Tintina Fault in Yukon Poses Significant Earthquake Risk

The Tintina Fault, first identified in 1912, has been largely overlooked due to its slow movement and lack of monitoring instruments. Recent studies using high-resolution topographic data, including satellite and drone-based mapping techniques, have revealed significant geological shifts, indicating a history of powerful earthquakes. Researchers have found that geological formations have shifted sideways by approximately 1,000 meters (2.6 million years old) and 75 meters (132,000 years old). This suggests that the fault is in a late stage of a seismic cycle, accumulating energy for its next rupture. A surface rupture along the Tintina Fault could damage critical infrastructure like the Klondike and Dempster highways, potentially isolating communities. Landslides could also worsen due to geological events caused by shifting formations. The absence of this fault in official hazard models, including the USGS’s 2024 Alaska model, raises concerns about preparedness and risk assessment.

Research suggests it could be as large as magnitude 7.5 or greater.

Alaska, British Columbia, Alberta, and Montana are potentially at risk.

It moves slowly, and there are few instruments to detect earthquakes.

Damage to highways, pipelines, and infrastructure, as well as landslides.

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