April 19 , 2016. EN. Popocatepetl , Bromo , Villarica , Cleveland .
April 19 , 2016.
Popocatepetl , Mexico :
Big paroxysmal eruption of Popocatepetl.
April 17th 11:00 (16:00 GMT April 17)
In the last 24 hours, through the Popocatepetl volcano monitoring system, were identified 10 exhalations of low intensity, the emissions of which does not produce significant changes in the plume of steam and gas, heading east, which was observed throughout the period covered by this report.
At the time of this report, there is always a good view, showing a low emission of steam and gas.
April 18 3:40 pm (8:40 GMT on April 18)
At 2:32, the Popocatepetl volcano monitoring system began recording an increase in activity, accompanied by continued emissions of incandescent fragments that have reached about 1.6 km altitude, mainly on the Northeast side. The ash plume reached a height of about 3 km above the crater, moving toward the east–northeast.
April 18 5:00 pm (1000 GMT April 18)
At the time of this report there is a decrease in overall activity of Popocatepetl. The emission of incandescent fragments decreased, while the height of the column of ash fell on average 1 km above the crater, moving toward the east–northeast.
It was reported falls of ash in San Pedro Benito Juarez, San Nicolas de los Ranchos, Tianguismanalco, San Martin Texmelucan and Huejotzingo.
April 18 6:00 pm (1100 GMT April 18)
After intense activity recorded from 2:32, at the time of this report, the volcano has maintained a steady decline in its activity. At the moment, a moderate emission of gas with a small amount of ash to the east–northeast is observed.
Semaphore volcanic alert of Popocatepetl volcano is located in Amarillo Phase 2.
Mexico’s Popocatepetl volcano has seen a dramatic overnight explosion that sent ash blowing over the major city of Puebla directly to the east, forcing closure of the city’s airport.
Officials there are urging to people to wear masks to avoid inhaling the fine grit that has covered houses and cars. It can cause respiratory problems and damage car and plane engines.
Mexico’s national disaster prevention agency reports that the eruption began around 2:30 a.m. (3:30 EDT; 0730 GMT) Monday, hurling glowing rock as far as a mile (1.5 kilometer from the crater. Ash rose nearly two miles (3 kilometers) above the crater.
About 25 million people live within 62 miles (100 kilometers) from the crater of the 17,797-foot (5,426-meter) stratovolcano. It’s been periodically erupting since 1994.
Source : Cenapred , newsok.com.
Photos : Volcan Popocatepetl FDB , periodicocorreo.com.mx
Bromo , Indonésia :
Our friend Oystein Lund Andersen is on site to give us news of Mount Bromo. I quote:
Activity of the Volcano
The ongoing eruptive activity that started in December 2015, had a short period of rest between the end of February until the end of March. During this period the activity was dominated by degassing but no ash-venting/eruptions. The Indonesian Volcanology Survey (PVMBG) noted a increase in seismic activity in the first week of April, that was followed by new eruptive activity, similar to the activity during December-February.
The Indonesian Volcanology Survey (PVMBG) have officially stated that people are not allowed to venture to the crater area of the volcano after the volcano started showing signs of increased activity, however this restriction zone is not implemented, as there are no officials guarding the access to the crater area, and tens of people were observed standing on the crater rim on the 16th April (see photo below). This is concerning, taking into the account that most people who visit the area are arriving as tourists, and are not aware of the potential dangers of a erupting volcano.
The volcanic-activity was at the same level today. A spike in ash-venting and ash-fall was osberved during the afternoon, but poor weather prevented photography.The current activity level, characterized by intermittent periods of degassing and ash eruptions/venting, seems to be slightly decreased compared to february levels. However the activity levels could increase again.
Source et photos : Oystein Lund Andersen ( http://www.oysteinlundandersen.com/ )
Villarica , Chile :
The volcano‘s activity level is: Level YELLOW: changes in the behavior of volcanic activity -Time For a probable eruption: weeks / months.
Based on the analysis of information obtained by monitoring equipment and the observation of volcanoes, the Volcano Observatory of the Southern Andes (OVDAS) of the National Service of Geology and Mining (SERNAGEOMIN), communicates the following :
In the first half of the month of April, a total of 1878 earthquakes were recorded:
1687 of them have been classified as long-period earthquakes (LP) related to fluid dynamics inside the volcano, with reduced displacement values (RDC) less than 20 cm2.
