March 24, 2016. EN. Momotombo , Nevado Del Ruiz , Rincón de la Vieja , Mauna Loa .

Home / blog georges Vitton / March 24, 2016. EN. Momotombo , Nevado Del Ruiz , Rincón de la Vieja , Mauna Loa .

March 24, 2016. EN. Momotombo , Nevado Del Ruiz , Rincón de la Vieja , Mauna Loa .

March 24, 2016.

 

Momotombo , Nicaragua :

Momotombo volcano saw this morning, its volcanic tremor climbing, from 100 to 1900 RSAM units, which could again be the sign of an increase in activity, as it was known at the beginning of December 2015, when he made several explosions and ejected incandescent materials for several days, said the coordinator of the communication and citizenship Rosario Murillo.

 

Momotombo

Even if at 9:45 today the volcanic tremor of the volcano has decreased from 100 to 400 units, this possibility remains latent.
« There is an increased pressure under the volcano, which increases the possibility of new explosions and expulsion of incandescent materials » similar to those registered in the last few weeks, she added.

During that time the volcanic tremor of Masaya volcano remains high, but the gas emissions are at low levels. The Telica, meanwhile, recorded his usual seismic activitybut always with possible explosions.
On San Cristobal volcano, only an earthquake of magnitude M 1.4 was recorded.

 

Source : Elnuevodiaro

Photo : AP Photo/Esteban Felix ( 12/2015 )

 

Nevado Del Ruiz , Colombia :

Weekly activity report of the Nevado del Ruiz volcano.

The level of activity continues at:
Activity level Yellow or (III): changes in the behavior of volcanic activity.

Regarding the monitoring of the activity of the Nevado del Ruiz, the SERVICIO Geologico COLOMBIANO reports:

During the last week, the volcanic system continued to show unstable behavior. The recorded seismic activity was mainly associated with fluid dynamics in volcanic conduits, which was characterized by the occurrence of earthquakes long period (LP), short pulses of volcanic tremors and episodes of continuous tremors with different  energy levels.

Some of these signs have been associated with the process of emission of ash , sometimes confirmed by the images captured by the cameras installed in the Volcano area and reports of officials of the Colombian Geological Service and the National Park Of Los Nevados (NNNP) . This seismic activity was localized mainly near the Arenas crater and in the Northwest , South and Southeast areas of the volcano. Do not rule out new episodes of these signals with higher levels of energy and emissions of ash in the atmosphere are likely to occur, which can be dispersed according to the wind conditions prevailing in the region.

nevado del ruiz

Seismic activity related to the fracturing of the rock in the volcanic structure during the week was mainly in seismogenic zones of the Southeast and Northeast and to a lesser extent, scattered in Northern distal , Southwest, East and near the Arenas crater. Their depths were between 0.84 and 7.23 kilometers. The largest seismic event of the week was registered on March 18 at 18:24 (local time) with a magnitude of 1.8 ML (local scale), located in the southeast sector compared to the Arenas crater at a depth of 3.35 km.

The volcanic deformation measured from electronic inclinometers, global navigation satellite systems (GNSS) and satellite images, which record changes in the tilt, the position and shape of the volcano (respectively) during the last assessment period continues to show recorded changes.
The volcano continues to emit into the atmosphere large amounts of steam and water gas, including sulfur dioxide (SO2), as has been estimated by the permanent stations SCANDOAS installed in the Volcano area and satellite imagery.
The column of gas, steam and ash reached a height of 1,800 meters above the summit of the volcano on March 15. The direction of the dispersion of the column was in line with the prevailing wind in the area, which during the week showed a predominant direction towards the southwest compared to the volcano.

nevado del ruiz

Through the scientific-technical and instrumental analysis, it is considered that the volcano Nevado del Ruiz continues to evolve and it is possible that future events may indicate an acceleration of the process, involving greater instability of it requires amend its level of activity. While the instability of the volcano is the same for more than five years, it is essential not to get used to this behavior and be attentive to official information to be published by the Colombian Geological Service.

Source : SGC.

Photo : Sgc,  LUNWERG EDITORES

 

Rincón de la Vieja , Costa Rica :

10.83°N, 85.324°W
Elevation 1916 m

OVSICORI-UNA reported that the seismic station located 1.8 km from Rincón de la Vieja recorded increased activity between late September and early November 2015, which became further evident in February 2016. Field investigations were conducted in February and March to assess this recent activity.

 

rincon de la vieja

Between October 2015 and the first half of March 2016, the seismic network detected 69 events accompanying eruptive events though few of them and any resulting deposits were visually confirmed. Of the 69 events, seismic signals indicated that 28 of them occurred as a series of explosions during 17-18 October 2015, culminating with a major eruption at 0059 on 18 October. During February-15 March both the number of eruptive events and the energy of those events increased significantly; the data suggested that the events were phreatic. The two highest-energy events occurred at 0912 on 9 February and at 1354 on 9 March.

 

rincon de la vieja

During fieldwork on 3 March, volcanologists found sediment deposits from the crater lake in an area about 200 m from the active crater, from phreatic activity and possibly strong westward-blowing winds. They heard three phreatic explosions, at 1204, 1209, and 1318; the third one was the strongest and lasted just over a minute. All three were followed by a strong sulfur dioxide odor. On 8 March volcanologists noted ash deposits, from recent weeks, as far as about 120 m from the crater rim covering an estimated area of 0.02 square kilometers. The temperature of the lake water was 45 degrees Celsius on average and 55 degrees in the convection cell. Gas measurements suggested a magmatic component, with a carbon dioxide to sulfur dioxide ratio of 2. The ratio of water vapor to sulfur dioxide was about 300, higher than the 100-200 ratio detected in previous years; degassing of the lake increased in March. Preliminary analysis of ash ejected during March activity suggested the possibility of a magmatic component. Photos from area residents of explosions during 9-10 March showed ash-and-steam plumes rising as high as 850 m above the crater.

Source : Ovsicori , Gvp.

Photo : agaudi.wordpress.com , nacion.com.

 

Mauna Loa , Hawai :

19°28’30 » N 155°36’29 » W,
Summit Elevation 13681 ft (4170 m)
Current Volcano Alert Level: ADVISORY
Current Aviation Color Code: YELLOW

Activity Summary:
Mauna Loa is not erupting. There have been no significant changes in seismicity recorded beneath Mauna Loa. Seismicity remains elevated above the long-term background level, as shallow earthquakes continue to occur mostly beneath Mauna Loa’s upper Southwest Rift Zone at depths of less than 5 km (3 mi). Global Positioning System (GPS) measurements show continued deformation related to inflation of a magma reservoir beneath the summit and upper Southwest Rift Zone, with inflation recently occurring mainly in the southwestern part of the magma storage complex.

 

mauna loa

Mauna Loa is the largest active volcano on our planet, rising gradually to 4,170 m (13,681 ft) above sea level. Its long submarine flanks descend an additional 5 km (3 mi) below sea level to the ocean floor. The ocean floor directly beneath Mauna Loa is, in turn, depressed by the volcano’s great mass another 8 km (5 mi). This places Mauna Loa’s summit about 17 km (56,000 ft) above its base. The enormous volcano covers half of the Island of Hawaiʻi.

Source : HVO

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