Six magnitude 5 or higher earthquakes have occurred within the Portland, OR, metropolitan area in the past 150 years. The Cascadia Subduction Zone has produced more than 40 large magnitude earthquakes in the past 10,000 years, most recently on Jan. 26, 1700 with an estimated magnitude 9. It is not a question of if Oregon will experience a catastrophic earthquake, but when it will occur. Oregon’s critical energy infrastructure (CEI) Hub is located in an area with significant seismic hazard. Significant liquid fuel, natural gas and electrical infrastructure and facilities are situated in this relatively small area in Portland. One large consumer is the Portland International Airport. Much of NW Natural’s natural gas also passes through the CEI Hub. A high voltage electrical transmission corridor crosses the area as well as supplies distribution for this area. This is the final report of an earthquake risk study on Oregon’s CEI Hub. The study focuses on a large-magnitude Cascadia earthquake which because of widespread shaking and vulnerable infrastructure poses a high risk to the health and safety of Oregonians and the region’s economy. It identifies and defines the CEI Hub area, assesses the seismic hazards and identifies the vulnerabilities of the petroleum (liquid fuel), natural gas, and electric energy facilities in the CEI Hub. Tables and figures. This is a print on demand report.