Updated tsunami inundation maps for Seward and northern Resurrection Bay, Alaska, Report of Investigation 2022-3, updates the previous tsunami hazard assessment for Seward, Alaska by numerically modeling the extent of inundation from tsunami waves generated by hypothetical earthquakes. We define an updated suite of earthquakes-including Tohoku-style megathrust ruptures and complex splay faulting in the upper North American plate from Kodiak Island and Prince William Sound-to calculate vertical seafloor displacements and model resulting tsunami dynamics in Resurrection Bay. A hypothetical earthquake with maximum slip distributed between depths of 0 and 18 km (11.2 mi) results in 'worst case' tsunami inundation for Seward. The maximum predicted overland flow depths in the community range from 10 to 25 m (33 to 82 ft), and the currents in community harbors could be as strong as 25 m/sec (48.6 knots). Dangerous wave activity is expected to last for at least 12 hours after the hypothetical worst-case earthquakes. Results presented here are intended to provide guidance to local emergency management agencies for tsunami inundation assessment, evacuation planning, and public education to mitigate future tsunami damage. This report updates the previous assessment of tsunami hazard for Seward published in 2010. The complete report and digital data are available from the DGGS website: http://doi.org/10.14509/30893.