The Tamagawa River, which divides the two prefectures of which Tokyo and Yokohama are the principal cities, formed also the dividing line between the two distinct phases of the disaster. Behind us, Tokyo suffered shocks of far less severity than those which devastated Yokohama, the principal damage being wrought by the fires which, immediately following it, swept devouringly through the capital. Yokohama, on the other hand, was smashed, utterly ruined by the shock. The flames merely reduced ruins to ashes, brought death to those who had been wounded or lay pinned under debris. Throughout the entire stricken area strange pranks of the quake had left some localities relatively unpunished, while others, scattered among the former, were flattened and shattered. It seemed as if the movement must be wave-like, smiting with greatest force the points touched by the crests of its billows.

The massive buttresses supporting the railroad bridge across the Tamagawa had been twisted, rocked out of place, and the tracks hung fantastically suspended between them. Oddly, a slight foot-bridge, formed by two widths of boards, was almost intact. We hurried across, the one thought in control being: what if another shock should catch us while on this bridge?

We had to jump from the bridge to the embankment. It had sunk, split, and shattered, one set of twisted tracks being more than six feet above the other.

— Henry W. Kinney, Earthquake Days, The Atlantic, 1924, (via)