Type: World Mapping

Why in the News?

Japan’s Sakurajima volcano has erupted several times sending ash plumes up to 4.4 km into the atmosphere.

About Sakurajima Volcano:

• Location: Kagoshima Prefecture, Kyushu, sitting on the southern rim of the Aira caldera inside Kagoshima Bay.
• Geological Origin: Linked to formation of the Aira caldera (22,000–29,000 years ago); Sakurajima developed as a post-caldera cone about 13,000 years ago.
• Volcano Type: A classic stratovolcano built from alternating lava and ash layers; active vents include Minamidake crater and the Showa flank crater.
• Physical Features: Height 1,117 m, circumference ≈50 km; originally an island until 1914 lava flows connected it to the Osumi Peninsula.
• Eruption Style: Dominantly Strombolian eruptions (ash, bombs, lapilli) but historically capable of large Plinian eruptions.
• Historical Activity: Continuous eruptive record since 963 AD; major episodes in 1471–76, 1779–82, and the 1914 catastrophic eruption.
• Risk Status: Considered one of Japan’s most dangerous volcanoes due to high activity, caldera-linked magma supply and extreme proximity to inhabited zones.

What makes it unique?

• Near-Continuous Activity: Erupts hundreds of times annually, ranking among the world’s most persistently active volcanoes.
• Caldera System: Built on the Aira caldera, giving it a deep, complex, highly active magma plumbing network.
• Landform Transformation: The 1914 eruption converted Sakurajima from an island into a peninsula, an unusual event in recorded volcanology.

Why in the News?

This newscard is an excerpt from the original article published in the Indian Express.

About the Volga River:

• Overview: The longest river in Europe (about 3,500 km), originating in the Valdai Hills northwest of Moscow and flowing southeast to the Caspian Sea at Astrakhan.
• Drainage Basin: Covers around 1.35 million sq. km, among Europe’s largest river systems, with major tributaries, Kama, Oka, Vetluga, and Sura.
• Historical Role: Served as a critical front during the Battle of Stalingrad (World War II) and remains central to Russian historical and strategic narratives.
• Cultural Significance: Revered as “Mother Volga”, symbolising Russian unity, resilience, and identity, deeply embedded in folklore and national consciousness.
• Economic Importance: It contributes one-fourth of Russia’s agricultural output, supports industrial fishing, and sustains key industries, oil refining, shipbuilding, hydroelectric power.
• Navigation & Connectivity: Linked to the Baltic, Black, and Caspian Seas through an extensive network of canals and reservoirs, forming the backbone of Russia’s inland transport system.
• Urban & Industrial Corridor: Major cities like Kazan, Samara, Nizhny Novgorod, and Volgograd lie along its course, forming Russia’s industrial-agricultural heartland.
• Ecological Richness: Supports about 260 bird species and 70 fish species, making it a key biodiversity hotspot within Eurasia.