Ryōunkaku Ryōunkaku The was Japan's first western-style skyscraper. It stood in the Asakusa district of City of Tokyo (now Taitō, Tokyo) from 1890 until its demolition following the Great Kanto earthquake of 1923. The , as it was affectionately called by Tokyoites, was Tokyo's most popular attraction, and a showcase for new technologies. It housed Japan's first electric elevator. The Ryōunkaku quickly became a landmark and symbol of Asakusa after its opening in 1890. It was a major leisure complex for visitors from all over Tokyo. When the 1894 tremor weakened the structure, it was reinforced with steel girders. However, the
2011 Tōhoku earthquake and tsunami and south. From the averaged coupling coefficient of 0.5–0.8 in the source area and the seismic moment, it was estimated that the slip deficit of this earthquake was accumulated over a period of 260–880 years, which is consistent with the recurrence interval of such great earthquakes estimated from the tsunami deposit data. The seismic moment of this earthquake accounts for about 93% of the estimated cumulative moment from 1926 to March 2011. Hence, earthquakes with magnitudes about 7 since 1926 in this area only had released part of the accumulated energy. In the area near the trench, the coupling coefficient