01/04/2015 . Misti , Popocatepetl , Nevado del Ruiz.
Misti, Perou :
The volcanic activity remains low.
Between 16 and 30 March 2015, earthquakes type VT or fracturing, slightly reduced their occurrence rate from 18 to 16 events / day. No cases of seismic swarm was reported. This seismicity is low energy (<1.8 ML) and was located inside the volcano northwest and southeast of the crater at depths between 1 and 5 km. The largest recorded VT event in this period took place on 23 march at 00:45 HL (5:45 GMT) with a magnitude of 1.8 ml, and was located less than 1.6 kilometers northwest of the crater.
LP-type earthquakes associated with the passage of fluids (gas and steam) in the Misti volcano remains low and their frequency rate remains at six earthquakes LP / day. Furthermore tremor activity also showed a greater variation and maintaining at the previous period. During this period, the curve of energy showed no significant variation and average is the lowest so far this year. The VT and LP activity on Misti volcano is currently very low. It was not detected thermal anomalies and high values for SO2 density on the Misti volcano.
Source : IGP/OVS
Photo : el-gato-lindo.blogspot.fr
Popocatepetl , Mexique :
March 31, 11:00 h (March 31, 17:00 GMT)
In the last 24 hours the surveillance system of Popocatepetl volcano recorded 74 very-low-intensity exhalations along with slight emissions of steam and gas. Also three low-intensity explosions were registered. The largest took place today at 07:40, was accompanied by a slight emission of gas and ash,of less than a kilometer high and was dispersed by winds southwesterly.
Overnight, incandescence was observed over the crater solely when some of the major exhalations.
From dawn up to the time of this report there is a fuzzy but non-stop bluish emission that winds disperse southwesterly .
CENAPRED urges people not to approach the volcano and especially the crater, due to the danger of falling ballistic fragments. Continuous monitoring of the activity is maintained.
The Traffic Alert Volcanic of Popocatepetl is located in Amarillo Phase 2.
Source : Cenapred .
Nevado Del Ruiz, Colombie :
Activity of the Nevado del Ruiz volcano, from March 24 to March 30 .
Activity level Amarillo or (III): changes in the behavior of volcanic activity.
Regarding the monitoring of the activity of the Nevado del Ruiz volcano, the SERVICIO Geologico COLOMBIANO through the OBSERVATORIO VULCANOLÓGICO Y SISMOLÓGICO OF MANIZALES , reports:
The Nevado del Ruiz volcano, in the last week continued to record a volcano-tectonic seismicity associated with the fracturing of the rock inside the volcano. Earthquakes are located mainly in the South West, North East and South East of the Arenas crater, and to a lesser extent in the vicinity of the crater to the north, east and west of it, to depths between 0.5 and 9.1 km. The maximum magnitude recorded during the week was 2.2 ML (local magnitude), corresponding to an earthquake that occurred on March 28 at 11:58 (local time) at a depth of 3.1 km, located west of Arenas crater.
Volcano Nevado del Ruiz view in the Fatima sector (Manizales-Caldas), 28 April 2013
Regarding seismic activity related to fluid dynamics within the volcanic conduit, the Nevado del Ruiz volcano has had several episodes of volcanic tremor, which were characterized by low energy levels. This type of seismic activity is associated with the emission of volcanic ash. The continuous volcanic deformation show some changes.
In the atmosphere, the volcano continues to emit significant amounts of water vapor and gases, including sulfur dioxide (SO2). The gas and steam column reached a maximum altitude of 1500 meters above the summit of the volcano. Most of the time, it was observed white, but sometimes showed gray tones due to the presence of ash. The direction of the dispersion of the column was in line with the wind regime, which remained largely in the south and southwest of the volcanic edifice.
Source : SGC.
Photo : Père Augustin Baima