December 16, 2015. EN. Colima, Sabancaya, Sheveluch .
December 16, 2015.
Colima, Mexico :
Elevation 3850 m
Mexicos Colima or Fire volcano roared to life, spewing columns of gas and ash into the sky early on 14 December. The first explosion took place in the early morning before sunrise and it was followed by another blast at 8.06am local time.
The National Civil Protection Coordinator Luis Felipe Puente said on his Twitter account that the column of ash and smoke rose 3,000 meters over the crater, before it was pulled by winds heading southeast. A third outburst took place at 11.41am local time, with the column rising to 1,500 meters.
Located in the southwestern Mexican state of Colima, the Fire Volcano has been exhibiting continuous activity since 9 July. Officially known as the Colima Volcano, it was previously active in January and February of 2015 .
Based on satellite images, wind data, webcam images, and notices from the Mexico City MWO, the Washington VAAC reported that during 2-7 December ash plumes from Colima rose to altitudes of 4.6-7.6 km (15,000-25,000 ft) a.s.l. and drifted multiple directions.
The Colima volcanic complex is the most prominent volcanic center of the western Mexican Volcanic Belt. It consists of two southward-younging volcanoes, Nevado de Colima (the 4320 m high point of the complex) on the north and the 3850-m-high historically active Volcán de Colima at the south. A group of cinder cones of late-Pleistocene age is located on the floor of the Colima graben west and east of the Colima complex. Volcán de Colima (also known as Volcán Fuego) is a youthful stratovolcano constructed within a 5-km-wide caldera, breached to the south, that has been the source of large debris avalanches. Major slope failures have occurred repeatedly from both the Nevado and Colima cones, and have produced a thick apron of debris-avalanche deposits on three sides of the complex. Frequent historical eruptions date back to the 16th century. Occasional major explosive eruptions (most recently in 1913) have destroyed the summit and left a deep, steep-sided crater that was slowly refilled and then overtopped by lava dome growth.
Sources : ibtimes.co.in ,GVP.
Photos : Hernando Rivera
Sabancaya, Peru :
The LP type of seismicity (associated with the passage of fluids), has dropped dramatically this week, from an average of 73 LP / day (Report No. 44-2015) to 9 LP / day. On the other hand, seismic energy LP remains at very low level.
In this period, the number of hybrid type events, HIB (associated with the rise of magma material) presented an average of 1 HIB / day, similar to the previous period.
Seismic Events VTPS or « proximal volcano-tectonic » (very close to the volcano, less than 6 km), showed a significant increase in number and magnitude. 205 events VTPS average / day (Report No. 44-2015: 19 VTPS / day were observed ), and magnitude between M1,5 and M4,0 (local magnitude). In addition, the maximum amplitudes were registered on December 10 and then declined.
The events of tremor types, for the fourth consecutive week have an average of 7 Tremor / day.
In general all type of events VT (break rock) approached the volcano, forming a highly sensitive seismic focus between 0 and 8 km from the crater, with depths between 3-15 km deep.
VTP events (proximal Tectonic Volcano) located within 6 km of the Sabancaya‘s crater were distributed mainly in a north – Northeast region. During this period, he had a significant growth in number and size, recording a total of 274 events VTP. The largest magnitude earthquake was located in the area and has reached M 4.0 , at a depth of 9 km (10/12/2015, 9h03 p.m. UTC), the event was located 5 km north – East of the crater.
The seismicity VTD (distal seismicity) decreased in number and size; In addition, she approached the volcano (between 6 and 8 km from the crater); distributed mainly in the north – Northeast of the crater.
The emission of steam and magmatic gases was constant during that week. The maximum height of fumaroles was between 800 and 1400 meters above the crater.
The monitoring of the density of SO2 and thermal anomalies, through satellite imagery indicate small values.
Source : IGP
Photos : O Macedo ( 2013) , IGP.
Sheveluch, Kamchatka :
56.64 N, 161.32 E
Elevation 10768 ft (3283 m)
the dome elevation ~8200 ft (2500 m)
Aviation Color Code is ORANGE
A growth of the lava dome continues, moderate ash explosions, hot avalanches, fumarole activity and incandescence of the dome summit and hot avalanches accompanies this process. Satellite data by KVERT showed a thermal anomaly over the volcano, ash plume drifted about 38 km south-east of the volcano.
A hot avalanche collapsed from eastern flank of the lava dome, and ash rise up to 3.5-4.0 km a.s.l. An ash plume drift to ESE of the volcano.
Explosive-extrusive eruption of the volcano continues. Ash explosions up to 32,800 ft (10 km) a.s.l. could occur at any time. Ongoing activity could affect international and low-flying aircraft.
Distance of ash plume/cloud of the volcano: 9 mi (15 km)
Direction of drift of ash plume/cloud of the volcano: ESE
Source : Kvert
Photo : Yu. Demyanchuk, IVS FEB RAS, KVERT