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MADRID (AP) — A series of small earthquakes in Spain’s Canary Islands has put authorities on alert for a possible volcanic eruption, with one official saying Thursday there is “intense seismic activity” in the area off northwest Africa.

Authorities have detected more than 4,200 temblors in what scientists are calling an “earthquake swarm” around La Palma island since last Saturday. An earthquake swarm is a cluster of quakes in one area during a short period and can indicate an approaching eruption.

But officials said they had no indication an eruption was imminent, and a scientific committee monitoring the activity said that the number of tremors and their magnitude had fallen Thursday.

Even so, the Scientific Committee for the Special Civil Protection Plan and Emergency Response for Volcanic Risks warned there could be a rapid, renewed surge in quakes and kept the public warning level on yellow, according to private Spanish news agency Europa Press.

Volcano warnings are announced in accordance with the level of risk, rising through green, yellow, orange and red.

The committee reported that ground depressions up to 10 centimeters (4 inches) deep have formed — an occurrence often attributed to magma movements.

Before a volcano erupts, there is a gradual increase in seismic activity that can build up over a prolonged period.

The Canary Islands Volcanology Institute said that by Thursday 11 million cubic meters (388 million cubic feet) of molten rock had been pushed into Cumbre Vieja, a dormant volcanic ridge on La Palma where the last eruption was in 1971. The strongest quake so far was a magnitude 3.4 one, according to the institute.

La Palma has a population of around 85,000 people.

The institute has is telling staff on the island to monitor any changes, including testing the water in wells.

The Canary Islands are a volcanic archipelago made up of eight islands. At their nearest point to Africa, they are 100 kilometers (60 miles) from Morocco.

Copyright 2021 The Associated Press. All rights reserved.

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Threat of Volcanic Eruption Puts Spanish island on Alert