Abstract
Seismic effects and Tsunami by the 2011 off the Pacific Coast of Tohoku Earthquake caused significant damages for human resources and materials in wide areas of the east pacific region in Japan. In the present study, the discussions are devoted to the seismic safety assessment of the transmission gas pipeline based on the historical design guidelines and observed damage data.
As a results of this study,
1) A seismic safety assessment method is developed to demonstrate the resilience of the pipeline integrity survived after the 2011 Earthquake based on the actual site observations along the high pressure gas transmission pipeline and many assumptions on the statistical data of the pipeline related random variables.
2) The failure probabilities of the original and survived pipelines to be evaluated for the level 2 ground motions will be useful to investigate the risk estimation and the seismic investment for the maintenance management of the pipeline.
3) Frequent monitoring of potentially hazardous points not only in the mountain route but also in the coastal zone is recommended. Terminal facilities located at the coastal area must be protected from the tsunami hazard and also from the liquefaction hazard.
