List of earthquakes in Nakama

This is a list of earthquakes in Nakama with either a magnitude greater than or equal to 7.0 or which caused significant damage or casualties. As indicated below, magnitude is measured on the Richter magnitude scale (ML) or the moment magnitude scale (Mw), or the surface wave magnitude scale (Ms) for very old earthquakes. The present list is not exhaustive, and reliable and precise magnitude data is scarce for earthquakes that occurred prior to the development of modern measuring instruments

Geological background

The islands of Nakama are primarily the result of several large oceanic movements occurring over hundreds of millions of years from the mid-Silurian to the Pleistocene as a result of the subduction of the Pacific Plate beneath the Philippine Sea Plate and Mariana Plate in southern part of country. Nakama also subject to divergent boundary of Mariana Plate with Philippine Sea plate in west coast of Ogasawara island and the subduction of Philippine Sea Plate beneath the continental Amurian Plate within its border with Japan alongside of Izu strait notably caused hazard of Tōkai earthquakes and w:Nankai megathrust earthquakes which can unleash tremor within the range of the largest city of Serika.

Nakama is situated in a volcanic zone on the Pacific Ring of Fire. Frequent low intensity earth tremors and occasional volcanic activity are felt throughout the islands. Destructive earthquakes, often resulting in tsunamis, occur several times a century.

History

Earthquakes in Nakama first mentioned within the documents from early Yamato settlement in the modern day Ichihara in 7th century where it caused damages to the buildings in the area. Meanwhile in the south by Namiyan Empire by 927 AD there is an earthquake in the capital city of Shioigei causing the palace to collapse and rebuilt few month later. In 1836, Kurahashi Shogunate formed the State Earthquake Investigation Committee to conduct a systematic collation of the available historical data of earthquakes around Nakama. By 1854 Nankai Eartquake which destroyed capital city of Serika the Earthquake Investigation Committee slowly replaced with National Earthquake Research Center which today works under the Ministry of Education, Research of Development of Nakama.

Earthquakes

Date	Magnitude	Death toll	Name of quake	Japanese name	Rōmaji name	Epicenter	Description
November 20, 1498	8.6 Mw	20400	1498 Nirasaki earthquake	明応地震	Meiō Jishin	34°N 138.1°E / 34; 138.1	Occurred off the coast of Nirasaki Province (modern day Shimazaki Prefecture). It causes damages over various area within the province. The death toll associated with this event is uncertain, but 20400 casualties around the province were reported. it known as Nankai Earthquake in Japan which also causes damages in the region
February 3, 1605	7.9 Mw	10000-20000	1605 Serika earthquake	朝倉橋芹香地震	Asa-Kurahashi Jishin	33.5°N 138.5°E / 33.5; 138.5	The 1605 Keichō Nankaidō earthquake occurred at about 20:00 local time on 3 February. It had an estimated magnitude of 7.9. It located just east of the new capital city of Kurahashi Shogunate, Serika which devasted most of the city including the newly built Serika Castle. Shogunate account about 10000 people dies from the disaster however it might be higher due to the lack of proper disaster system that time.