Canada’s Long-Dormant Tintina Fault Could Trigger Massive Earthquake After 12,000 Years

A newly published study has raised fresh concerns about the Tintina Fault—a vast but long-overlooked geological fault in Canada’s Yukon region—suggesting it could unleash a major earthquake after lying dormant for approximately 12,000 years.

Stretching roughly 620 miles (1,000 kilometers) from British Columbia through the Yukon and into Alaska, the Tintina Fault was once believed to have been inactive for more than 40 million years. However, geological evidence now points to several powerful ruptures within the last 2.6 million years, indicating its potential to generate significant seismic activity.

Researchers from the University of Victoria conducted the study, focusing on a 130-kilometer segment near Dawson City. Using high-resolution satellite-based topographic mapping, the team identified fault scarps and ground shifts—clear signs of previous seismic events etched into the rugged landscape.

Their findings, published in Geophysical Research Letters, suggest the fault could produce an earthquake with a magnitude of up to 7.5. Such an event would pose serious risks, potentially damaging key routes like the Klondike and Dempster Highways and isolating Dawson City from essential connections.

Signs from the Past

By studying displaced landforms, scientists discovered that glacial features dating back 2.6 million years had shifted laterally by about one kilometer (0.62 miles). Landforms around 132,000 years old were displaced by approximately 75 meters (246 feet). Interestingly, terrain features formed 12,000 years ago showed no visible movement—marking the period of the fault’s most recent long silence.

This extended inactivity is cause for concern, as researchers estimate the fault has accumulated roughly six meters (20 feet) of “slip deficit” since its last rupture—energy that could be released in a single, powerful event.

Lead author Theron Finley noted,

“While we’ve measured significant slip accumulation, we still don’t know the exact recurrence pattern for major earthquakes along the Tintina Fault. It could happen soon, or not for thousands of years.”

Currently, the Tintina Fault is not listed as a major hazard in Canada’s National Seismic Hazard Model. However, this research highlights the need for closer monitoring, as its unpredictable nature could make it a hidden seismic threat for the Yukon and surrounding regions.