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Costa Rica declared a state of emergency Thursday after eruptions of ash from a volcano forced international flights to be postponed and threatened the capital, authorities said.
"For several days now volcano Turrialba has had continual eruptions marked by the constant expulsion of ash," the National Emergencies Commission (CNE) said in a statement.
It declared a state of emergency for the capital San Jose and other central cities.
The Seismological and Vulcanological Observatory at Costa Rica University said a seismic tremor was detected that was growing in intensity.
I think spitting ash is considered a form of eruption. There are different types of eruptions, some violent and explosive and some minor "leaks" and many types between. Apparently seismic activity of the Turrialba volcano preceded the Dec 28 explosion:
originally posted by: carewemust
Do most volcanos go into full eruption after an increased and prolonged period of spitting?
Apparently it's been erupting since 2010 and the eruption levels vary like that from low seismic activity and low ash eruption to larger seismic activity and explosions like happened on Dec 28.
Mauricio Mora, a volcanologist with the University of Costa Rica’s National Seismological Network (RSN), said in a public report that activity at Turrialba between Dec. 15 – 27 was mostly low with very low seismic activity and sporadic and weak ash spewings.
“Starting on December 28, however, we recorded an increase in seismic activity, with volcanic tremors lasting between 4-7 minutes,” he said. This spike in the activity resulted in a strong explosion at 23:00 hours that hurled incandescent rocks around the crater, Mora said.
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Bulusan Luzon (Philippines) Ongoing
Colima Mexico Ongoing
Copahue Central Chile-Argentina border Ongoing
Dukono Halmahera (Indonesia) Ongoing
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Turrialba Costa Rica Ongoing
Costa Rica’s Central Valley on alert after Turrialba volcano becomes increasingly active
The volcano’s constant eruptions are sending plumes of ash in to the sky
Loulla-Mae Eleftheriou-Smith Monday 9 January 2017
Costa Rica has declared a state of emergency for a major area of the country including the capital of San Jose following the constant eruptions of ash from one of its largest volcanos, according to AFP.
“For several days now volcano Turrialba has had continual eruptions marked by the constant expulsion of ash,” the National Emergencies Commission (CNE) said in a statement.