October 25 , 2016. EN. Cleveland , Turrialba, Etna , Ilamatepec ( Santa-Ana).
October 25 , 2016.
Cleveland , Alaska :
Current Volcano Alert Level: WATCH
Previous Volcano Alert Level: ADVISORY
Current Aviation Color Code: ORANGE
Previous Aviation Color Code: YELLOW
Issued: Monday, October 24, 2016, 2:19 PM AKDT
Source: Alaska Volcano Observatory
Location: N 52 deg 49 min W 169 deg 56 min
Elevation: 5676 ft (1730 m)
Volcanic Activity Summary:
AVO detected an explosion at Cleveland Volcano in both infrasound (air pressure) and seismic data today (10/24/2016) at 13:10 AKDT (21:10 UTC). Residents in Nikolski 45 miles (75 km) from Cleveland reported hearing the explosion. Cloudy weather obscures the volcano in satellite images from 13:30 AKDT (21:30 UTC), however no evidence of an eruption cloud is detected above the weather cloud deck height of 28,000 ft. The summit is currently obscured by cloudy weather in web camera images. Previous Cleveland explosions have typically produced ash emissions.
AVO is raising the color code/alert level of Cleveland Volcano from YELLOW/ADVISORY to ORANGE/WATCH.
Source : Avo
Photo : Werner, Cindy
Turrialba , Costa Rica :
Activity bulletin of the Turrialba volcano. October 24, 2016, 7:35.
As seen on registering of the seismograph of the station VTCG , bands of tremor of low amplitude are observed for a few hours of the night and in the morning, which may have been accompanied by passive ash emissions. During yesterday , ash falls were reported in various parts of the Central Valley, according AERMOD dispersion modeling of the Atmospheric Chemistry Laboratory (LAQAT-A) of the School of Chemistry, as well as by meteorological values (temperature, solar radiation, speed and wind direction, relative humidity, etc.), reported by the National meteorological Institute (IMN) and topography of Costa Rica.It is estimated that the scattering of ashes (up to 50 km around the volcano) and the gases emitted by the volcano Turrialba, from 3:00 to 6:00 (local time), had a direction towards the South-West and the emissions would affect villages such as Cartago, Paraiso, Cot, Tierra Blanca, Llano Grande, Chicua, San Rafael de Oreamuno, Pacayas, Cachi, Orosi, Cervantes, Capellades, Raicero, Villa Central, Tajo, among other places nearby . So we expect to receive reports of ash fall today.
Activity report of the Turrialba volcano: October 24, 2016, 17:00.
In the last 24 hours, the activity of the Turrialba volcano remained low with sporadic ash emissions until midnight. Emissions highly diluted of ashes were observed between 7 and 9:30 and from that time , ash particles were observed sporadically in the gas plume.
The height of the emission is 500 m above the volcano (4300 m above sea level). The scattering of ashes was made to the South-West overnight and west during the day. Ash falls were reported in San Jose, Tibas, Guadalupe, Curridabat, Tres Ríos, Desamparados, Escazú, Granadilla, Ipís.
Source : OVSICORI
Etna , Sicily :
« Belvedere » revisited:
Five years passed between these photographs. The first was taken after the first 16 paroxysms in the year 2011 at a vent that we just started calling, informally, the « New Southeast Crater » (NSEC).
The cone of this new crater was still considerably lower than the first cone of the Southeast Crater, formed between the 1980s and 2007 (Old SEC). 700 m southeast of the NSEC was one of the most significant monitoring stations of the INGV-Osservatorio Etneo, called « Belvedere » (beautiful view), equipped with seismic instruments (« EBEL »), GPS, a radiometer (to measure heat emission) and various other instruments. The NSEC continued its exceptional growth, and February 2013, lava flows from this crater swallowed the whole set of monitoring instruments at « Belvedere ». I last visited this place in mid-June 2014, and finally returned on 24 October 2016, when the second photo was taken.
Source : Dr Boris Behncke.
Ilamatepec ( Santa Ana), El Salvador :
San Salvador, 17 October 2016
Volcanologists from the Department of Environment and Natural Resources (MARN) conducted an audit of the internal conditions of the Ilamatepec volcano, located between Santa Ana and Sonsonate, with for the first time, the use of a drone for photos and videos from inside the cone.
It took three flights, about 18 minutes each, in unfavorable wind conditions to save the state of erosion of the crater walls , the level and the conditions of the inner lagoon.
According to Eduardo Gutierrez, volcanologist of the MARN, the data obtained with the drone will be used as the basis for future comparisons, to determine changes in the structure of the Ilamatepec. « If landslides occur in the future, we have the photographic and video basis for determining the amount of material fell from internal flanks of the volcano and their causes, » said the expert.
In addition, a visit was carried out in the crater to determine the presence of sulfur in the air, which was followed by a measurement , with the infrared camera of the water temperature.
Inspections on the Ilamatepec, or Santa Ana, take place every two months in a normal state. If monitoring parameter changes are observed, the frequency can be weekly.
With a height of 2,381 meters above sea level, the Ilamatepec, or Santa Ana, is the highest volcano in the country. Its top, with a diameter of 1.5 km, consists of a group of three craters. The formation of the Ilamatepec is stratovolcano type, composed of different layers of eruptive material accumulation.
The volcano is a tourist attraction for foreigners because its crater lagoon hosts an acid with water and sulfated chloride, which formed after the eruption of 1904.
On 1 October 2005, the last blast of the Ilamatepec was recorded. The characteristics of the deposits have been defined as a phreatic eruption which expelled ballistic projections about 10 kilometers and a thick column of gas. An estimated 1.5 million cubic meters of ash were ejected.
Santa Ana, El Salvador’s highest volcano, is a massive, 2381-m-high, dominantly andesitic-to-trachyandesitic stratovolcano that rises immediately west of Coatepeque caldera.
Collapse of Santa Ana (also known as Ilamatepec) during the late Pleistocene produced a voluminous debris avalanche that swept into the Pacific Ocean, forming the Acajutla Peninsula. Reconstruction of the volcano subsequently filled most of the collapse scarp. The broad summit of the volcano is cut by several crescentic craters, and a series of parasitic vents and cones have formed along a 20-km-long fissure system that extends from near the town of Chalchuapa NNW of the volcano to the San Marcelino and Cerro la Olla cinder cones on the SE flank. Historical activity, largely consisting of small-to-moderate explosive eruptions from both summit and flank vents, has been documented since the 16th century. The San Marcelino cinder cone on the SE flank produced a lava flow in 1722 that traveled 13 km to the east.
Source : Marn, GVP.
Photos : Marn , Mike Carr, (1982)