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Table 6 Inverted principal stress axis directions of the northern Osaka area from the aftershock mechanisms (method by Michael 1984)

From: Seismotectonics of the 2018 northern Osaka M6.1 earthquake and its aftershocks: joint movements on strike-slip and reverse faults in inland Japan

R = 0.9 σ 1 σ 2 σ 3
Azimuth 106° 215° 10°
Plunge 11° 59° 29°
Error 66° 66°
  1. R is the shape ratio of principal stress axes defined by Gephart and Forsyth (1984). As the error, we use 99% quantile of the angle between the inverted axis vector and all random realizations (inverse cosine of dot product)