Earthquake Damage Prevention Through Carbon Fiber Reinforcement
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Remembering the 50th Anniversary of the Great Alaskan Earthquake

This year, we commemorate the 50th anniversary of one of the most powerful earthquakes in history—the Great Alaskan Earthquake. With a moment magnitude of 9.2, it ranks as the second strongest earthquake ever recorded. The quake struck on March 27, 1964, and lasted an astonishing 4 minutes and 38 seconds. Its force was so great that it caused massive ground fissures, collapsed buildings, and triggered a deadly tsunami that took the lives of 131 people. Anchorage, just 75 miles away, suffered extensive damage, including the destruction of the airport control tower and runway, which forced the airport to close temporarily. Earthquakes are among the most dangerous natural disasters because they cause unpredictable and multidirectional ground movement. The longer and stronger the shaking, the greater the risk of structural damage. Soil type also plays a major role—soft or wet soil can amplify shaking, making high-rise buildings more vulnerable to long, slow vibrations, while shorter structures face more frequent, intense shaking. To reduce these risks, building codes are regularly updated to ensure structures can withstand both compression and tension forces. This has led to important upgrades and reinforcements in many buildings across seismically active regions.

Modern Seismic Upgrades: HJ3’s Carbon Fiber Innovation

Seismic retrofitting involves various methods, from traditional steel and concrete reinforcement to strengthening beams and columns. However, a modern and lightweight alternative is HJ3's carbon fiber reinforcement system. It offers high strength without adding significant weight, making it ideal for historic or sensitive structures. One notable project involved a historic pub in Salt Lake City, Utah, where previous fire damage had weakened the masonry walls. The owner wanted to preserve the building's original charm while meeting current seismic standards. HJ3 used a translucent glass fiber system to reinforce the walls without compromising the building’s aesthetic appeal.

Seismic Reinforcement Project: Preserving History with Modern Technology

The renovation process began with careful cleaning of the interior walls using a dry ice blasting technique. After priming, the glass fiber reinforcement system was installed. The exterior underwent a similar process—abrasive blasting and power washing, followed by the application of HJ3's carbon fiber reinforcement. This approach allowed the building to meet modern safety requirements while maintaining its historical character.

Improved Strength and Seismic Compliance

Thanks to HJ3's advanced carbon and glass fiber systems, the pub’s masonry walls were significantly strengthened, both in-plane and out-of-plane. This not only brought the structure up to code but also demonstrated how modern materials can be used effectively in historical preservation. These solutions are cost-effective, often saving over 50% compared to full rebuilding or other repair options.

Embracing Seismic Preparedness with HJ3

As earthquake risks continue to grow, reinforcing your property is a smart and necessary step. HJ3’s carbon and glass fiber systems offer a reliable, durable, and affordable way to protect your building from seismic threats. Whether you're looking to upgrade an old structure or build new, HJ3 provides innovative solutions tailored to your needs. For more information or to start your own seismic preparedness journey, contact our experienced project managers today.

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The Seward Highway near Anchorage after the earthquake.
Credit: The Washington Post
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Historical Bar before renovations and repairs.
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Final product of interior glass fiber reinforcement system installation.
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Final product of exterior carbon fiber reinforcement system installation.

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