Hayli Gubbi Volcanic Eruption in Ethiopia
Table of Contents
Source: The Hindu
Relevance: GS-I (Geography); GS-III (Environment & Disaster Management)
Key Concepts for Prelims and Mains:
For Prelims:
• Stratovolcano • Volcanic Ash Plume • SO₂ Gas Hazard • Flight Diversion Protocols • High-Altitude Atmospheric Circulation
• Afar Rift Valley • Explosive Eruption
For Mains:
• Disaster Preparedness & Early Warning • Aviation Safety & Volcanic Hazards
• Geological Timescales • Transboundary Environmental Impacts
• Role of IMD & Volcanic Ash Advisory Centres (VAACs)
Why in News?
Ethiopia’s Hayli Gubbi volcano erupted on 23 November 2025 after nearly 12,000 years, sending a high-altitude ash plume that reached Indian airspace and disrupted international flights. The IMD says the plume will shift towards China by Tuesday evening.
What happened in Ethiopia?
The Hayli Gubbi volcano, located in northeastern Ethiopia near the Red Sea coastline, erupted on Sunday in what scientists describe as a highly unusual event. Geological records suggest the last eruption occurred nearly 12 millennia ago.
This eruption did not produce lava or magma flows. Instead, it resulted in a sudden explosive ejection of gases and fine ash, including tiny fragments of rock, volcanic glass, and other particulates.
How did the ash plume reach India?
Atmospheric circulation at high altitudes carried the plume across:
- The Arabian Peninsula
- The Arabian Sea
- Western India, entering through Gujarat and Rajasthan
- Northern India, including Delhi and Uttar Pradesh
The plume’s movement aligned with strong
southwesterly to northeasterly winds typically present at 10–14 km altitude—the same zone where most long-haul aircraft operate. IMD reported that the plume would continue along the same trajectory toward China, clearing Indian airspace by Tuesday evening.
What is a Volcano?
A volcano is an opening or vent in the Earth’s crust from which lava, ash, steam, and gases are expelled during an eruption. These vents generally form in structurally weak zones of the crust.
Volcanic activity is an important endogenic process, capable of creating landforms such as:
• Extrusive forms – plateaus, cones, domes
• Intrusive forms – batholiths, laccoliths, sills, dykes
Magma vs Lava
• Magma refers to molten rock material stored beneath the Earth’s surface, mainly originating from the partially molten asthenosphere.
• When magma emerges through a volcanic vent and reaches the surface, it is called lava.
Predicting Volcanic Eruptions
Several scientific tools help forecast potential volcanic activity:
1. Seismic Monitoring
Earthquakes, tremors, and harmonic vibrations often precede magma movement.
2. Ground Deformation
Bulging, uplift, or subsidence of the Earth’s surface indicates magma accumulating below.
3. Gas and Gravity Analysis
Changes in volcanic gas emissions (e.g., SO₂), gravity anomalies, and magnetic variations help assess magma ascent.
Types of Volcanoes
Volcanoes can be classified based on eruption frequency and eruption style.
A. Based on Frequency of Eruption
1. Active Volcanoes
These erupt frequently or show ongoing signs of activity. Most active volcanoes lie in the Pacific Ring of Fire, a tectonically active belt from New Zealand to Japan and along the western Americas.
Examples: Kilauea (Hawaii), Santa Maria (Guatemala).
2. Dormant Volcanoes
These have not erupted in recent times but retain the potential to erupt again.
Example: Mount Kilimanjaro (Tanzania).
3. Extinct Volcanoes
These volcanoes show no signs of eruption in the distant geological past.
Example: Dhinodhar Hill (Gujarat).
B. Based on the Nature of Eruption
1. Shield Volcanoes
• Largest and broadest volcanoes with gentle slopes.
• Formed mainly by low-viscosity basaltic lava.
• Eruptions are mostly effusive, unless water interaction increases explosivity.
• Lava may initially build a cinder cone but later spreads widely.
Example: Hawaiian volcanoes, Mauna Loa.
2. Composite Volcanoes (Stratovolcanoes)
• Tall, steep-sided volcanic cones made of alternating layers of lava, ash, and pyroclasts.
• Eruptions are usually explosive due to thick, viscous magma.
• Common in subduction zones, especially along the Pacific Ring of Fire.
Examples: Mayon (Philippines), Mount Fuji (Japan), Mount Rainier (USA).
3. Calderas
• Formed by extremely explosive eruptions where the magma chamber collapses, creating a large depression instead of building a cone.
