Modeling Liquefaction-Induced Road Disruptions in Cascadia Megathrust Earthquakes: Implications for Emergency Response and Access in the U.S. Pacific Northwest

Large earthquakes along the Cascadia Subduction Zone (CSZ) are expected to trigger widespread soil liquefaction that could severely disrupt transportation systems across the U.S. Pacific Northwest. However, past regional assessments have relied on simple geologic screening methods and binomial shaking thresholds that are only loosely informed by liquefaction science This study introduces a mechanics-informed, data-driven framework for estimating liquefaction-induced road closures and service reductions following a magnitude-9 CSZ earthquake. Liquefaction hazard is mapped using a geospatial liquefaction model trained on more than 37,000 cone penetration tests and conditioned on regional datasets describing geomorphology, geology, climate, and hydrology. Predicted liquefaction severity is translated into segment-level probabilities of closure and reduced service using empirically derived fragility relationships. These probabilities are mapped at 90-m resolution across Washington, Oregon, and California and propagated through the National Highway System using a spatially correlated Monte Carlo simulation to estimate link-level disruption. Results show that impacts are concentrated in low-lying coastal zones, river valleys, and urban waterfronts, with major disruptions expected along critical routes including U.S. Route 101. Local mobility is further examined in Pacific and Grays Harbor Counties, Washington, where limited network redundancy, strong shaking, and high liquefaction susceptibility lead to elevated probabilities of isolation and loss of hospital access. Socioeconomic analysis reveals modest but statistically significant associations between road impacts and demographic indicators, suggesting that liquefaction impacts may compound with existing social vulnerabilities. While not a substitute for site-specific analysis, the results provide a regional baseline for emergency planning, risk communication, and prioritization of more advanced geotechnical sampling and analysis. Moreover, the methodology proposed here is not specific to the CSZ, but rather, could be applied to analogous studies of road impacts elsewhere.

Author dc:creator

• Smith, Olyvia

Advisors dc:contributor.advisor

• Maurer, Brett
• Wartman, Joseph

• Civil engineering

Statement dc:rights

• none

Language dc:language.iso

en_US

Handle dc:identifier.uri

https://hdl.handle.net/1773/55174

OAI identifier oai:identifier

oai:digital.lib.washington.edu:1773/55174