October 07 , 2016.
Colima , Mexico :
Elevation 3850 m
The Unidad Estatal de Protección Civil de Colima reported that on 26 September seismicity at Colima increased, and crater incandescence was observed later that day. On 27 September small landslides originating from a new and growing lava dome traveled 100 m down the S flank. The exclusion zone was increased from 5 to 10 km in the Montegrande canyon; a 5-km exclusion zone was maintained in the other areas.
According to news articles, incandescent landslides traveled down the S and SE flanks during 29 September-1 October. Gas-and-ash plumes rose 4 km and caused ashfall in nearby areas including La Becererra, La Yerbabuena, San Antonio, and El Jabali in the municipality of Comala, Montitlán in the municipality of Cuauhtémoc, and Juan Barragan in Tonila, Jalisco. On 1 October the Colima State government stated that the communities of La Yerbabuena (80 people) and La Becerrera (230 people) were preemptively evacuated, and the exclusion zone was extended to 12 km except on the Jalisco side (maintained at 7.5 km). A news article noted that Juan Barragan was also evacuated.
The Washington VAAC reported that on 29 September gas-and-steam emission possibly containing minor amounts of ash rose to an altitude of 4.9 km (16,000 ft) a.s.l. and drifted NW. On 30 September the webcam showed intense activity and crater incandescence, and gas-and-steam emissions that may have contained ash drifting WNW. An intense thermal anomaly was visible in short-wave infrared satellite images. Later that day an ash plume rose to an altitude of 5.8 km (19,000 ft) a.s.l. and drifted 35 km W. Possible emissions with ash were recorded by the webcam on 1 October; weather clouds obscured views of the crater. An ash plume detected in satellite images drifted almost 40 km S and SW. Later that day the webcam recorded explosions and pyroclastic flows. On 2 October ash plumes rose to altitudes of 6.1-8.2 km (20,000-27,000 ft) a.s.l. and drifted SW and W. Emissions later that day were mostly comprised of gas and steam; seismicity decreased.
A thermal anomaly continued to be detected in satellite images. On 3 October ash plumes rose to altitudes of 5.5-6.4 km (18,000-21,000 ft) a.s.l. and drifted 25-40 km SW and SWW. Ashfall was reported in areas on the S and SW flanks. Based on webcam views ash emissions rose to an estimated altitude of 5.5 km (18,000 ft) a.s.l. and drifted S on 4 October.
Volcán de Colima eruption update. The emission of gas has drammatically decreased with the eruption waning, however, the possibility of a further increase in the short-term remains real. Significant ring-fractures have formed as the central region of the dome has collapsed after a large decrease in the effusion rate.
Source : GVP , CIIV
Photos : Raul Arambula Mendoza , CIIV.
Turrialba , Costa Rica :
Activity report of the Turrialba volcano, October 6, 2016
The 10/06/2016 at 10:54 local time, an eruption on the Turrialba volcano was recorded, the height reached by the column is unknown due to poor visibility of the site.
Duration of Activity: minutes.
Winds blowing towards the northwest.
No ash fall reports, reported no sulfur smell.
Comments: Possible eruption in progress, no visibility and no technical problems.
Activity report of the Turrialba volcano: October 6, 2016 at 17:00
The next day after a relative calm, the eruptive activity resumed at about 10:45 with an increase in seismic tremor signal type that coincided with an emission of ash, which, because of the cloud cover, it was not possible to determine the column height. The wind direction was variable, to the North and Northwest according to the IMN, with ashfall reports in Santa Barbara de Heredia. The field reports also indicate that the ash column is directed to the east.
The eruptive activity since remained intermittent according to the information seen on the seismograms, where it’s possible to see earthquakes long period type (LP), related to movements or vibrations of fluids inside the volcano.
Source : Ovsicori
Photo : Archive RSN
Nevados de Chillan , Chile :
Nevados de Chillan volcanic complex (16 to 30 September).
The level of activity of the volcanic complex is at:
LEVEL YELLOW: changes in the behavior of volcanic activity – likely time for an eruption weeks / months.
