Underground steel pipelines generally perform well in earthquakes. The greatest threats to Pacific Connector in the event of an earthquake include faults, unstable soils or certain types of land movement. Pacific Connector’s routing and construction are designed to avoid and mitigate these potential threats.
Tsunami modeling studies have been done for the Haynes Inlet which conservatively predicts up to 3 feet of temporary scour along that route during a magnitude 8.7 tsunami event. Pacific Connector will install the pipeline across the Haynes Inlet utilizing horizontal directional drills, which will result in the pipeline being installed dozens of feet below the 3-foot temporary scour depth.