Tourists heading to Tenerife have been warned to expect a "potentially scary" volcano alert during their trip as underground tremors continue to rattle the island.

Mount Teide, Spain's highest peak, has been the focus of reports in recent weeks after a swarm of small earthquakes raised fears of volcanic activity, reports MirrorOnline.

Experts insist the island is not facing an imminent eruption, but residents and visitors will soon receive an "eruption" alert message on their phones.

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The warning, part of Spain's largest ever volcanic emergency drill, will come on September 26.

For the first time, an entire municipality will rehearse an evac

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