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Earth, Planets and Space

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

7°

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)
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