It was recorded 877 seismic events, of which 62 have been considered in relation to rock fracturing process, called volcano-tectonic, with a maximum magnitude of M 2.5, associated with an event localized at 1.6 km North Northeast of the active crater at a depth of 2.7 km. Also, it was recorded 815 events related to fluid dynamics within the volcanic edifice. The event LP of largest magnitude was recorded on 27 September at 2:59 (local time) with a magnitude of M2.6 and a reduced displacement value of 93.7 cm2
According to data obtained from five (5) GNSS stations and two inclinometers (2) monitoring the deformation of the volcanic complex, low amplitude variations in the horizontal and vertical components were observed which did not exceed 0.12 cm / month. The GNSS supervisory lines crossing the volcano, do not strain rate greater than 0.25 cm / month. On the other hand, the inclinometer data show no tendency to internal deformation caused by volcanic activity, the observed variations have only a low amplitude.
The sulfur dioxide emission (S02) recorded on the Nevados de Chillan volcanic complex by the DOAS team , station Chillian ( by Differential Optical Absorption Spectrometry ), located 3 km East–Northeast (ENE) of the active crater, had an average value of 95 ± 35 t / day. The average flow is considered low for this volcano.
No abnormalities were reported in sulfur dioxide (S02) in the atmosphere in the volcano area, according to data obtained by the IMO and NESDIS group.
No thermal warning have been reported in the area associated with the volcano according to data released by the Modvolc.
Since January 2016, occurred an alternation between periods of intense surface activity and periods of no activity. The last phase of activity took place between 01 and 10 September 2016, recording a total of 37 explosions, with increasing energy. Since the activity decreased in intensity in recent days, but it persists with an energy level that does not rule out explosive new phase from the active craters.
For this is maintained the level of yellow alert and is considered as a high risk zone the area within a radius of 3 km around the active crater.
Source : Sernageomin
Chaparrastique ( San Miguel ) , El Salvador .
The activity of the Chaparrastique volcano : downward trend.
According to the monitoring conducted in the last days, the activity of the volcano Chaparrastique declined. However, it continues to emit pulses of sulphurous gas mixed with water vapor. Over the last 24 hours, the seismic vibrations fluctuated between 88 and 112 units RSAM / hour on average, with an average of 64 units. The balance of the last seven days indicates a fluctuation between 81 and 135 RSAM units, with an average of 109 units (Figure 1).
Figure 1. Behaviour of seismic tremor recorded in the period from August to October 2016, by the station on the northern flank of the volcano. Note the small fluctuations of the downtrend vibration of the last days.
Upon further inspection of the crater on Friday, September 30, pulses were observed, with a smell of sulfur, usual for this volcano with its open channel (Figure 2). No noises were levied, nor any other abnormal activity.
Figure 2. Pulse of sulfur gas that characterize the current state of the volcano.
Thermal monitoring conducted in IR present in the north wall of the crater a maximum temperature of 71.5 ° C. The data examined are within normal limits (Figure 3).
Figure 3. Image visual and its thermal equivalent with a maximum temperature of 71.5 ° C inside the crater.
During the period between September and October 2 of this year, sulfur dioxide gas emitted by the San Miguel volcano fluctuated between 71 and 1 035 t / d, with a slight downward trend (Figure 4) . These values are considered important and typical of an open system of volcanic conduit.
Figure 4. Behavior of sulfur dioxide emissions on the volcano.
In the last 24 hours, 12.2 mm of rain were recorded at the top of the volcano. Protection infrastructure are in good condition and there is no landslide report.
Changes often present on the volcano Chaparrastique are associated with variations in the internal pressure due to fluid movement (magma, gas, steam).
MARN continues its enhanced surveillance of the volcano, maintains close communication with the General Directorate of Civil Protection and local observers.
The Ministry invites journalists and individuals do not approach the top of the volcano, because of the degree of danger that this represents.
Given the decrease in activity of the volcano, according to the protocol, this will be the last special report. If significant changes occur prior report will be issued.
Source : Marn.