June 08 , 2016. EN. Masaya , Nevados de Chillan , Kanlaon, Gaua Island.

Home / blog georges Vitton / June 08 , 2016. EN. Masaya , Nevados de Chillan , Kanlaon, Gaua Island.

June 08 , 2016. EN. Masaya , Nevados de Chillan , Kanlaon, Gaua Island.

June 08 , 2016.

 

Masaya , Nicaragua :

Due to the gas pressure and the constant movement of magma under the Masaya volcano internally, there were vertical movements of the volcano floor, said the spokesman of the government Rosario Murillo, citing a study of United States Geological Survey (USGS for its acronym in English).
Dionisio Rodriguez, PhD in geology and scientific researcher, explained that « the deformations indicate fluid movements in the magma chamber up in the crust near the surface, so that it is deformed, forming a bulge. »

masaya

These vertical movements of three centimeters on the floor of the volcano were detected by radars special satellites.
Rodriguez explained that « most deformations can only be detected by indirect methods, geophysical radar and Global Positioning System stations.
Geophysical surveys integrate gravimetry.  »
The two experts of the Institute of Territorial Studies (INET) and Rodriguez agreed that this deformation field is part of the eruptive process of the volcano.
« This is something normal that happens in any volcano that has activity as the Masaya volcano. Since December last year, there was a magma increase with the implementation of the lava lake, which we enjoyed seeing. this is normal, this occurred in the Masaya volcano for centuries, the crater Santiago did nothing out of the ordinary, « said Armando Saballos, volcanologist of Ineter.

masaya

Can not exclude a major eruption.

Rodriguez said that « in this scenario, it can not be excluded a major eruption in the future, we can have it, but it certainly can not predict. »
Meanwhile, Saballos advises that people should be prepared for a possible increase in eruptive activity, but so far, the monitoring information is within normal parameters.
Considering this scenario, the national system of prevention, care and mitigation of disasters (SINAPRED) reported that work in coordination with the INETER continues to update contingency plans that can be updated and prepare population.
« They are prepared independently so there is no danger, » said Guillermo Gonzalez, co-director of SINAPRED.
Meanwhile, Murillo reported that the authorities are seeking to have established all the possible scenarios, tract for access to volcanic activity and existing refuge points .

masayaThe INETER undertake new studies.

To get a better understanding of the situation of the eruption of the volcano Masaya, the Nicaraguan Institute of Territorial Studies (INET) continues to develop studies and receive the support of the United States Geological Survey.
Wilfried Strauch, scientific advisor to the INETER reported that next week will arrive in aid to the director of Nicaragua‘s Emergency Program volcanic John Pallister of the USGS to further study and evaluate the possibility of cooperation between USGS and INETER on monitoring and early warning of eruptions.

  Source : La Prensa.

Photo : Martin Rietze

retrouver toutes les photos de Martin Rietze  ici : http://www.mrietze.com/web13/Masaya16.htm

 

 

Nevados de Chillan , Chile :

Volcanic Activity Report (RAV)

The National Geology and Mining Service (SERNAGEOMIN) described below information obtained through the national network of monitoring teams, processed and analyzed by the Volcanological Observatory of Southern Andes, interpretation center of monitoring data of the Nevados de Chillan volcano:
The level of activity of the volcanic complex is at:

LEVEL YELLOW: changes in the behavior of volcanic activity – likely time for an eruption weeks / months.

 Three hundred eightytwenty-seven (387) seismic events were recorded , forty-eight of which (48) were related to rigid materials fracturing process , called volcano-tectonic earthquakes (VT) with a local maximum magnitude (ML) of 1.9. These events were located 1.4 km EastSoutheast (ESE) of the active crater at a depth of 2 km.
In addition, three hundred and thirty nine (339) earthquakes associated with fluid dynamics inside the volcano have been recorded, called long-period events (LP). The event LP largest was an earthquake of magnitude (ML) of 2.1, with a little reduced displacement value (DRC) of 25,3cm2.

nevados de chillan

The sulfur dioxide emissions (SO2) recorded on Nevados de Chillan  volcanic complex by the equipment DOAS (Differential Optical Absorption Spectrometry), Chillán Station, located 3 km to the North-East ( ENE) of the active crater measurements taken only two days during the second half of the month showed a mean value of 544 ± 17 t / day. Note that due to the pulsatile nature of the data of the eruptive process, they will show great variability and intermittent reception.
However, a decrease was observed in sulfur dioxide emissions compared to previous months.