• Among the most violent volcanic features.
4. Flood Basalt Provinces
• Characterized by eruption of highly fluid lava that spreads over vast areas.
• Creates thick sequences of basalt layers.
• Associated with large igneous provinces and mantle plumes.
5. Mid-Ocean Ridge Volcanoes
• Found along the mid-ocean ridge system, stretching over 65,000 km.
• These underwater volcanoes erupt frequently where tectonic plates diverge, producing new oceanic crust.
Was the plume dangerous?
For people on the ground: No immediate threat
Since the ash travelled at very high altitudes, human health was not at risk. The concentration at ground level remained negligible.
For aviation: Significant risk
Volcanic ash is a major hazard for aircraft because:
- Visibility can be severely reduced at cruising altitudes.
- Fine volcanic particles can clog sensors and filters.
- Ash entering aircraft engines can melt, solidify, and cause engine stall or failure.
- Gases like SO₂ can corrode aircraft components and reduce air quality inside cabins if filtration is compromised.
Because of these risks, airlines rerouted or delayed numerous international flights. Global aviation safety relies on real-time alerts from the Volcanic Ash Advisory Centres (VAACs), which tracked the Hayli Gubbi plume and coordinated warnings with civil aviation authorities.
How long will the impact last?
Experts say the effects are short-lived:
- Ash particles: These disperse rapidly over 24–48 hours due to wind spread.
- Rainfall and cloud moisture: Help wash out significantly large concentrations.
- Gases (SO₂, CO₂): Can linger longer but are too dilute to affect atmospheric composition or air quality meaningfully.
IMD has confirmed that by Tuesday evening, flight routes will gradually return to normal as the plume moves out of Indian airspace.
Why was this eruption significant?
- It occurred after 12,000 years of inactivity, making it a rare geological event.
- The plume reached transcontinental distances, demonstrating how volcanic activity anywhere can impact global aviation.
- It highlights the vulnerability of modern transport systems to natural events, even those occurring thousands of kilometres away.
Impacts of Volcanic Eruptions
Volcanic eruptions produce a range of destructive as well as constructive effects, influencing human settlements, ecosystems, climate systems, and landform development.
Destructive Effects of Volcanism
1. Earthquakes
Movement of magma beneath a volcano often induces seismic tremors. These shocks can generate surface cracks, landslides, and structural collapse—posing severe risks to densely populated regions near active volcanoes.
2. Climate Impacts
Volcanoes emit large quantities of ash, sulphur dioxide (SO₂), and other gases that can alter atmospheric circulation. Sulphate aerosols may cool the Earth temporarily, while ash clouds disrupt weather patterns and reduce solar radiation.
3. Pyroclastic Flows
Explosive eruptions can generate fast-moving, superheated clouds of ash, gas, and rock fragments. These pyroclastic flows travel at high speeds and extreme temperatures, destroying everything in their path within minutes.
4. Volcanic Ash Hazards
Fine ash particles can cause severe respiratory issues, contaminate water supplies, reduce visibility, and disrupt aviation. Heavy ashfall can collapse roofs and damage crops and machinery.
Constructive Effects of Volcanism
1. Fertile Soils
Volcanic ash weathers into mineral-rich soils containing silica, iron, potassium, and magnesium. Such soils—found in regions like Java and the Deccan—are among the most productive agricultural lands.
2. Land Formation
Successive lava flows can build new landmasses. The Hawaiian Islands are classic examples of volcanic island formation.
3. Contact Metamorphism
Heat from intruding magma alters surrounding rocks, producing valuable metamorphic rocks such as marble, quartzite, and hornfels. This process also contributes to mineralization and ore formation.
4. Volcanic and Crater Lakes
Large volcanic depressions (calderas and craters) can fill with water to form crater lakes, which often support unique ecosystems and serve as important freshwater sources.
5. Geothermal Features (Geysers and Hot Springs)
Interaction of groundwater with hot igneous rock or deeper magma heats water to produce geysers, fumaroles, and hot springs. These features support geothermal energy production and tourism.
CARE MCQ
Q. Consider the following statements:
- Active volcanoes are mainly concentrated in the Pacific Ring of Fire.
- Shield volcanoes erupt highly explosive, viscous magma.
- Composite volcanoes form from repeated explosive eruptions of ash and lava.
- Flood basalt provinces are created by very fluid lava spreading over large areas.
How many of the above statements are correct?
(a) Only one
(b) Only two
(c) Only three
(d) All four
Correct Answer: (c) Only three