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Exposing Volcanic Layers with Tephra and Concrete in a Geological Observatory

Author:
Bart Bliek
Exposing Volcanic Layers with Tephra and Concrete in a Geological Observatory
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Constructed from locally sourced tephra and concrete, the observatory exposes volcanic layers while providing an educational platform for visitors to engage with the geological history of Hverfjall.
5 key facts about this project
01
Constructed with locally sourced tephra, integrating the structure with its geological context.
02
The observatory exposes multiple layers of volcanic deposits for direct public engagement.
03
A prefabricated approach minimizes construction impact on the surrounding landscape.
04
The design features a combination of organic shapes and precision-cut stainless steel elements.
05
Visitors can ascend the structure to obtain panoramic views of the Hverfjall crater.

The Hverfjall Geological Observatory is located in Iceland, specifically within the Hverfjall tuff ring. It aims to improve the experience for visitors by providing a large-scale stratigraph that allows direct interaction with the geological layers of the area. The design concept focuses on making complex geological information accessible through a three-dimensional structure. This not only serves an educational role but also fosters a stronger connection to the volcanic history that shapes the landscape.

Design Concept and Form

The observatory features an organic form that stands in contrast to a ribbon made of precision-cut stainless steel that wraps around it. This combination emphasizes the relationship between natural formations and human-made structures. The ribbon draws attention along the ridge and creates a visual link between the colors of the earth and the sky. This attention to form enhances the overall experience for visitors engaging with the site.

Geological Context

Understanding the geological background of Hverfjall is essential to the overall design. The volcanic activity comes from an eruptive fissure in the Kafra volcanic system. This has led to both pyroclastic deposits and solidified lava flows. By exposing these layers within the structure, the observatory allows visitors to connect more deeply with the earth's dynamic processes, helping them appreciate the forces that shape the environment.

Materials and Construction

The design incorporates prefabrication to streamline construction processes. The observatory will be built in segments and placed on a submerged concrete foundation pad to minimize impact on the surrounding area. Concrete, mixed with locally sourced tephra, is the primary building material, linking the structure to its geological surroundings. Furthermore, galvanized steel will be used for the staircase, providing durability, while stainless steel panels will be employed for cladding, ensuring resilience against the harsh conditions.

Attention to Detail

Every part of the observatory is designed to enhance the visitor's experience with the volcanic landscape. The careful layering of materials and the contrast between different forms reflect the relationship between human experience and natural forces. As visitors move through the structure, they engage with the geological story of Hverfjall, allowing for a meaningful connection with the land and its history.

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The Buildner’s Unbuilt Award 2025: Celebrating Architectural Creativity and Visionary Unbuilt Designs with a Total Prize Fund of €100,000

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The Buildner’s Unbuilt Award 2025 is an international architecture competition dedicated to recognizing and celebrating the value of unrealized architectural designs. It invites architects, designers, and students worldwide to submit visionary projects that have not yet been constructed, highlighting the power of ideas and the creativity behind the design process. By focusing on unbuilt work, the competition aims to bring forward concepts that shape the future of architecture and push the boundaries of the profession. 

Participants can compete in three categories based on project scale: Small Wonders (up to 100 m²), Medium Marvels (101–999 m²), and Large Visions (over 1,000 m²). Each category winner will receive €20,000, and additional prizes include honorable mentions, student awards, and a special Best Presentation Award. Winning projects will gain significant international exposure through Buildner’s publicity campaign and a feature article on ArchDaily, providing a unique opportunity to showcase creative ideas to a global audience. 

The Buildner’s Unbuilt Award 2025 encourages entrants to submit any type of unbuilt project, from conceptual visions to detailed designs, celebrating bold innovation without the constraints of realization. Important deadlines: registration closes on October 30, 2025; submissions are due by November 20, 2025; winners will be announced on December 17, 2025.

Buildner's Unbuilt Award 2025

Celebrating your unbuilt architecture visions with a €100,000 prize

100,000€ Prize / 2025 ideas COMPETITION
Prize 100,000 €
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Final registration deadline 30 October 2025

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