November 18 , 2016. EN. Guallatiri , San Miguel ( Chaparrastique) , Kerinci , Popocatepetl , Tungurahua .
November 18 , 2016.
Guallatiri , Chile :
Special volcanic activity report (REAV)
Region Arica and Parinacota, 02 November 2016 15:15 (local time).
The National Geological and Mining Service (SERNAGEOMIN) describes the following information obtained by the volcano monitoring equipment, processed and analyzed at the South Andes Volcanological Observatory, Data Interpretation Center of the National Surveillance Network of SERNAGEOMIN:
Wednesday, November 2, 2016 at 02:34 local time (05:34 GMT), the monitoring stations installed near the volcano Guallatiri recorded one (1) earthquake associated with rock fracture (Volcano-Tectonic). The event was located 6 km to the south (S) of the main crater.
The localization obtained was as follows:
TIME OF ORIGIN: 02:34 hl (GMT -3)
LATITUDE: 18 ° 27’58 .20 « South
LONGITUDE: 69 ° 08 ’00 .60 « West
DEPTH: 8,5 km
LOCAL MAGNITUDE: 3.1 (ML)
This seismic event is a part of a seismic swarm (generation of a series of events in a short period of time) that started at 02:18 local time (05:18 GMT). At the time of the publication of this report and over a period of 40 minutes of duration, 12 events of lesser magnitude were recorded.
The level of technical volcanic alert remains at GREEN.
SERNAGEOMIN continues on-line monitoring and will report in a timely manner on changes in volcanic activity in the region.
One of northern Chile’s most active volcanoes, Volcán Guallatiri is a symmetrical ice-clad stratovolcano at the SW end of the Nevados de Quimsachata volcano group. The 6071-m-high Guallatiri lies just west of the border with Bolivia and is capped by a central dacitic dome or lava complex, with the active vent situated at its southern side. Thick lava flows are prominent on the lower northern and western flanks of the andesitic-to-rhyolitic volcano. Minor explosive eruptions have been reported from Guallatiri since the beginning of the 19th century. Intense fumarolic activity with « jet-like » noises continues, and numerous solfataras extend more than 300 m down the west flank.
Source : Sernageomin
Photo : Gerard Finet, Lagrandemigration
San Miguel ( Chaparrastique) El Salvador :
Special report due to fluctuations in the activity of the Chaparrastique volcano.
From 7 November to the time of preparation of this report, the activity of the Chaparrastic volcano remained with slight fluctuations observed through the degassing of the crater.
The average of the fluctuations recorded during the last seven days oscillates between 95 and 173 units RSAM / hours, with an average of 142 units. In the last 24 hours, it fluctuated between 132 and 143 with an average of 138 RSAM units (Figure 1).
Figure 1. Seismic vibration of the volcano which continues to show fluctuations.
These changes in the vibration of the volcano are linked to gas pulses inside the volcano.
Shooting with the camera of the MARN installed on the volcano Pacayal show the presence of gas pulses emanating from the crater, with a predominant South-South-West direction (Figure 2).
Figure 2. emission of gas pulses from the central crater of the volcano on 14 November at 07:30
From September to today, sulfur dioxide (SO2) emissions fluctuated between 71 and 1337 tonnes per day, correlated with increases and decreases in volcano vibrations (Figure 3). These fluctuations are typical of an open volcanic conduit system.
Figure 3. The emission of sulfur dioxide and the vibrations of the volcano continue to vary cyclically.
The MARN continues its improved surveillance of the volcano, maintains close communication with the Directorate General of Civil Protection and local observers.
The ministry invites journalists and individuals not to approach the summit of the volcano, because of the degree of danger that this represents.
The next data update will take place on Monday 21 November 2016. If significant changes occur a special report will be published in due course.
Source : Marn
Kerinci , Indonesia :
Kerinci Volcano Warning State: Waspada
Visual Date 18/11/2016 at 20h34: an emission column with a high ash content rises from 500-600m and is scattered towards the West-North-West.
* RECOMMENDATIONS PVMBG *
– People around the Kerinci volcano and visitors / tourists are not allowed to approach the mouth of the crater within a radius of 3 km around the active crater (community activities are forbidden within the danger radius / KRB III)
– Falling projectiles around the G.Kerinci may occur at any time, with the ash elevation whose wind can alter the migration trajectory.
Source : PVMBG
Photo : cliffbarackman.com
Popocatepetl, Mexico :
November 17 11:15 h (November 17, 17:15 GMT)
In the last 24 hours the seismic records of the surveillance system at Popocatépetl volcano registered 255 low-intensity exhalations along with emissions of steam and gas . Besides 316 minutes of low-aplitude tremor were recorded.
