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Table 4 Major earthquakes around the Shionohara baseline and calculated baseline changes

From: Triangulation scale error caused by the 1894 Shonai earthquake: a possible cause of erroneous interpretation of seismic potential along the Japan Trench

Earthquake Magnitude (Mw) Coseismic (mm) Postseismic (mm) References
1894/10/22 Shonai * 6.8 + 50.3 − 2.5  
  7.0 + 100.5 − 4.9  
1896/6/15 Sanriku 8.5 + 3.0 + 1.1 Tanioka and Satake (1996)
1896/8/31 Rikuu 7.2 + 3.2 − 5.2 Thatcher et al. (1980)
1897/8/5 Miyagi-oki 7.7 + 1.4 + 0.6 Aida (1977)
1900/5/12 Northern Miyagi 6.2 + 0.1 + 0.1 Takemura (2005)
1933/3/3 Sanriku 8.4 − 3.5 − 3.0 Abe (1978)
1936/11/3 Miyagi-oki 7.2 + 0.6 + 0.1 Yamanaka and Kikuchi (2004)
1937/7/27 Miyagi-oki 7.1 + 0.1 0.0 Yamanaka and Kikuchi (2004)
1938/5/23–1938/11/7 Shioyazaki-oki 7.0, 7.5, 7.3,7.4, 6.9 − 0.6 − 0.4 Abe (1977)
1962/4/30 Northern Miyagi 6.2 + 0.5 + 0.6 Sato (1989)
1964/6/16 Niigata 7.6 + 8.0 + 3.0 Abe (1975)
1968/5/16 Tokachi-oki 8.2 − 0.4 − 0.5 Aida (1978)
1970/10/16 SE Akita 6.2 − 0.2 0.0 Mikumo (1974)
1978/6/12 Miyagi-oki 7.5 + 1.5 − 0.5 Seno et al. (1980)
1983/5/26 Japan Sea 7.7 − 1.1 − 0.4 Sato (1985)
2003/7/26 Northern Miyagi 6.1 + 0.1 0.0 Nishimura et al. (2003)
2005/8/16 Miyagi-oki 7.2 + 0.6 0.0 GSI (2005)
2008 Iwate-Miyagi 7.2 + 11.3 0.0 Takada et al. (2009)
  1. Postseismic changes are cumulative viscoelastic effects until 2012
  2. *Fault parameters for the 1894 Shonai earthquake are assumed as 38.75ºN, 139.95ºE, D = 0 km, L = 30 km, W = 15 km, ϕ = 0º, δ = 30º, λ = 90º, Δu = 1.5 or 3.0 m