Table 5 Slip tendency (ST) for 2003 Miyagi and 2016 Oshika Peninsula earthquakes calculated using focal mechanism
From: Stress field in northeastern Japan and its relationship with faults of recent earthquakes
Events | Fault model | Dip direction | Stress field | \(Ts\) best | \(Ts\) error |
|---|---|---|---|---|---|
Northern Miyagi earthquake mainshock | F-net | East | 11–Area All–I | 0.960 | 0.959 < \(Ts\)  < 0.962 |
West | 1997–2011 | 0.717 | 0.717 < \(Ts\)  < 0.725 | ||
East | 11–Area All–II | 0.790 | 0.732 < \(Ts\)  < 0.888 | ||
West | 2011–2019 | 0.380 | 0.352 < \(Ts\)  < 0.884 | ||
East | 11–Area All–All | 0.975 | 0.971 < \(Ts\)  < 0.980 | ||
West | 1997–2019 | 0.672 | 0.672 < \(Ts\)  < 0.687 | ||
East | 11–South | 0.981 | 0.980 < \(Ts\)  < 0.986 | ||
West | 1997–2011 | 0.639 | 0.638 < \(Ts\)  < 0.645 | ||
Largest foreshock | F-net | East | 11–Middle | 0.950 | 0.946 < \(Ts\)  < 0.964 |
West | 1997–2011 | 0.673 | 0.673 < \(Ts\)  < 0.771 | ||
Largest aftershock | F-net | East | 11–North | 0.508 | 0.506 < \(Ts\)  < 0.869 |
West | 1997–2011 | 0.981 | 0.981 < \(Ts\)  < 0.982 | ||
Oshika peninsula earthquake | F-net | SE | 8–F + P | 0.887 | 0.881 < \(Ts\)  < 0.895 |
NE | (F-net and P wave polarity) | 0.824 | 0.824 < \(Ts\)  < 0.824 | ||
SE | 8–P | 0.877 | 0.863 < \(Ts\)  < 0.893 | ||
NE | (P wave polarity) | 0.812 | 0.805 < \(Ts\)  < 0.819 |