March 23 , 2017. EN. Colima , Nevado Del Ruiz , Reventador , Manam .
March 23 , 2017.
Colima , Mexico :
19,514 ° N, 103,62 ° W
Summit : 3850 m
Based on Centro Universitario de Estudios e Investigaciones de Vulcanologia – Universidad de Colima observations, the Unidad Estatal de Protección Civil de Colima reported that during 10-16 March there were three low-intensity explosions at Colima. A slight decrease of sulfur dioxide was detected. During an overflight scientists observed gas emissions from small explosion craters on the floor of the main crater; there was no evidence of a new lava dome. The report noted that the public should not enter the 6-km-radius exclusion zone..
Source: Unité de protection civile État Colima, GVP.
Photo : Hernando Rivera .
Nevado Del Ruiz , Colombia :
Weekly activity bulletin of the volcano Nevado del Ruiz, from March 14 to March 20, 2017
The level of activity continues: at the level of activity yellow or (III) : changes in the behavior of volcanic activity.
As regards the monitoring of the activity of the Nevado del Ruiz volcano, the Colombian Geological Survey reports that:
Over the past week, the various monitoring parameters show that the Nevado del Ruiz volcano continues to show unstable behavior.
Seismic activity related to the fracturing of volcanic rock under the volcano showed a slight decrease in the number of earthquakes and seismic energy released compared to the previous week. This seismicity is located mainly in the North-East, South-West, North, and to a lesser extent in the Arenas crater. The depths of the earthquakes were between 1.2 and 9.7 km. The maximum magnitude recorded during the week was 1.1 ML (local magnitude) for the earthquake of 19 March at 17:03 (local time), located 4.2 km northeast of the Arenas crater, at 2 , 9 km deep.
With regard to seismicity related to the dynamics of fluids in the ducts of the volcanic structure, a slight increase in the number of earthquakes compared to the previous week occurred. This type of activity is characterized by the appearance of earthquakes with variable levels of energy, long period (LP) and very long period (VLP), continuous low energy tremor episodes, pulses of tremor and multiple seismic shakes of fluids. The earthquakes were mainly found in the Arenas crater. Some of these seismic signals have been associated with the emission of gases and ash into the atmosphere, as confirmed by the images captured by the cameras installed in the volcano region and the reports of officials of the Geological Survey of Colombia Who were at work on the ground. Recording of such seismic signals with higher energy levels is not ruled out, which may be associated with emissions of gas and ash. It is important to remember that the ash emission processes can occur for several days and sometimes several times during the day, without involving an individual report for each episode.
Volcanic deformation, measured from electronic inclinometers, Global Navigation Satellite Systems (GNSS) and satellite images to determine changes in tilt, position and shape of the volcano continues to record during in recent months a deflationary process and intermittent inflation / deflationary impulses, possibly linked to emissions of ash and gas.
The volcano continues to emit large amounts of water vapor and gases, including sulfur dioxide (SO2), as shown by the values obtained by the SCANDOAS stations installed in the volcanic analysis zone and satellite images. In the tracking information provided by the Mirova and SAGIR (NASA) portals thermal anomalies were identified on 18 and 20 March.
The columns of gas, steam and ash from time to time reached a maximum height of 1100 m measured on the top of the volcano on 20 March. The direction of dispersal of the column was in line with the direction of the wind in the area, which predominated during the week to the northwest of the volcano.
The volcano Nevado del Ruiz continues to activity level Amarillo.
Source : Ingeominas
Photos : C Rios , Ingeominas .
Reventador , Ecuador :
Activity Bulletin of Wednesday, March 22, 2017
SUMMARY OF ACTIVITY of the Volcano:
The volcano maintains its strong activity. No observation was possible due to the cloudiness of the area.
TECHNICAL APPENDIX AND OBSERVATIONS
From 11:00 (TL) yesterday until 11:00 (TL) today, three episodes of harmonic tremor (TRA), 2 episodes of tremor emission (ERT), 18 events long period (LP) and 35 explosions (EXP )were recorded.
Observations, emissions and ash:
Poor weather conditions do not allow observation of the surface activity of the volcano.
Rains and lahars:
Rainfall in the area that did not generate lahars is recorded
Source : IGEPN
Photo : J L Espinosa Naranjo.
Manam , Papua New Guinea :
Elevation 1807 m
Based on analyses of satellite imagery and model data, the Darwin VAAC reported that on 21 March weak ash emissions from Manam rose to an altitude of 2.4 km (8,000 ft) a.s.l. and drifted NE and E.
The 10-km-wide island of Manam, lying 13 km off the northern coast of mainland Papua New Guinea, is one of the country’s most active volcanoes. Four large radial valleys extend from the unvegetated summit of the conical 1807-m-high basaltic-andesitic stratovolcano to its lower flanks.
These « avalanche valleys » channel lava flows and pyroclastic avalanches that have sometimes reached the coast. Five small satellitic centers are located near the island’s shoreline on the northern, southern, and western sides. Two summit craters are present; both are active, although most historical eruptions have originated from the southern crater, concentrating eruptive products during much of the past century into the SE valley. Frequent historical eruptions, typically of mild-to-moderate scale, have been recorded since 1616. Occasional larger eruptions have produced pyroclastic flows and lava flows that reached flat-lying coastal areas and entered the sea, sometimes impacting populated areas.
Source: Centre consultatif sur les cendres volcaniques de Darwin (VAAC), GVP.
Photo : P J Tate .