01/06/2015 . Guallatiri , Popocatepetl , Shishaldin.
Guallatiri , Chili :
The Servicio Nacional de Geologia y Mineria (SERNAGEOMIN), operated by the Red Nacional de Vigilancia Volcánica de Chile, said a yellow alert for volcano Guallatiri after its activity has exceeded the reference level thresholds, particularly strain gauges .
The institution indicated that the monitoring stations in the area detected a tremor first isolated ground and later a “seismic activity” in addition to maintaining usual activity fumaroles. Guallatiri is located in the town of Putre, Province of Parinacota, Region of Arica and Parinacota, near the border of Chile and Bolivia.
SERNAGEOMIN reports that “May 31, 2015 at 0:04 local time (3:04 GMT), the occurrence of certain seismic events in a short period of time, consists of volcano-tectonic earthquakes (VT associated with rock fracturing) were recorded . The highest energy was located 3.3 km to the southeast (SE) of the main crater. Later, at 5:17 am (8:17 GMT), tremor additional land, also related to rock fracturing was recorded. It was located 8.4 km to the southwest (SW) of the main crater. “
The national director of the organization, Rodrigo Alvarez Seguel, said that “seismic swarm lasted about 10 minutes and presented 22 volcano-tectonic events, which are a type that concerns only the fracturing of the rock. The persistence this type of seismic activity in the hours that followed prompted the declaration of a yellow alert, which essentially means that the volcano has exceeded its baseline.
Besides the above, there has been a change in the stations monitoring the deformation (inflation of the surface) by inclinometers installed near the volcano. The two stations, in particular closest to the crater, indicate a change in its components, suggesting minor changes to the soil surface, obvious from May 28 When it is possible to have a visibility of surface activity recorded by the IP camera installed near the volcano has a white column of gas, less than 200 m on average, above the crater.
Guallatiri at an altitude of 6071 meters above sea level, with a volume of about 40 cubic kilometers. Its typology corresponds to a stratovolcano, as they are called cone-shaped volcanoes, which are built on the basis of successive volcanic eruptions with accumulation of material layers. Guallatiri consists of dacite domes and pyroclastic cone on top. Geochemically, composed of andesites (58% SiO2) to rhyolites (75% SiO2), with predominance of dacite (63% SiO2-70% SiO2). The volcano has a glacier at its summit and high flanks. Usually its current activity, has a permanent vent (solfataric with sulfur deposit).
Its history, established by SERNAGEOMIN studies, is marked by minor ash eruptions which were issued intermittently during the first half of the nineteenth century. In 1913 and 1959, a glow was observed in the summit crater and may have been associated with small Strombolian eruptions. In 1960, were described phreatic explosions. His most recent eruptive cycle happened between 1985 and 1987 when the fumaroles (solfataric) increased with yellow gas pulses (sulfur) and water vapor, which reached 500 meters above the crater every 30 minutes.
Source : Sernageomin
Photo : Sernageomin , Publimetro.
Popocatepetl, Mexique :
May 31 11:00 h (May 31 16:00 GMT)
In the last 24 hours the seismic monitoring system of Popocatepetl volcano registered 145 low-intensity exhalations and 36 explosions, some of which included emissions of steam, gas and ash. The day yesterday a train explosion was recorded at 16:00 and finalized at 19:18 . Additionally present 35 minutes harmonium tremor and a volcanotectonico earthquake at 08:38 with Mc.1.7
At night was not observed incandescence over the crater because of high clouds.
During the morning it has had little visibility into the volcano, which has a continuous emission of steam and gas direction northeast.
CENACOM reports ashfall in communities of Estado de México.
CENAPRED emphasizes that people SHOULD NOT go near the volcano, especially near the crater, due to the hazard caused by ballistic fragments .
Source : Cenapred
Photo : Karel del Angel
Shishaldin, Alaska :
54 ° 45’19 “N 163 ° 58’16” W,
Summit Elevation 9373 ft (2857 m)
Current Volcano Alert Level: WATCH
Current Aviation Color Code: ORANGE
No significant activity was observed in cloudy satellite and web camera images in the past 24 hours. Weakly elevated surface temperatures at the summit were visible in several satellite images. Continuous seismic tremor indicates that low-level eruptive activity continues in the summit crater.
Source : AVO
Photo : AVO