During the night glow was seen over the crater .
At the time of this report there is no visibility to the crater, however, this morning was notuced a continuous emissionof steam and gas .
CENAPRED emphasizes that people SHOULD NOT go near the volcano, especially near the crater, due to the hazard caused by ballistic fragments .
This type of activity is included within the scenarios Volcanic Traffic Light Yellow Phase 2.
Source : Cenapred
Photo : Erik Gomez Tochimani
Tungurahua , Ecuador :
Update of volcano activity
After the special report No. 9 published this year on 4 October, the internal activity of the Tungurahua volcano has reached a low level with almost zero manifestations on its surface except for an activity of intermittent and light fumaroles on the Northeast flank (Fig. 1).
Figure 1. Tungurahua volcano. Activity of minor fumaroles on the northeast flank. (Photo: B Bernard 07/11/2016)
On the basis of monitoring data and direct observations, it is estimated that an reactivation of Tungurahua in the medium term (weeks to several months) is unlikely. However, based on the rapid changes in Tungurahua activity in recent years, it is important to remain vigilant for any change in monitoring parameters. It was noted that volcanic eruptions are unpredictable and that the scenarios raised here may change as a function of volcano activity and analysis of instrumental and visual surveillance data.
SO2 emissions, Seismicity, Deformation:
The seismic activity of the Tungurahua volcano is classified as low and is characterized by a few LP (fluid motion) and VT (rock fracturing) events at the average of one event / day. Moreover, the deformation shows an inflationary trend in the RETU station (closest to the crater of the volcano) with a net variation of 72 urad this week and at a rate of 15 urad / day (Figure 2) Of the days, it has stabilized.
Figure 2. Evolution of seismic activity and deformation at the Retu station for the period from 10/01/2015 to 31/10/2016.
Low SO2 emission values with an average of 300 tonnes / day added to a few valid measurements confirm the low activity presented by the volcano.
Observation conditions were generally favorable. There has been a slight activity of fumaroles in recent weeks. In addition, an overflight was conducted during which maximum temperatures of 51.3 ° C were measured in the volcano crater (Figure 3)
Figure 3: Left, inner edge of the crater seen from the southwest of the volcano. To the right, the thermal image showing in yellow the zones of higher temperatures in the crater. (Photo and image: M. Almeida 17/10/2016.)
The following potential scenarios in the mean term (weeks to months) are taken into account:
1) Low activity is maintained: internal and surface activity remains at low levels such as those recorded to date and therefore an eruption does not occur; This scenario is for the moment most likely.
2) Rapid reactivation: by showing a significant increase in seismic activity (swarm of LP and VT events) this could lead to a scenario of the Vulcanian style. The beginning of this eruptive phase could produce a rapid opening of the conduit with moderate explosions in general (as for example in May 2010, July 2013, February 2014). This scenario could lead to a large eruptive column (up to 10 km above the crater) and pyroclastic flows that could descend the gorges to reach the foot of the volcano. The falls of ash and debris associated with this type of high eruptive column can affect the areas located far from the volcano with different directions depending on the direction of the winds. The ballistic blocks (blocks and volcanic bombs) associated with the explosions could reach a distance of 5 km from the crater.
In this scenario small lava flows could descend through the northwest flank for a distance of less than 4 km. Secondary lahars could be generated due to subsequent rainfall remediation of eruptive materials and could block the Baños-Penipe road, depending on the amount of material accumulated in the streams and the intensity / duration of the rain . This eruptive scenario is unlikely at present on the basis of the results of the instrumental and visual surveillance data.
3) Progressive reactivation: An increase in the volcano’s internal activity could be strombolian in style, which can last from a few weeks to a few months, there may be small to moderate explosions, lava fountains and ash columns less than 6 km above the crater (eg April-May 2011, March 2013, April 2015). The main phenomenon that would affect the population would be ash falls, moderate to strong, located mainly west of the volcano (unless a change in wind direction is observed). Ballistic blocks (blocks and volcanic bombs) and small pyroclastic flows could reach a distance of 2.5 km from the crater. Small secondary lahars could be formed due to rain, remobilizing eruptive material, which could cut the road Baños-Penipe.
These parameters can be modified as a function of changes in volcano activity and analysis of instrumental and visual monitoring data. The IGEPN maintains a constant vigilance in the center Terras (Quito) and the Observatory of the volcano Tungurahua.
Source : IGEPN
Photo : José Luis Espinosa Naranjo