Monday 14 June 2021

Central Crater Of The Turrialba Volcano Rose 10 Metres In The Last 2 Years

These curious formations in the central crater (not the active crater) of the Turrialba volcano are caused by the accumulation and erosion of the ash. The thickness of the ash here varies between 60 and 80 centimetres according to summarizes the report of the volcanologist Eliécer Duarte, of the National University. Photo OVSICORI

Q COSTA RICA – The bottom of the central crater of Turrialba volcano rose 10 metres in the last two years, due to erosion and constant eruptions of the colossus, confirm experts of the Observatorio Vulcanológico y Sismológico de Costa Rica (Ovsicori).

Of those 10 metres, six are already under rainwater that accumulates in this crater, located to the east of the active crater.

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According to the field work of volcanologist Eliécer Duarte, this ash and stone filled crater was formed mainly by the eruption of October 29, 2014 and the two months of eruptive activity between September and November of 2016.

The data, published by the Volcanological and Seismological Observatory of Costa Rica,  analyzes the evolution of the central crater bottom between November 2, 2014 and December 15, 2016.

For example, during the visit in November 2014 a rock was photographed 100 metres from the central crater, which was 2.4 metres high. Two years and a month later, only 1.4 metres of the stone is visible, the remaining is under the accumulated ash.

“If the emission levels of ash and other materials from the active crater is maintained – with easterly winds – it is likely that the central crater cavity will be completely covered.”

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There is no deadline for this situation to occur, according to the experts.

During the last inspection, Duarte explained he was also able to document the textures of the different layers of ash that have been collected on the walls of the crater. As a product of erosion, these have acquired impressive shapes, with “esthetic” value for specialists and depths ranging between 60 and 80 centimetres.

Recent behavior
In the last weeks, the Turrialba has maintained a passive but constant activity, with emanations of gases and ashes.

On 25 December there was an increase in the magnitude of volcanic earthquake between 2:00am and 4:00am and a plume with abundant gases and ash.

The emanations reached areas such as Granadilla de Curridabat, Guadalupe, Ipís, Calle Blancos, Goicoechea, Sabanilla, Moravia, Dulce Nombre de Coronado, all areas east and north of San Jose and Piedades de Santa Ana on the west side.

Source La Nacion

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