Scientists warn the situation is still tense and unpredictable as the Cumbre Vieja volcano continues to erupt on the Spanish island of La Palma.
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A cloud of ash and dust from an erupting volcano forced the airport on the Spanish island of La Palma to shut down again on Thursday.
The Cumbre Vieja volcano has been erupting for almost three weeks, prompting the evacuation of more than 6,000 people and destroying hundreds of homes.
Scientists said the course of the eruption was unpredictable. It settled down in recent days, but the volcano continues to spew lava, and 16 earthquakes of up to magnitude 3.5 shook the area over the previous 24 hours, the National Geographic Institute said.
The ash cloud temporarily closed La Palma Airport last month.
Officials said the molten rock from the crater is now flowing down a so-called lava tube beneath earlier, hardened lava, straight into the sea. That has eased fears it could spread wider and cause more destruction.
The German Research Center for Geosciences, which sent a team to La Palma, said the lava flow is 6,300 meters long, more than 1,000 meters wide at its broadest point, and up to 25 meters thick.
The centre's volcano researcher, Thomas Walter, said the situation is still tense and unpredictable.
“It is still too early to say...how this eruption will develop,” he said in a statement.
Prompt evacuations helped avoid casualties from the eruption, and most of the island of around 85,000 people is unaffected.
The volcanic Canary Islands lie off the northwest coast of Africa.