On Sept. 11, an earthquake swarm began rocking the volcano, foreshadowing an ominous development to come. Authorities issued a yellow alert for part of the island on Sept. 13, the second-highest tier of advisory that can be issued for an imminent or expected eruption. According to Spanish newspaper El País, about 35,000 people were included in the alert.
Source Article from https://www.washingtonpost.com/weather/2021/09/24/la-palma-volcano-canary-islands/
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