A gas meter is seen used by the Volcanological Institute of the Canary Islands (INVOLCAN) in Tazacorte, on the Canary Island of La Palma, Spain, September 18, 2021.

Volcano erupts on Spanish island of La Palma, Spain September 19, 2021.

Lava flows downhill following the eruption of a volcano in the Cumbre Vieja national park at El Paso, on the Canary Island of La Palma, September 19, 2021.

Technicians from the Geological Mining Institute of Spain make drones fly to make photogrammetry over the town of Jedey, on the Canary Island of La Palma, Spain, September 18, 2021.

Lava and smoke rise following the eruption of a volcano in the Cumbre Vieja national park at El Paso, on the Canary Island of La Palma, September 19, 2021.

Lava flows downhill following the eruption of a volcano in the Cumbre Vieja national park at El Paso, on the Canary Island of La Palma, September 19, 2021.

Lava and smoke rise following the eruption of a volcano in the Cumbre Vieja national park at El Paso, on the Canary Island of La Palma, September 19, 2021.

Two volcanologists from the Volcanological Institute of the Canary Islands (INVOLCAN) collect gas samples in Tazacorte, on the Canary Island of La Palma, Spain, September 18, 2021.

A plume of smoke rises following the eruption of a volcano in the Cumbre Vieja national park at El Paso, on the Canary Island of La Palma, September 19, 2021.

Lava rises following the eruption of a volcano in the Cumbre Vieja national park at El Paso, on the Canary Island of La Palma, September 19, 2021.

Lava flows next to a local police officer following the eruption of a volcano in the Cumbre Vieja national park at El Paso, on the Canary Island of La Palma, September 19, 2021.

A plume of smoke rises following the eruption of a volcano in the Cumbre Vieja national park at El Paso, on the Canary Island of La Palma, September 19, 2021.

Lava flows downhill following the eruption of a volcano in the Cumbre Vieja national park at El Paso, on the Canary Island of La Palma, September 19, 2021.

Two volcanologists Claudia Rodriguez y Beverley Coldwell from the Volcanological Institute of the Canary Islands (INVOLCAN) collect gas samples in Tazacorte, on the Canary Island of La Palma, Spain, September 18, 2021.

Police and civil guard members stand by as authorities on the Spanish Canary Island of La Palma are on alert for volcanic eruption, in La Palma, Spain, September 19, 2021.

Residents watch lava following the eruption of a volcano in the Cumbre Vieja national park at El Paso, on the Canary Island of La Palma, September 19, 2021.

Luis Perez, a resident of El Paso, prepares a suitcase with his clothes and necessary things to leave his house in case of an emergency, on the Canary Island of La Palma, Spain, September 19, 2021.

Technicians from the Geological Mining Institute of Spain make drones fly to make photogrammetry over the town of Jedey, on the Canary Island of La Palma, Spain, September 18, 2021.

Lava and smoke rise following the eruption of a volcano in the Cumbre Vieja national park at El Paso, on the Canary Island of La Palma, September 19, 2021.

Lava flows next to a house following the eruption of a volcano in the Cumbre Vieja national park at El Paso, on the Canary Island of La Palma, September 19, 2021.

Lava flows next to a house following the eruption of a volcano in the Cumbre Vieja national park at El Paso, on the Canary Island of La Palma, September 19, 2021.

An emergency helicopter of the Government of the Canary Islands flies over an area where seismic movements are being felt in El Paso, on the Canary Island of La Palma, Spain, September 19, 2021.