Astari 
Aogashima is a volcanic island located approximately 358 kilometers south of Tokyo, Japan, nestled within the Philippine Sea.
It is part of the Izu archipelago, a chain of volcanic islands extending from the Izu Peninsula of Honshu.
The island covers a total area of just 5.7 km2, making it relatively small.
Nevertheless, despite its diminutive dimensions, Aogashima boasts a unique double caldera structure, formed by volcanic activity over millennia.
Within its rugged terrain lies a small village inhabited by around 170 residents, who rely on fishing, agriculture, and tourism for their livelihoods.
Moreover, beneath its surface, the island’s volcanic origins are evident, with its innermost caldera plunging to depths of over 200 meters.
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Contents
Phenomenon of Double Caldera Structure
The double caldera structure on Aogashima is formed by a series of volcanic eruptions over millennia. This geological phenomenon involves the creation of two nested calderas within the island’s terrain.
A massive eruption formed the outer caldera approximately 300,000 years ago, encircling the inner caldera, which formed around 50,000 years ago.
Steep walls and volcanic features characterize the inner caldera, which contains the island’s settlements.
This unique formation results from the collapse of the volcano’s summit following eruptions, creating concentric depressions within the landscape.
Active volcanic processes within these calderas contribute to the island’s dynamic environment, shaping its terrain and influencing its ecosystem.
Isolation and Inaccessibility of the Island
Aogashima’s isolation and inaccessibility add to its allure, making it a destination for intrepid adventurers seeking untouched natural beauty.
Surrounded by steep cliffs and accessible only by boat or helicopter, the island remains relatively untouched by modern development.
However, for those willing to make the journey, Aogashima offers a network of hiking trails that wind through dense forests and lead to panoramic viewpoints, providing stunning vistas of the island’s volcanic landscape.
These trails offer a chance to immerse oneself in the rugged terrain and discover hidden gems along the way.
Additionally, the island’s hot springs, known as “Onsen,” provide a rejuvenating retreat for weary travelers, offering relaxation amidst the remote wilderness.
Despite the challenges posed by its remote location, Aogashima beckons explorers with the promise of adventure and the opportunity to experience nature in its purest form.
The Livelihood of Residents in Aogashima
The villagers in Aogashima lead a simple yet fulfilling lifestyle, deeply connected to the land and sea that sustain them.
Fishing is a fundamental activity for many residents, with the surrounding waters providing an abundant source of seafood.
From traditional fishing methods to modern techniques, villagers rely on their skills and knowledge to harvest various fish, including tuna, bonito, and mackerel.
The catch sustains the local diet and supports the island’s economy through trade and commerce.
Agriculture is another essential aspect of life on Aogashima.
Despite the island’s rugged terrain, residents cultivate crops such as sweet potatoes, vegetables, and citrus fruits in terraced fields carved into the slopes.
Farming practices are adapted to the challenging environment, with villagers employing traditional methods passed down through generations to ensure successful harvests.
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Aogashima as an Important Bird Area (IBA)
Transitioning from the island’s rugged cliffs to its lush forests, the IBA provides crucial habitat for various bird species.
Native avian inhabitants, such as the Japanese wood pigeon and Bonin white-eye, find sanctuary within these protected areas, contributing to the island’s rich biodiversity.
Furthermore, migratory birds utilize Aogashima as a stopover during their long journeys, adding to the ecological significance of the IBA.
Conservation efforts aimed at preserving these habitats ensure the continued survival of these avian populations, underscoring the importance of Aogashima as a haven for birds in the region.