1855 Edo earthquake
|Local date||November 11, 1855|
|Areas affected||Japan, Tokyo|
The 1855 Edo earthquake (安政江戸地震 Ansei Edo Jishin), also known as the Great Ansei earthquake, was one of the major disasters of the late-Edo period. The earthquake occurred at 22:00 local time on 11 November. It had an epicenter close to Edo (now Tokyo), causing considerable damage in the Kantō region from the shaking and subsequent fires, with a death toll of 7,000–10,000 people and destroyed around 14,000 buildings. The earthquake had a magnitude of 7.0 on the surface wave magnitude scale and reached a maximum intensity of XI (Extreme) on the Mercalli intensity scale. The earthquake triggered a minor tsunami.
The Kanto area lies above a complex part of the convergent boundaries between the subducting Pacific and Philippine Sea Plates and the overriding Eurasian and North American Plates. Earthquakes with epicenters in the Kanto region may occur within the Eurasian Plate, at the Eurasaian Plate/Philippine Sea Plate interface, within the Philippine Sea Plate, at the Philippine Sea Plate/North American Plate interface (under the Sagami Trough), at the Philippine Sea Plate/Pacific Plate interface (Izu-Bonin-Mariana Arc), or within the Pacific Plate. In addition to this set of major plates it has been suggested that there is also a separate 25 km thick, 100 km wide body, a fragment of Pacific Plate lithosphere.
The cause of the 1855 earthquake is unknown; it is consistent with a rupture along the interface between the Eurasian and Philippine Sea Plates, adjacent to, and down dip from, the rupture that caused the 1923 Great Kantō earthquake.
Two days after the earthquake, prints began to appear, with more than 400 different types being available in the following weeks. Most of the prints depicted giant catfish, a type of image known as Namazu-e. The significance being that earthquakes at the time were popularly attributed to the thrashing about of a mythological catfish under the earth, normally kept under control by the deity Kashima using a large rock. The number of prints produced during the 1855 earthquake was unprecedented and has been related to the political and social effects of the disaster. The prints show the people's anger with Kashima who became replaced by the solar deity Amaterasu. Some of the prints also depict the redistribution of wealth. The earthquake has been described as an act of yonaoshi or 'world rectification', in the light of the two great earthquakes of 1854 and the arrival of Perry's Black Ships in 1853.
Era of disaster
Three large earthquakes, the 1854 Ansei-Tōkai earthquake, 1854 Ansei-Nankai earthquake, and the 1855 Ansei Edo earthquake are collectively called the Ansei great earthquakes (安政の大地震, Ansei no Dai Jishin). Combining the effects of these disasters with a major cholera outbreak killing over 100,000 people, a fire at Edo Castle, and the 1858 Hietsu earthquake, the Ansei era was one of quite catastrophic upheaval. Due to the cumulative effects of these disasters, the reign name was changed in 1860 to usher in a 'clean slate' and better "fortune".
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- Gregory Smits. Seismic Japan: The Long History and Continuing Legacy of the Ansei Edo Earthquake Link label. Honolulu: University of Hawai'i Press, 2013. ISBN 978-0-8248-3817-1.