The 1923 Great Kanto earthquake strucks with magnitude of 7.9 the Kanto Plain on the Japanese main island of Honshuu. The earthquake is an event takes place in the movie The Wind Rises written and directed by Hayao Miyazaki of Studio Ghibli.
When Jiro Horikoshi is traveling by train, the earthquake roars and the train gets suddenly derailed. Tokyo burns in flames. Jiro finds Naoko Satomi safe and sound. But her friend Kinu broke her leg. Jiro splints her leg by using his slide rule and help her to get to Ueno, where Naoko lives. Then, he is leaving without giving his name.
See also wikipedia:1923 Great Kantō earthquake.