Small Seismic Swarm Detected Off the East Coast of Tenerife

The National Geographic Institute (IGN) has reported a new series of volcano-tectonic earthquakes off the east coast of Tenerife, recorded during Thursday night and Friday morning (17 October 2025). This seismic activity has raised awareness among both residents and visitors to the island, prompting discussions about the geological dynamics at play in this volcanic region.

Details of the Earthquakes

Most of the tremors were located off the municipality of Fasnia, situated on the eastern coast of Tenerife, at an average depth of around 25 kilometers below sea level. The earthquakes exhibited magnitudes ranging from 0.8 to 2.2 on the Richter scale. In total, 15 quakes were detected, with nine of these events being precisely located based on data provided by the IGN.

The largest event recorded was a magnitude 2.2 mbLg quake, which occurred at 7:39 am on Friday, positioned to the southeast of Fasnia at an estimated depth of 24 kilometers. Other notable quakes in the same vicinity included two events that registered magnitudes of 1.7 mbLg, occurring at 5:53 am and 10:26 pm on Thursday, both at depths ranging from 25 to 27 kilometers. Additionally, a further quake measuring 1.6 mbLg was detected east of Arico at 10:37 am on Friday, also at a depth of 26 kilometers.

Causes and Monitoring

The seismic events are attributed to fracturing in the Earth’s crust, which is linked to internal stresses associated with volcanic processes. Such earthquakes often manifest in swarms, particularly during periods of magma intrusion or gas accumulation underground. While these swarms can be part of the normal background activity in volcanic islands like Tenerife, they do not necessarily indicate that an eruption is imminent. This distinction is crucial for both residents and tourists, as it helps to alleviate concerns about potential volcanic hazards.

The IGN remains vigilant in monitoring seismicity across the Canary Islands, employing advanced technology to track and analyze seismic events in real time. The institute updates its records promptly as new events are detected, ensuring that the public is informed about any significant changes in seismic activity. As of now, no damage has been reported, and daily life on the island continues as normal. Both tourists and residents are encouraged to stay informed by following official updates from the IGN and local authorities, which provide guidance and information on safety measures.

Community Response and Preparedness

The recent seismic activity has prompted discussions within the local community regarding preparedness for potential volcanic events. Residents are reminded of the importance of being aware of emergency procedures and evacuation routes, especially in a region where volcanic activity is a natural part of the landscape. Local authorities have reiterated their commitment to ensuring the safety of both residents and visitors, emphasizing the need for vigilance without inciting unnecessary alarm.

In light of these events, educational initiatives are being reinforced to inform the public about the geological characteristics of the Canary Islands and the nature of volcanic activity. Schools and community organizations are encouraged to participate in workshops and seminars that focus on understanding seismic phenomena and the history of volcanic eruptions in the region. This proactive approach aims to foster a culture of preparedness and resilience among the island’s inhabitants.

Key Points

• A series of volcano-tectonic earthquakes was detected off the east coast of Tenerife on 17 October 2025.
• Most tremors were located near Fasnia at an average depth of 25 kilometers.
• The largest quake registered a magnitude of 2.2 mbLg at 7:39 am on Friday.
• In total, 15 earthquakes were recorded, with nine precisely located.
• IGN continues to monitor seismic activity in the Canary Islands.
• No damage has been reported, and daily life continues as normal.
• Residents and tourists are advised to stay informed through official updates.
• Community preparedness initiatives are being reinforced in response to the seismic activity.