Urasoko fault 浦底断層 (Urasoko Dansō) or Urasoko fault system is a seismic fault (system) running for 39 kilometers near Tsuruga, Japan. Combined with the faults of the system, there are an additional 25 km of faults. It is notable in that it runs beneath a nuclear power plant, Tsuruga Nuclear Power Plant. It was determined that it is capable of triggering a 7.4 magnitude quake.
- "Fault under Tsuruga nuclear plant could trigger M7.4 quake: research - The Mainichi Daily News". Mdn.mainichi.jp. Retrieved 2012-03-08.