Note that on April 10 and 11, the LP activity recorded have decreased significantly and the 12, they become visible again, exceeding in size the level of tremor.
It was further classified, one hundred ninety-one (191) volcano-tectonic type events (VT) associated with fracturing of a rigid material. The event of highest magnitude presented a local energy (ML) equal to M 2.7 and was 4.6 km to the east (E) of the active crater with a depth of 3.8 km.
The appearance of « seismic shooting » VT type of earthquakes (recording of multiple events in a short time), although there had in the past, were more common from April 11.
Most events are concentrated as before, in an area of approximately 10 km of length elongated in the direction Northwest-Southeast, within the caldera.
The energy of the volcanic tremor signal (TR), also associated with the fluid dynamics inside the volcano showed a stable trend with reduced displacement values (DRC) averaged on 3cm2, values considered low, while the dominant frequencies persisted between 1.0 and 2.1 Hz mainly.
After minor crisis occurred on 03 April last, the energy measures and the reduced size of the tremor with an oscillating behavior in number, indicate a downward trend, a feature that persists until the publication of this report.
The microphone installed 4 km from the crater of the volcano recorded minor pulses associated with surface activity, which were down by day, reaching maximum pressure equal to 0,3Pa.
Images recorded with IP cameras installed near the volcano, the days without cloud cover showed a predominantly white degassing with maximum heights of the column about 600 meters and a continuous filament, without noting exceptional activity in the crater.
According to data obtained from 5 GNSS stations that control the deformation of the volcano, small variations in its two components, horizontal and vertical, have been observed.
The highest horizontal displacement rates were observed at the station located in the southeast area of the volcano, with rates of 0.3 cm / months. It was also noted that the length of the control line that crosses the volcano is stable. In addition the data of the two (2) inclinometers show variations of low amplitude that are not directly related to other parameters.
The data obtained by the equipment DOAS (Differential Absorption Spectrometer Optics) Station Los Nevados and Tralco, installed 10 km to the east–northeast (ENE) and 6 km to the east–southeast (ESE) of the active crater, respectively, recorded a monthly average value of sulfur dioxide emissions (SO2) of 865 ± 22 t / day and a maximum value of 1707 ± 59 / day associated with minor strombolian activity, which took place on April 3. It was then noticed an increase in SO2 emissions, perhaps associated with a new magmatic material contribution in the shallow layers of the volcano.
The satellite images of the OMI (Ozone Monitoring Instrument – Http://so2.gsfc.nasa.gov/) and NESDIS (National Environmental Satellite, Data and Information -http: //satepsanone.nesdis.noaa. gov), alerts of sulfur dioxide (SO2) into the atmosphere, have reported no abnormalities in the volcanic complex.
Thermal radiation released by Mirova (Middle Infra Red Observation) on its website (http://www.mirovaweb.it/), indicating significant changes in surface temperature, reported alerts (considered to be medium) in the area associated with the volcano throughout the month, with most thermal anomaly on April 3, with a value of volcanic radiative power (RVP) of 172MW.
The behavior of volcanic activity generally show a gradual reduction of its energy after minor crisis which took place on April 3.
However the appearance of « seismic shooting » concentrated preferably in the South-East of the main crater, suggest a possible movement magma at depth that could destabilize the system.
In this scenario, and considering the characteristic of the volcanic conduit of Villarrica, this opens the possibility of occurrence of explosions and strombolian activity, from low to high, with the dangers associated with the fallout of pyroclastic material in the adjacent area of the crater, higher than in recent months. Therefore, it is recommended as a preventive measure to apply restrictions on access to the proximal zone within a radius of 1.0 km from the crater center.
The volcanic alert level remains at Yellow with special attention.
Source : Sernageomin
Photos : Miguel Angel Albornoz ,María José Escobar.
Cleveland , Alaska :
52°49’20 » N 169°56’42 » W,
Summit Elevation 5676 ft (1730 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE
Carlisle, Cleveland and Herbert Volcanoes (right to left) seen from the summit ridge of Tana Volcano. Summits of Yunaska and Chagulak Volcanoes visible in the background.
No unusual seismicity has since been detected at Cleveland in the past 24 hours and no activity was observed in cloudy Satellite views.
Source : AVO
Photo : Lyons, John