A seismic event would be the initial alert in Tofino, British Columbia, rather than the typical sirens. Tsunami waves reaching heights comparable to a five-story building could swiftly approach the renowned beaches that attract numerous tourists to the area each summer. A recent study examining the earthquake and tsunami risks along the Cascadia Subduction Zone has highlighted the significant challenge faced by one of Vancouver Island’s well-known coastal towns. The study raises the complex issue of how a small community can adequately prepare for a potential disaster that might not occur for many years but could swiftly overwhelm the area.
The research indicates that a substantial earthquake along the Cascadia Subduction Zone could subject a considerable portion of Tofino to tsunami inundation, resulting in severe structural damage and endangering hundreds of lives, particularly during peak tourist seasons when the town’s population surges beyond its usual residents. Katsu Goda, the study’s author and an associate professor of earth sciences at Western University, emphasized that the intention is not to instill fear but rather to highlight the existing risks before they materialize.
Tofino, being situated directly on the Pacific coast, faces heightened tsunami threats due to its proximity to the ocean. The majority of its campgrounds, resort hotels, and other key establishments are located in low-lying areas, significantly elevating the town’s vulnerability. The Cascadia Subduction Zone extends from northern Vancouver Island to Northern California and experienced its last major rupture in 1700, triggering a devastating tsunami that impacted coastal Indigenous communities and even reached Japan.
Goda’s study explores extreme earthquake and tsunami scenarios along the Cascadia Subduction Zone, with magnitudes ranging from 8.7 to 9.1. It estimates that roughly half of Tofino’s structures are susceptible to tsunami inundation, with most buildings expected to collapse or be washed away if exposed to over three meters of water. The potential direct property losses from extensive damage resulting from a significant Cascadia event could exceed $1 billion, considering Tofino’s building assets valued at approximately $2.27 billion.
Vertical evacuation strategies are being considered for Tofino to provide alternative options for individuals to seek safety above tsunami flood levels when natural high ground is unreachable within a short timeframe. The study emphasizes the importance of community-level risk assessments to guide local authorities and residents in understanding where the impacts could be most severe, ultimately aiming to enhance preparedness for potential future events.