According to data provided by four (4) GNSS stations that monitor the deformation of the surface of the volcanic complex, some variations are observed, low amplitude in the horizontal and vertical components, which do not exceed 0.25 cm / week and 0 35 cm / month, respectively. In turn, the control lines that cross the complex did not show higher rates to 0.5 cm / month. Further data from two (2) inclinometers installed around the complex show no internal deformation related to the evolution of the volcano and observed for small-scale variations.
The images obtained by the network of cameras in the region showed weak pulsatile surface, mainly characterized by a whitish emission plume associated with the water vapor.
It has not been observed nightglow.

nevados de chillan

The images published by the Group Sulphur dioxide (ozone monitoring instrumenthttp://so2.gsfc.nasa.gov/) and NESDIS (National Environmental Satellite, Data, and Information – IMO Group http: // satepsanone .nesdis.noaa.gov) reported no abnormality in sulfur dioxide (SO2) into the atmosphere of the the volcanic complex sector.

Thermal radiation released by the MODVOLC (Moderate Resolution Imaging Spectroradiometer) MODIS on its website (http://modis.higp.hawaii.edu/) and Mirova (Middle InfraRed Observation of volcanic activity) on its website ( http: / /www.mirovaweb.it/), surveillance systems that indicate important changes in surface temperature, have not reported thermal alerts in the zone associated with volcanic complex.

The monitoring parameters for fifteen days indicate a decrease in activity, suggesting stable trend of the volcanic system, indicating that the interaction between the magma body in surface and the hydrothermal system was lower maybe due to the dynamics of a lower caloric intake and a low volume of the magma body underneath.
In this scenario, it is still possible to see appear new phreatic explosions and / or Freatomagmatic eruptions of currently active craters given pulsatile characteristics indicated in the current activity.
Therefore the level of volcanic alert remains at LEVEL YELLOW.
Considering as a high-risk area the area within 2 km from the active craters, it is recommended to limit access to this zone.

Source : Sernageomin

 

 

Kanlaon , Philippines :

Kanlaon Volcano’s seismic monitoring network recorded three (3) volcanic earthquakes during the past 24 hours. Moderate emission of white steam plumes that rose up to 600 meters and drifted northwest was observed. Ground deformation measurements from continuous GPS data as of 2 June 2016 indicated slight inflation of the Kanlaon edifice since December 2015.

kanlaon

Alert Level 1 status remains in effect over Kanlaon Volcano, which means that it is currently in a state of unrest probably driven by hydrothermal processes that could generate more minor eruptions. The local government units and the public are reminded that entry into the 4-kilometer radius Permanent Danger Zone (PDZ) is strictly prohibited due to the further possibilities of sudden and hazardous steam-driven or minor ash eruptions.

Source : Phivolcs

Photo : Negros travelling

 

 

Gaua Island , Vanuatu :

14°16’0”S 167°30’0”E
Summit 2615ft (797m)
Current Vanuatu Volcano Alert Level: Level 1

The Alert Level for Gaua volcano remains at Level 1.

This means that the volcanic activity remains unrest. The area of risk is around the volcanic crater.
This is a reminder to all visitors do not approach the volcanic crater to avoid volcanic gases impact and any other volcano activity impacts.
All communities, villages, visitors and travel agencies have to seriously consider this information.

The Vanuatu Meteorology and Geo-Hazards Department will continue to closely monitor this volcano activity. More information will be provided when necessary.

 

gaua

The roughly 20-km-diameter Gaua Island, also known as Santa Maria, consists of a basaltic-to-andesitic stratovolcano with an 6 x 9 km wide summit caldera. Small parasitic vents near the caldera rim fed Pleistocene lava flows that reached the coast on several sides of the island; several littoral cones were formed where these lava flows reached the sea. Quiet collapse that formed the roughly 700-m-deep caldera was followed by extensive ash eruptions. Construction of the historically active cone of Mount Garat (Gharat) and other small cinder cones in the SW part of the caldera has left a crescent-shaped caldera lake. The symmetrical, flat-topped Mount Garat cone is topped by three pit craters. The onset of eruptive activity from a vent high on the SE flank in 1962 ended a long period of dormancy.

Source : Geohazard , GVP.

Photo : Eric Chahi

Recommended Posts

Leave a Comment

Nous contacter

Nous ne sommes pas disponibles pour le moment. Mais vous pouvez nous envoyer un email a l'aide du formulaire ci-dessous.

Not readable? Change text. captcha txt

Start typing and press Enter to search