After several days of very strong activity, the Poás Volcano in Costa Rica has started a period of relative quiet, though, the volcano remains exhaling fumes and vapor, experts think that under the current conditions more eruptions can be expected in a short term.

Vuelo para realizar mediciones de gases por medio de drone

Volcán Poás. 10 de mayo 2017. Vuelo para realizar mediciones de gases por medio de drone. Video: Maarten de Moor y Alfredo Alan. #OVSICORI

Posted by OVSICORI-UNA on Thursday, May 11, 2017

Strong evaporation is at the lake, with strong sub-aquatic fumaroles, the tremor that had been regular during the last few days dropped considerably as of yesterday; it now maintains a continuous low-amplitude tremor. Small phreatic eruptions are still present. There are no reports of ash fall.

Experts remain with the necessary research and have been measuring the gases with the use of a drone. They also inspected the trail that connects the observation deck at the National Park with the Botos Lake, this allowed them to confirm that this trail received the impact of more than 100 rocks, an impact every 10 square meters; these rocks landed with a temperature of over 100⁰C (212⁰F) which caused the vegetation to burn, experts also calculate the speed, height, trajectory and energy that the fragments had at the time of the eruption with the purpose of evaluating possible risks.

Volcán Turrialba. 2:30 pmEl geólogo de la CNE, Blas Sánchez se encuentra en Turrialba monitoreando los cauces de los ríos y la actividad del volcán Turrialba e informó que persiste la señal de tremor volcánico discontinuo de moderada a baja amplitud y una desgasificación moderada acompañada de una pluma de gases y aerosoles que se levanta unos 500 metros sobre el cráter activo. Se mantienen presentes sismos volcánicos discretos de baja frecuencia (LP) con baja amplitud, y algunos pequeños eventos sismicos de mayor frequencia (VT).

Posted by Comisión Nacional de Emergencias on Thursday, May 4, 2017

The Turrialba Volcano, has a discontinuous low-amplitude and short duration seismic signal; it registers small and short eruptions with ash emissions; actually, the activity in this volcano has been increasing in the last few days, with small explosions of gas and vapors as well as ash.

The Poás Volcano National Park remains closed for visitation, while the Turrialba National Park is open but access to the areas near to the crater are closed for safety reasons.


Costa Rica Star News. (2017). Update on the Activity of Turrialba and Poas Volcanoes Costa Rica – Costa Rica Star News. [online] Available at: [Accessed 15 May 2017].