Satellite Imagery Captures Rare Atmospheric Phenomenon During 2021 La Palma Eruption
In October 2021, NASA’s Aqua satellite captured a striking image of concentric cloud rings forming above the erupting Tajogaite vent on La Palma, Canary Islands. These formations, known as gravity waves, were created when a temperature inversion acted as an atmospheric lid, preventing the volcanic plume from rising into the stratosphere and forcing it to spread outward in distinct pulses. The eruption, which began on September 19, 2021, lasted 85 days and remains one of the most significant geological events in the region in half a century.
How Did the Concentric Cloud Rings Form?
The “bull’s-eye” patterns observed by satellites were the result of a rare meteorological interaction between the volcanic plume and the local atmosphere. According to NASA’s Earth Observatory, a temperature inversion—a layer of warm air sitting above cooler air—prevented the steam, ash, and volcanic gases from ascending into the stratosphere. Because the plume could not move vertically, it was forced to expand horizontally. The concentric rings themselves represent the natural ebb and flow in the intensity of the volcanic activity, creating pulses in the emissions that rippled outward like waves in a pond.
The Timeline and Impact of the Tajogaite Eruption
The eruption began on the western flank of the Cumbre Vieja volcanic ridge, creating a new vent eventually named Tajogaite. Over the course of 85 days, the volcano discharged approximately 7.1 billion cubic feet of lava, according to data reported by El País. The molten rock, reaching temperatures of 2,000 degrees Fahrenheit, traveled roughly four miles toward the Atlantic Ocean. The flow destroyed approximately 3,000 buildings, primarily in the town of Todoque, resulting in economic damages exceeding 700 million euros.
Environmental and Public Health Consequences
The interaction between molten lava and seawater caused significant environmental hazards. As the lava entered the Atlantic, it triggered chemical reactions that released high concentrations of volcanic gases, including sulfur dioxide and hydrogen cyanide. These emissions posed severe health risks to the local population. According to reports from AFP, one fatality was attributed to the inhalation of these toxic fumes when a resident returned to his home within the exclusion zone prematurely. Beyond the human toll, thousands of agricultural and wild animals perished due to the poor air quality and physical destruction of their habitats.
Comparing Volcanic Plume Formations
While the La Palma rings were a result of a specific temperature inversion, volcanic plumes often take on distinct shapes based on environmental conditions. The following table highlights differences in how volcanic activity is visualized from space:
| Phenomenon | Cause | Primary Observation Method |
|---|---|---|
| Gravity Waves (La Palma) | Temperature inversion trapping vertical rise | Visible light satellite imagery |
| Thermal Infrared Plumes | High-heat output from lava flows | Infrared satellite sensors |
| Volcanic “Eyes” | Erosion of volcanic calderas over time | High-resolution orbital photography |
Why This Eruption Remains Significant
The Tajogaite eruption is notable for the proximity of the vent to established residential communities. Volcanologist Marie Edmonds of the University of Cambridge noted that the event was particularly harrowing due to the immediate threat it posed to local infrastructure and daily life. The eruption officially concluded on December 13, 2021, but the geological and social impacts persist. The formation of approximately 430,000 square meters of new land where the lava met the sea remains a subject of ongoing study for geologists monitoring the long-term stability of the Canary Islands’ volcanic terrain.