April 07 , 2016. EN. Nevado Del Ruiz , Momotombo, Masaya , Telica , Klyuchevskoy , Langila .
April 07 , 2016.
Nevado Del Ruiz , Colombia :
Weekly bulletin of activity of the volcano Nevado del Ruiz, from March 29 to April 4, 2016
The level of activity continues at:
Activity Levels 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 is associated with fluid dynamics inside volcanic conduits. This fluid activity was characterized by the appearance of long period earthquakes (LP) and short volcanic tremor pulses with important energy levels. Tremor episodes also continued with different energy levels.
Some of these seismic signals were associated with ash emission process, sometimes confirmed by images captured by the cameras installed in the volcano area, by visual assessment of the municipalities of Caldas and Tolima, and officials reports both the Colombian Geological Survey Service (CGT) and the National Natural Park of Nevado (NNNP). These events have been located in the Arenas crater and in the Southeast sector of the volcano. New seismic signals of this type with high levels of energy and emissions of ash in the atmosphere are not excluded, which can be dispersed according existing wind conditions in the region.
Seismic activity related to the fracturing of rocks in the volcanic structure continues to present considerable energy levels and showed an increase both in number and in power, regarding the events of the previous week. Earthquakes are located mainly in the northern volcanic areas, South and South-West of the crater of the volcano Olleta, and to a lesser extent in South and North of Arenas crater. Events depths were between 1.01 and 7.77 kilometers. An increase of seismicity recorded since April 4 and continues at the time of publication of this bulletin, which took place in the southern sector, and to a lesser extent in North distal and southwest sectors been demonstrated. The maximum amplitude of the week matches the recorded earthquake on March 29 at 20:01 (local time), with a magnitude of 3.4 ML (local magnitude), located in the northern sector of the volcano at a depth 3 , 0 km; and which was reported by the NNNP staff.
The volcanic deformation measured from electronic inclinometers, global navigation satellite systems (GNSS) and satellite images to track changes in the tilt, the position and shape of the volcano (respectively), continues to show registered changes.
The volcano continues to emit into the atmosphere large amounts of water vapor and gases, including sulfur dioxide (SO2), which is distinguished as it was 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 3500 meters above the summit of the volcano. This height corresponds to the emission of ash that was held on March 31 at 8:04 (local time) observed from several municipalities in the departments of Caldas and Tolima. The direction of the dispersion of the column was in line with the prevailing wind in the area, which during the week showed a variable direction between the Northwest and the Southwest over the volcano.
From the technical-scientific 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 thereof and amend consequently the level of activity.
Source : SGC.
Photos : LUNWERG EDITORES , enimien-a-pereira.blogspot.fr
Momotombo, Masaya , Telica , Nicaragua :
At 6:37 today, a small explosion of gas and ash was recorded, which amounted to about 200 meters above the crater and spreading to the West.
Since the beginning of this eruptive activity has been recorded on the Momotombo volcano, 407 explosions with ejection of volcanic ash.
Since 1:35 this morning, the Momotombo volcano presents a volcanic tremor that weakened for a few minutes, then increased again.
Seismic amplitude in real time (RSAM) is low to moderate, with values between 40-650 units.
Masaya volcano .
Between 8:13 p.m. yesterday and 0:26 today were recorded six earthquakes of magnitude between M 1.0 and M 2.2 , which were located inside the caldera and near the Masaya volcano, which have the characteristics of have been induced by the activity of the volcano.
Volcanic tremor remains high, showing a seismic amplitude in real time moderate to high , between 400 and 1,100 units.
The lava lake in the crater Santiago maintains its normal movement of magma, with low emission of volcanic gases.
The micro-seismic activity of the Telica remains high, with low to moderate gas emissions.
The seismic amplitude in real time is to low values, less than 70 units.
Tourists and the general public must not approach the volcano’s crater, since the possibilities of new explosions producing gas and volcanic ash, without warning persists.
Source : Ineter
Photo : Norman Angus Godfrey
Klyuchevskoy, Kamchatka :
N 56 ° 3 min E 160 deg 38 min
Activity of the volcano increased. Strong Strombolian activity of the volcano began to observing from 1125 UTC on 03 April (a bright incandescence of the summit crater). A bright thermal anomaly over the volcano began continually registering at satellite images from a dark time on 05 April. Strong gas-steam volcanic activity continues. Ash explosions up to 19,700-26,240 ft (6-8 km) a.s.l. could occur at any time.
A moderate activity of the volcano continues. Ash explosions up to 19,700-26,240 ft (6-8 km) a.s.l. could occur at any time. Ongoing activity could affect international and low-flying aircraft.
NO ASH CLOUD PRODUSED
The eruption of Klyuchevskoy volcano – a view from IVS FED RAS base « Apakhonchich » on October 15, 2013. Strombolian and Vulcanian activity, large lava flows on the south-western volcanic flank and hot avalanches on the south-eastern flank.
Klyuchevskoy (also spelled Kliuchevskoi) is Kamchatka’s highest and most active volcano. Since its origin about 6000 years ago, the beautifully symmetrical, 4835-m-high basaltic stratovolcano has produced frequent moderate-volume explosive and effusive eruptions without major periods of inactivity. It rises above a saddle NE of sharp-peaked Kamen volcano and lies SE of the broad Ushkovsky massif. More than 100 flank eruptions have occurred during the past roughly 3000 years, with most lateral craters and cones occurring along radial fissures between the unconfined NE-to-SE flanks of the conical volcano between 500 m and 3600 m elevation. The morphology of the 700-m-wide summit crater has been frequently modified by historical eruptions, which have been recorded since the late-17th century. Historical eruptions have originated primarily from the summit crater, but have also included numerous major explosive and effusive eruptions from flank craters.
Sources : Kvert , Gvp .
Photo : Yu. Demyanchuk, IVS FEB RAS, KVERT
Langila , New Britian , Papua New Guinea :
Elevation 1330 m
Based on analyses of satellite imagery, the Darwin VAAC reported that during 2-3 April ash plumes from Langila rose to an altitude of 2.1 km (7,000 ft) a.s.l. and drifted 35-65 km N NE, and E.
Langila, one of the most active volcanoes of New Britain, consists of a group of four small overlapping composite basaltic-andesitic cones on the lower eastern flank of the extinct Talawe volcano. Talawe is the highest volcano in the Cape Gloucester area of NW New Britain. A rectangular, 2.5-km-long crater is breached widely to the SE; Langila volcano was constructed NE of the breached crater of Talawe. An extensive lava field reaches the coast on the north and NE sides of Langila. Frequent mild-to-moderate explosive eruptions, sometimes accompanied by lava flows, have been recorded since the 19th century from three active craters at the summit of Langila. The youngest and smallest crater (no. 3 crater) was formed in 1960 and has a diameter of 150 m.
Source: Centre d’avis de cendres volcaniques Darwin (VAAC) , Gvp .
Photo : Wally Johnson, 1970 (Australia Bureau of Mineral Resources).