January 09 , 2016. EN. Nevados De Chillan , Turrialba , Colima .
January 09 , 2016.
Nevados De Chillan , Chile :
Special volcanic activity report (REAV)
January 08 , 2016 19: 00 HL
The National Geology and Mining Service (SERNAGEOMIN) – Observatorio Volcanológico of the southern Andes (OVDAS) announces that Friday, January 8, 2016 at 5:56 p.m. local time (20: 56GMT), there was of short duration emission of ashes from volcanic Nevados de Chillan complex associated with the recording of a LP type event (related to fluid dynamics inside the volcano) with a local magnitude of M 2.9, suggesting activity from a deep hydrothermal system, consistent with the scenario described in the latest report.
Subsequently to the emission, , seismic activity returned to levels recorded before the event. In the present scenario, it is likely to produce new ash emissions, linked to a process of destabilization of the hydrothermal system, following a transfer of heat driven by a deep underlying magma body.
The level of volcanic technically alert remains at Amarillo, with particular attention to the temporary evolution.
It is suggested to limit access to the surrounding areas of the Southern Cone Crater (1 km radius) and areas of fumaroles.
SERNAGEOMIN -OVDAS continuous online monitoring, and report timely to the changes in volcanic activity in the region.
The Nevados de Chillan volcanic complex includes a series of volcanoes and volcanic centers, focused Northwest / Southeast to 7.5 km in length: the Santa Gertrudis (volcano with the most recent eruption in 1861 that caused by lahars in Ñuble river); the volcano Cerro Blanco (the largest); Secondary craters in an ancient caldera; Nuevo volcano (formed in 1906); the volcano Arrau (formed in 1973); the last small secondary craters Chudcún (2003) and Sebastian (2008), the sub-complex Las Termas; and finally Viejo volcano.
Note: cooperativa.cl announcement on its website preventive evacuations of residents and tourists.
Source : Observatoire volcanologique des Andes du Sud (OVDAS)
Service national de géologie et des mines (SERNAGEOMIN)
Photos : T13.cl, sernageomin.
Turrialba, Costa Rica :
On January 8, 2016 at 12:30 a new small explosion occurred on the Turrialba volcano, similar to those observed on 3 and 6 January this year. Seismic activity remained low to moderate.
On January 6, 2016 at 11:56 there was a small eruption which has produced an ash column of about 100 meters which rose from the crater to the west. Most ash fallout in the crater. The eruption left a seismic signal recorded on the seismograph network of OVSICORI–UNA, located on the volcano.
According to the AERMOD computer , modeling used to stimulate how gases and particles emitted by the Turrialba volcano are scattered, the materials would be transported by winds over the region including Tres Ríos, La Carpintera, San Marcos Tarrazú, Quepos, and towards The pacific . However, with this small eruption from low volume of ashes, no cases of ash falls are expected on the populations located to the west of the volcano.
The RSN will continue to monitor any developments in the activity of the volcano.
Source : Ovsicori
Colima, Mexico :
Elevation 3850 m
Based on satellite images, wind data, webcam images, and notices from the Mexico City MWO, the Washington VAAC reported that during 30 December-3 January and 5 January ash plumes from Colima rose to altitudes of 4.6-6.7 km (15,000-22,000 ft) a.s.l. and drifted NW, N, NE, and E.
The volcano continues to produce explosive eruptions midsize at irregular intervals ranging from 2 to 8 hours.
Most explosions are rich in ash and accompanied by electrostatic events (lightning) in the eruption column.
Source: Washington Volcanic Ash Advisory Center (VAAC)
Photo : Hernando Rivera