorded in the inner walls of the crater.

In addition to this change, the Masaya volcano has not produced greater variation in their activity, Murillo said.

Also during a presentation to the diplomatic corps accredited to the country on March 16, the consultant volcanology of the Nicaraguan Institute of Territorial Studies (INETER) Armando Saballos said that the lava lake contained in intercrater of Masaya, is elliptical 10 meters by 20 meters.

Besides the main mouths, as stated Saballos, « there is another opening in the northeastern part of the Santiago crater which is another very small mouth, where lava is also observed ».
masaya

ANALYSIS AND MONITORING

Saballos said that since INETER constant monitoring is performed Santiago crater, « because it is a volcano located near a large population center. »

However, so far « we have no indication that this activity of the lava lake of Masaya will transcend to something greater, » said Saballos. According to data compiled from research in the colossus, INETER determined that in early December in Santiago crater « was an injection of magma which is obvious because the lava lake have now shifted.

This correlates well with the geochemical data where we see an increase in the emission of sulfur dioxide magmatic « . Although the Masaya has not loud explosions, the Masaya Volcano National Park remains closed to the public.

 Source :   LA PRENSA

Photo : Cesar Perez

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