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Table 1 Information of the last four historical earthquakes and tsunamis

From: Geological record of prehistoric tsunamis in Mugi town, facing the Nankai Trough, western Japan

Name of earthquake Date (CE) a Moment magnitude (Mw) Rupture zonea Coastalb, d deformation Number of tsunami monuments in Mugi Town Other descriptions in Mugi Town
Keicho 3 February1605 No data Various interpretations suggested No data No data Mantokuji temple was washed away.f (The temple sat at 3.5 m T.P.g)
Hoei 28 October1707 8.6b Z + A + B + C + D (+E?) No data No data Tsunami waves ran up three rivers.f More than 700 houses were washed away and more than 100 people died.f Mantokuji temple was washed away.f The tsunami ran up to about 1.5 km on the Uchizuma River. f,h
Ansei-Nankai 24 December1854 8.4b Z + A + B Uplift in Cape Muroto (1.2 m)Subsidence in Kochi City (1.1 m) 2 Playground and Teba Islande 640 houses were carried away and 39 people died.f The tsunami ran up to the steps of the Mantokuji temple along the Mugi River.f
Showa-Nankai 21 December1946 8.0b–8.3c A + B Uplift in Cape Shionomisaki (0.6 m) Cape Muroto (0.5–0.9 m) Subsidence in Mugi Town (0.3 m or more)
Shishikui (0.6 m)
3 Two are in a playground, and the other is in an elementary school. The whole study site was inundated.d 151 houses were washed away and 52 people died.f The western part of Mugi Bay was more strongly affected than the eastern part because the tsunami came from the east.f
  1. aFrom Sangawa (2007) and Ishibashi (2014)
  2. bFrom Usami et al. (2013)
  3. cFrom Tanioka and Satake (2001)
  4. dFrom Central Meteorological Observatory (1947)
  5. eTeba Island is located about 4 km south of Mugi Bay
  6. fFrom Editing Committee of the History of Mugi Town (1976)
  7. gFrom Murakami et al. (1996)
  8. hUchizuma River is located about 1 km west of the study site