The Volcano Adventure Guide: Excellent information and background for anyone wishing to visit active volcanoes safely and enjoyably. The book presents guidelines to visiting 42 different volcanoes around the world.
Tungurahua is one of South America's most active volcanoes. Since 2000, a new lava dome has been growing in its summit crater. Tungurahua's activity has been characterized by frequent powerful ash explosions, producing ash plumes of several kilometers height as well as dangerous pyroclastic flows. Part of the population around its base has been evacuated.
Tungurahua volcano in apparent calm on 31 May 2016 (image: S. Mr. Aguaiza, OVT-IGEPN).
The Geophysical Institute warned that a new eruptive phase might be in the making at the volcano, which is one of the world's most active. Geophysical monitoring stations have been recording a significant, steady inflation (swelling) of the volcanic edifice. This is most likely a sign of new magma intruding at shallow depth. ...more
Seismic activity of the volcano has been generally low, with less than two earthquakes per day. Only some small earthquake swarms have been detected recently; such swarms are common in periods of quiescence and are associated with fluid movements within the volcano. Degassing of the volcano has also been at the lower end. However, this apparent calm could be deceiving: it might well be explained by a blockage of the conduit, not the absence of magma ready to erupt. [less]
Strong explosion from Tungurahua yesterday evening; a small pyroclastic flow can be seen departing from the base of the eruption column.
The activity remains very elevated at the volcano. During yesterday and the night, several more explosions occurred ejecting incandescent material that produced glowing avalanches of up to 1500 length mainly on the western and northwestern flanks. ...more
The ash plume continues to reach up to 30-32,000 ft (9-10 km) altitude and drifts SSE, Washington VAAC reports. [less]
Explosion at Tungurahua yesterday morning (image: EDUfoto / facebook.com/edufoto.org)
The activity of the volcano has strongly increased since last weekend - a new surge of magma has been arriving at the summit vent and is producing a violent eruption from the summit crater. Its climax so far occurred this morning, at 07:51 local time, when a powerful explosion generated an eruption column that rose approx. 6 km above the crater and reached an altitude of estimated 36,000 ft (11 km). Pyroclastic flows (generated by partial column collapse) descended over 2000 m towards the Mandur and Achupashal areas. ...more
Similar explosive activity, with increasing tendency, had already been occurring during the previous days, in particular since Sunday. Very strong explosions also occurred yesterday afternoon at 16:28 local time, two around noon (also yesterday), as well as at 19:35 and 05:35 local time on Sunday (6 March). All of them produced pyroclastic flows into various directions towards the western (Romero and Achupashal) and northern sectors (Mandur). Violent shock waves that rattled windows and doors and ground rumblings accompanied the explosions and most of the time, a steam and ash column was rising 3-4 km from the volcano. At night, explosions could be seen ejecting incandescent material to great height (many 100 meters) and distances over the volcano's cone, generating spectacular avalanches.
Steam and ash plume rising 3-4 km above Tunguarhua on 5 March (image: OVT-IGEPN
Damages corn fields (image: P. Espín Bedón OVT-IGEPN)
Strombolian eruption at Tungurahua on 2 March (photo: E. Gaunt - OVTIGEPN)
The volcano is in a phase of mild to moderate strombolian activity. Incandescent bombs are ejected to the upper slopes of the volcano, generating avalanches. Ash plumes rise up to a few km above the crater and drift mostly in westerly directions. ...more
Apparently, the large vent-clearing explosion on 27 Feb has opened the conduit to allow a sustained slow rise of magma and more gradual release of gas pressure in small discrete explosions (= strombolian activity). In its latest report, IGEPN published a series of remarkable photos taken during cloud-free periods at night. [less]
Ash emissions have continued after the powerful vent-clearing explosion on Sunday (27 Feb). During brief periods when cloud cover lifted, a steam-and ash column was seen rising 1,500 meters above the crater and heading west. ...more
Ash fall has been occurring in the sector of Mocha. Ground vibrations from the volcano could be felt in Manzano, Pillate, Patilahua and the Tungurahua Volcano Observatory. [less]
Two moderately large explosions occurred at the volcano yesterday noon from 12:12 local time. The first and larger explosion produced an ash plume that rose approx. 5000 meters above the summit. ...more
The ash plume dispersed mainly to the west and northwest where ash fall occurred in areas including Choglontús, Pillate, Cahuaji and El Manzano. According to IGEPN, the eruption - which came after a 3 months interval of quiet since last November - was most likely NOT the result of new magma, but instead of accumulated gas pressure in the upper conduit. Magmatic gasses (H2O, CO2 etc) still contained in older magma inside the conduit was being released quietly as the magma continued to cool and crystallize, but most of these gasses were being trapped beneath a solid plug. With time, the gas pressure increased to the critical point: the plug gave way in yesterday's explosions. [less]
Colima volcano photos: This beautiful stratovolcano in western Mexico is one of the most active volcanoes on the American continents. It is known for its often spectacular explosions and sometimes glowing avalanches.
A violent vulcanian-type explosion from Anak Krakatau in pictures step by step.
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