October 10 , 2016. EN. Turrialba , Popocatepetl , Fuego , Tungurahua .
October 10 , 2016.
Turrialba , Costa Rica :
Activity report of the Turrialba volcano
October 9, 2016, Update 9:00
Today in the morning was observed on the Web camera of the OVSICORI-A, located on top of the Irazu volcano, an emission column on the Turrialba volcano, emissions associated with steam, gases and ash to a height of less than 500 meters and dispersing in Northwest direction according to the wind direction indicated by the IMN weather station on the volcano, indicating a west–northwest direction and a speed of 20 km / h.
The amplitudes of the observed seismograms with the seismic station on the Turrialba since 5:00 last night indicate variations of amplitudes, the highest of which are associated with increases in ash emissions. The ash and gases must affect areas near the volcano as Raicero Finca Central, Silvia Villa, Finca San Bosco more directly. One report of ash falls has come from Heredia in the morning today.
Activity report of the Turrialba volcano
October 9, 2016 Update 17 hours
In the last 24 hours, the Turrialba volcano ash emission has remained fairly constant. She generates phases of seismic signals of varying intensity with weak pulses. The tremor has decreased over a period of about 1 hour in the afternoon, but at the time of the report, it is again similar to the amplitude level of the morning.
Since 16 hours is visible from the Irazu, an emission column exceeding 500 m above the volcano (3800m heigh). The scattering of ashes is mainly towards the northwest. Ash falls were reported in the east and north of the Central Valley (Coronado, North Moravia, Sabana, Pavas, San Isidro, Heredia, Alajuela Naranjo).
Source : Ovsicori .
Popocatepetl , Mexico :
October 09 11:00 h (October 09, 16:00 GMT)
In the last 24 hours the seismic records of the surveillance system at Popocatépetl volcano registered 147 low-intensity exhalations with steam and gas emission and slight amounts of ash and two explosion yesterday at 13:27 and 15:07 h being dispersed to the northwest. Due to intense cloudiness in the area, it was not possible to observe the volcano continuously. In addition to recorded 297 minutes of low-amplitude tremor.
During the night was observed slight glow over the crater and a continuous emission of steam and gas .
At the time of this there is no visibility to the crater, however, this morning the continuous emission of water vapor and blueish gases was observed being dispersed to the southwest .
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 : Fabian GR
Fuego , Guatemala :
Activity type : vulcanian
Morphology: composite Stratovolcano
Geographical location: 14 ° 28’54˝ N Latitude ; 90 52’54˝ W Longitude .
Conditions: Partly cloudy
Wind: Northeast 4 kmh
Rainfall: 48.6 mm.
Continuing moderate white fumaroles, at a height of 4200 meters (13,779 feet) which spread to the West and South West of the volcano. 16 explosions, 9 low, 5 moderate and one high were reported, emitting a gray column to a height of about 4200-4800 meters (13.779 to 15.748 feet) dispersing towards the West and South West of the volcanic complex, over a distance of 12 km. Some of them were accompanied by rumbling low to moderate, generating weak shock waves. Incandescent pulse at a height of 100 to 200 meters above the crater generated avalanches low to moderate. ashfall reports are originated from: Sangre de Cristo, San Pedro Yepocapa, Hagia Sophia, Morelia, Panimaché I and II.
Source : Insivumeh
Photo : David Rojas
Tungurahua , Ecuador :
Evaluation of the activity of the volcano and analyzes of the possibility of reactivation in the short and medium term (next few days to weeks)
As mentioned in the Special Reports No. 7 and No. 8, on 12 September 2016, there was an obvious increase in the number of earthquakes LP type, and the appearance of small episodes of tremor on 16. On September 18, a swarm of 24 LP between 4:08 and 4:24 (local time) was observed. In addition, on September 24 at 14:00 (local time) an increase in internal seismic activity of the volcano with a net increase in the number of earthquakes and episodes of LP type earthquakes, in areas near the crater was registered. However, unlike what happened in previous occasions, the increase of seismicity has not led to an volcanic activity .
On October 1, an episode of tremor that lasted about an hour were recorded. The number of earthquakes LP and VT type remained on the basic level and was therefore considered that internal activity is at a moderate level with a downward trend.
Based on the recent changes in seismic activity of the volcano, it is estimated that a reactivation of the Tungurahua in the short and medium (days to weeks) term is possible and are considered possible eruptive scenarios:
1) rapid recovery vulcanian style, with a large eruption column and pyroclastic flows, corresponding to the most likely scenario.
2) a gradual recovery, Strombolian style with moderate explosions and ash falls mainly.
Figure 1: Episode of tremor registered , the closest to the crater of Tungurahua, by the seismic station BRTU. The top graph is the spectrogram episode of the tremor, and the bottom graph shows the waveform. The red arrow indicates the arrival of a seismic event that occurred in Peru.
No change in the last days to the maximum daily flow of SO2, nor to the number of valid measures are observed. Both indicators are at the basic level and could indicate that the conduit is closed after the eruption of February-March 2016.
Figure 2: SO2 emission. the daily average measured by the DOAS network Tungurahua is presented.
In recent days, the visual observation conditions were variable. When the volcano remained clear, there was slight fumaroles on the crater rim (Figure 3).
Figure 3: Volcano partially discovered, October 1st, a small fumarole activity was observed in the crater (Photo: S. M. Aguaiza OVT / IG / EPN).
The low outgassing may indicate a conduit blockage that prevents the passage to the outside of magmatic gases. Taking into account the fact that seismic activity remains above the basic level, it is considered that in a short or medium term an reactivation (next days to weeks), is possible.
It is important to note that volcanic eruptions are unpredictable and that the volcano may also return to baseline levels without any eruption occurs.
These settings can be changed according to changes in activity of the volcano and the analysis of instrumental and visual monitoring data. The IGEPN maintains constant vigilance in the Terras center (Quito) and the Observatory of the Tungurahua volcano.
Source : IGEPN
Photos : José Luis Espinosa Naranjo , IGEPN.