February 12 , 2017. EN. Piton de la Fournaise , Nevado Del Ruiz , Bulusan , Popocatepetl .
February 12 , 2017.
Piton de la Fournaise , La Réunion :
The eruption begun on January 31, 2017 at 7:40 pm local time continues. The volcanic tremor (indicator of surface eruptive intensity) remains at a high intensity level (Figure 1).
Figure 1: Evolution of RSAM (volcanic and volcanic eruption indicator) between January 31st and February 11th (16h local time) on the seismic station of Château Fort, located on the southern flank of the volcano. (© OVPF / IPGP)
Samples were taken Friday morning and will then be sent to metropolitan France for analysis. According to the director of the OVPF Aline Peltier, the results will allow us to know more about the activity of Piton de la Fournaise.
– No seismicity was recorded during the day under the summit of Piton de la Fournaise.
– The inflation of the volcano observed for several days seems to have stopped. This parameter will be confirmed in the next few days.
A cone 30-35 m high (in its maximum height) and 190 m wide was built. A single active mouth is observed at the top of this cone, from which escape regular projections covering its external walls and thus contributing to its growth. The lava level inside the cone is relatively low (about half the height of the cone at 08:50 this morning). Most of the activity is done in lava tunnel, and surface flows are therefore low (estimates between <1 and 2.4 m3 / s according to the satellite data of the HOTVOLC platforms (OPGC – Clermont Ferrand) and MIROVA (University of Turin)).
Only a few small arms are visible at the exit of some tunnels. These observations are consistent with the low flux of SO2.
Source : OVPF, Fournaise Info .
Photo : Luc Perrot photographie
Nevado Del Ruiz , Colombia :
Weekly activity bulletin of the volcano Nevado del Ruiz, from 31 January to 6 February 2017
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 volcano Nevado del Ruiz, the Colombian Geological Survey reports that:
During the week, various monitoring parameters show that the volcano Nevado del Ruiz remains unstable. The seismic activity associated with the fracturing of the volcanic rock beneath the building showed a slight decrease in the number of recorded earthquakes and a slight increase in the seismic energy released compared to the previous week. This seismicity was located mainly in the northern and southwestern areas and, to a lesser extent in the Arenas crater and the northwest and north sections of the volcanic structure. Depths of seismic events ranged from 0.6 to 7.3 km. The maximum magnitude recorded during the week was 2.7 ML (local magnitude), which corresponds to the earthquake recorded on 3 February at 12:24 (local time), 3.2 km deep , located 2.6 km south-east of the Arenas crater.
Seismicity related to fluid dynamics in volcanic ducts has been characterized by the appearance of earthquakes long-period (LP) and very long period (VLP) with different energy levels, pulses of Tremors and multiple earthquakes of fluids. This type of seismicity was mainly located in the Arenas crater and the south-eastern sector of the volcano. Some of these seismic signals have been associated with the emission of gases and ash into the atmosphere, as confirmed by the cameras installed in the volcano region and the reports of the managers of the Los Nevados Natural Park (Pnnn) . The recording of such seismic signals is not excluded, with higher energy levels which may be associated with the emission of gas and ash. It is important to remember that ash emission processes can occur over several days and sometimes several times a 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 in the last few months, inflation and intermittent inflation / deflation impulses, possibly linked to gas and ash emissions.
The volcano continues to emit significant amounts of water vapor and gases, including sulfur dioxide (SO2), as evidenced by the values obtained by the SCANDOAS stations installed in the volcanic analysis area and by the satellite image. In the tracking information provided by the Mirova portal a low-power thermal anomaly (6 MW), was identified on 3 February.
The column of gas, steam and ash from time to time reached a maximum height of 1500 m measured on the top of the volcano on 31 January. The direction of dispersal of the column was mainly northwest, in accordance with the dominant wind regime in the area.
The volcano Nevado del Ruiz continues to activity level Amarillo.
Source : SGC
Photos : Archives
Bulusan , Philippines :
BULUSAN VOLCANO BULLETIN 12 February 2017 8:00 A.M.
Bulusan Volcano’s seismic monitoring network recorded two (2) volcanic earthquakes during the past 24 hours. Steaming activity could not be observed due to thick clouds covering the summit. Sulfur dioxide (SO2) emission was measured at an average of 80 tonnes/day on February 8, 2017. Precise leveling survey results obtained on January 29, 2017 – February 03, 2017 indicated deflationary changes since October 2016. This is consistent with data from continuous GPS measurements from November 2016 that indicated short-term deflation of the edifice. However the edifice remains generally inflated with respect to July 2016 based on continuous GPS data.
Alert Level 1 (abnormal) remains in effect over Bulusan Volcano. This indicates that hydrothermal processes are underway beneath the volcano that may lead to steam-driven or phreatic eruptions. Local government units and the public are reminded that entry into the 4-kilometer radius Permanent Danger Zone (PDZ) is strictly prohibited and that vigilance in the 6-kilometer Extended Danger Zone (EDZ) on the southeastern slopes must be exercised due to the increased possibilities of sudden and hazardous phreatic eruptions.
Source : Phivolcs
Popocatepetl , Mexico :
11 February 11h00 (1700 GMT February 11)
Over the past 24 hours, the monitoring systems of the Popocatepetl volcano have identified 68 low-intensity exhalations accompanied by steam and gas. Two volcano-tectonic earthquakes, one yesterday at 11:39 h and the second today at 07:48 h with preliminary magnitude of M1,9 and M2,1 respectively, are also recorded. In addition, there were 28 minutes of continuous exhalations of very small amplitude.
During the night, a glow on the crater was observed.
At the time of this report the volcano is observed with a light and continuous emission of steam and gas in the direction of the Southwest.
CENAPRED asks not to approach the volcano and in particular the crater.
The volcanic alert Sémaphore of Popocatepetl Volcano is located in Amarillo Phase 2.
Source : Cenapred .
Photo : Luis Garcia