More than 750 small earthquakes were detected beneath Tenerife overnight, the Instituto Geográfico Nacional (IGN) reported. The seismic swarm ran from Wednesday evening into Thursday morning, marking the island’s tenth such episode since February. Despite the scale of the activity, IGN director Itahiza Domínguez said there is no evidence of an increased risk of volcanic eruption in the short or medium term.
Most of the tremors were too weak for residents to feel. Manual analysis identified around 100 earthquakes between July 22 and 23, while automated systems logged over 500 more. They were concentrated in a specific area west of Las Cañadas del Teide, mainly beneath Guía de Isora, Vilaflor de Chasna and Santiago del Teide, at depths of 10 to 15 kilometers.
The IGN said the seismic signals are predominantly hybrid events, combining rock fracturing with vibrations from fluids such as gas, water or magma. Hybrid earthquakes are common in volcanic regions worldwide, but occur unusually often in Tenerife. The current swarm began with weak tremors on Wednesday afternoon and intensified overnight, with events every 30 to 60 seconds. The IGN said similar swarms were observed in February, March and June, and the current activity remains within the range of recent patterns.
Domínguez said a shift toward an eruption would require stronger earthquakes and clear signs of magma moving toward the surface. Neither has been detected. The presence of volcano-tectonic, hybrid and low-frequency events, the last linked to deep fluid movement, does not by itself indicate that volcanic processes are accelerating. The IGN says the situation is stable and comparable to previous episodes this year.
Assessments of volcanic activity rely on more than earthquake counts. Domínguez has said monitoring requires continuous evaluation of “seismicity, ground deformation and gas emissions.” A separate IGN summary in October 2026 recorded 51 earthquakes across the Canary Islands over 30 days, with an average magnitude of 1.9. That archipelago-wide figure provides background context, not a direct measure of the swarm beneath Tenerife. The same summary reported an offshore earthquake near Tenerife with a magnitude of 2.2, at a depth of five kilometres and about 20 kilometres from the island. The IGN also attributed an earlier cluster north of Punta del Hidalgo to tectonic processes.
Reports on Tenerife’s volcanic-hydrothermal system describe elevated diffuse gas emissions and a process of pressurization dating from 2016, while stressing that these observations do not mean an eruption is imminent. The island’s yellow volcanic-risk status is not an eruption warning. Residents and visitors can continue normal activities while following Civil Protection instructions. The Canary Islands Volcanology Institute (INVOLCAN) and the IGN monitor seismicity alongside changes in deformation and gas measurements. Earthquake swarms alone do not establish that volcanic danger has increased.
Tenerife’s last eruption occurred in 1909 at the Chinyero volcano and lasted just ten days. Earlier eruptions, including those at Siete Fuentes, Fasnia, Arafo (1704 to 1705), Garachico (1706) and the Narices del Teide or Chahorra (1798), have shaped the island’s volcanic field. Tenerife is currently classified as dormant, but occasional seismic swarms, including the impressive episode in 2004, have prompted speculation about renewed volcanic activity. That speculation ultimately proved unfounded.
Spain’s volcanic monitoring has drawn more attention in recent years, especially after the 2021 La Palma eruption, which lasted 85 days and caused impressive disruption. Authorities are closely tracking the situation in Tenerife, with no changes to risk levels or public safety measures at this time. For context on monitoring extreme weather and natural events across Spain, see this report on recent severe storms and hail alerts in the southeast.
Preparedness exercises are separate from actual volcanic alerts. In October 2026, Tenerife authorities held VOLCANEX, a drill involving about 1,500 people and 70 public bodies, with simulated alerts, evacuations and the closure of Teide National Park. The scenario covered Guía de Isora, Santiago del Teide and Adeje. Officials said the exercise notices did not indicate a real volcanic emergency. The drill tested communications and coordination for a possible future crisis, not a response to an ongoing eruption.
Tenerife’s complex geology, with hundreds of volcanic vents, makes periodic seismic activity unsurprising. The IGN continues to monitor the situation and says further swarms may occur or subside without warning. The agency’s assessment remains unchanged: there is no indication of an imminent eruption, and the island remains classified as a dormant volcano.
