February 24, 2016. EN. Etna , Colima , Ubinas , Bulusan.
February 24, 2016.
Etna, Sicilia :
ETNA UPDATE, 23 FEBRUARY 2016
During the month of January 2016, Etna’s eruptive activity has maintained rather low levels. Early that month, a few weak ash emissions occurred from the 25 November 2015 vent located high on the eastern flank of the New Southeast Crater (NSEC) cone; similar phenomena were repeated during the last week of January and once more on the morning of 6 February. During the same time interval, degassing from the Northeast Crater (NEC) were sometimes accompanied by the emission of minor traces of ash.
A field survey was carried out in Etna’s summit area by INGV-Osservatorio Etneo (INGV-OE) staff on 19 February. During the visit, no ash emissions occurred from the summit craters, but the NEC was the site of intense degassing from its open conduit; due to strong wind it was not possible to hear if there was any acoustic activity coming from the crater, which typically produces loud bangs and rumblings. At the other summit craters, degassing was limited to extensive fumarolic areas along the crater rims. The eruptive products of december 2015, which fill the single huge depression constituted by the Voragine and Bocca Nuova, were covered with snow except in the areas where vapors were emitted from fissures formed by compaction of the deposit.
At 03:22 UTC (=local time -1) on 23 February 2016, the video and thermal cameras of the INGV-OE recorded an explosive event at the NEC, which ejected incandescent pyroclastics to several tens of meters above the crater rim (see image at top left, recorded by the high-definition visual camera at Monte Cagliato, on the east flank of Etna – click on image for larger version) and produced a dark ash plume that was blown northeastward by strong wind. The images at center left (click on image for larger version) were recorded by the high-sensitivity camera on the Montagnola (EMOH, on the upper south flank of Etna) and also show a few lightning flashes in the ash cloud.
The images recorded by the thermal surveillance camera at Monte Cagliato (EMCT, see images at bottom left – click on image for larger version) show a conspicuous anomaly generated by the explosion, which was followed by minor ash emissions that gradually diminished; as of the late morning of 23 February, intermittent and weak ash emissions are continuing from the NEC.
Source : INGV .
Photos : INGV, Giuseppe Famiani , Turi Caggegi.
Colima, Mexico :
Confirmed destruction of Colima volcano’s dome .
23 FEBRUARY 2016. The volcanic dome broke into three parts and gave a lot of ash. Jalisco Civil Protection confirmed the destruction of a new dome on the top section of the volcanic pipe, 25 meters in diameter and 12 in height, in the Colima Volcano.
In a statement today, they said that in order to monitor and analyze the conditions of the volcano, personnel from the scientific research and operational area conducted overflights.
They said personnel from the State Unit of Civil Protection and Fire Jalisco (UEPCBJ) made two flybys aboard the helicopter tactical air squadron government of Jalisco. They also said that the dome is broken into three parts and gave a lot of ash.
They noted that the development of this new dome indicates the start of a new effusive process. The staff noted that continued exhalations from 1 July 2015, which reached up to two thousand 500 meters high, left lots of ash and volcanic material on the upper slopes.
Both ash and volcanic material in general represent an imminent danger of forming mudflows and rock in the upcoming seasonal rains or in case of an earthquake. Such material will be channeled through the main canyons, though they have already accumulated abundant material.
They stressed that the issue of high-rise exhalations have not represented danger to the population or to activities in the area carried out outside the perimeter of high risk, established on the map of volcanic hazards. Currently the Colima Volcano crater has a diameter of 300 meters and 120 meters deep.
It was stressed that the UEPCB continue training of the population in the surrounding communities, as well as surveillance and monitoring of volcanic activity 24 hours round. The exclusion zone of 7.5 kilometers remains around the crater, and people have been uged not to camp in the canyons where the giant fire drains.
Source : El Universal
Photos : Carlos Lopez/ volcan nevado de colima , elmetropolitanodigital.com.
Ubinas , Peru :
The level of seismicity LP (long period) associated with fluid movements, experienced a slight decrease in the number of events during this period, showing an average of 112 LP / day (last week 193 LPs / day). In addition, the energy levels are maintained to 1.4 MJ / day considered low.
Regarding hybrid events (activity associated with the rise of the magma), they are rare and at low levels, both in number and in the seismic energy that they generate.
Events fracture type (VT) have the same values as observed in the previous week. During this period, 91 VT / day were observed and the energy levels remained low. However, we can deduce that the internal pressure under the volcano continues.
During the past two weeks, it was recorded small failures in the spasmodic tremor, also associated with fluids. While remaining at low levels, this seismicity indicates the hydrothermal system disturbances. Therefore, it is necessary to further analyze these events.
From a total of 67 events of fractures, mainly distributed around the caldera of the volcano Ubinas, the activity of these earthquakes was concentrated from 1 to 3 km depth beneath the surface of the crater. In addition, these earthquakes have an alignment axis Northwest / Southeast. The maximum size reached by this seismicity corresponds to a magnitude of M 2.9 ML that was generated by the event VT on January 17th at 5:17:01 UTC.
Thermal anomalies: The Mirova system (monitoring of hot spots on the surface of the crater – www.mirovaweb.it) did not detect thermal anomaly.
SO2 anomalies: The satellite system (monitoring the density of the gas SO 2 : http://so2.gsfc.nasa.gov/ ) « EOS Aura » GSDM–NASA did not detect any major anomalies in the density values of the SO2 gas during this period.Cloud cover prevented views of the volcano Ubinas to assess the emission of fumaroles and / or gas. However, during some episodes with a clear view, low vapor emissions, culminating at 200 meters above the base of the crater, were noted.
Rainfall in the area near the volcano are continuous, rain and snow fell on Ubinas and its surroundings.
Source : IGP
Photos : IGP , Latintimes .
Bulusan, Philippines .
BULUSAN VOLCANO BULLETIN 24 February 2016 8:00 A.M.
Bulusan Volcano’s seismic monitoring network recorded eight (8) volcanic earthquakes during the past 24 hours. Weak emission of white steam plumes that crept downslope towards southwest was observed. Precise leveling survey results from December 2-7, 2015 indicated slight inflationary changes of the volcano’s edifice relative to September 2015, consistent with ground deformation measurements from continuous GPS data since August 2015.
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 eruptions. The local government units and the public are reminded that entry to the 4-kilometer radius Permanent Danger Zone (PDZ) is strictly prohibited due to the possibility of sudden and hazardous steam-driven or phreatic eruptions. Civil aviation authorities must also advise pilots to avoid flying close to the volcano’s summit as ash from any sudden phreatic eruption can be hazardous to aircraft.
Source : Phivolcs
Photo : Wikipédia .