Tenerife authorities have urged residents to remain calm after an unusual seismic event was recorded beneath the island's volcano earlier this week.
Scientists confirmed there is no immediate threat of an eruption following the unprecedented tremor - but said one "will happen".
An emergency meeting of Pevolca, the Canary Islands' volcanic risk civil protection body, was convened after an hour-long rumbling was detected on Tuesday.
The Ministry of Territorial Policy subsequently held a press conference to address growing public concern.
A shorter seismic pulse lasting several minutes was also recorded on Wednesday.
Experts said they would stay on alert following the intense seismic episodes.
Itahiza Dominguez, director of the National Geographic Institute in the Canary Islands, explained: "We saw a small pulse similar to Tuesday's but it only lasted about seven or eight minutes.
"In the last 10 years, we have detected low-frequency signals but they usually last four or five minutes.
"Never, until Tuesday, have we seen such a prolonged signal."
The signals originate from vibrating fluids, including magma, at depths of 10 to 12 kilometres below the surface.
Mount Teide is Spain's tallest mountain | GETTYSuch activity cannot be detected without specialist equipment.
"Someday there will be an eruption but we do not know if it will be in a year or 50," Mr Dominguez said.
Rosa Davila, the President of Tenerife's governing body, also told locals and tourists to stay calm - and stressed there was no evidence suggesting an eruption was imminent.
"Probably one of the most monitored volcanic systems in the world is Mount Teide and the island of Tenerife," Ms Davila said.
EARTHQUAKES AND VOLCANOES - READ MORE:
PICTURED: A view of Tenerife - with Mount Teide looming in the background
| GETTYShe confirmed that gas emissions and ground deformation have remained unchanged.
"We are not seeing what we saw in La Palma in the weeks before the eruption in 2021," Mr Dominguez added.
He noted that while this type of signal is new to Tenerife, it occurs frequently at volcanoes elsewhere around the globe.
The local government has scheduled emergency drills in Guia de Isora and Santiago del Teide.
Mr Dominguez said the situation was not like that seen before the 2021 La Palma eruption
|GETTY
These exercises will train residents in the proper use of emergency equipment.
Town mayors have additionally received instructions to revise their emergency and self-protection plans.
Pevolca is set to reconvene on Thursday to review the volcanic situation.
"We have been observing these signals for a long time, although never so long. They indicate that Tenerife is a volcanically active island," Mr Dominguez said.
"For now we can say that there is tranquillity, the activity remains as previously."
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