Table 4 Slip tendency (ST) for 1998 Shizukuishi and 2008 Iwate-Miyagi Nairiku 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 |
|---|---|---|---|---|---|
Shizukuishi earthquake | F-net | East | 9-Area A–I | 0.884 | 0.792 < \(Ts\)  < 0.895 |
West | 1997–2011 | 0.885 | 0.883 < \(Ts\)  < 0.885 | ||
East | 9–Area A–II | 0.697 | 0.576 < \(Ts\)  < 0.752 | ||
West | 2011–2019 | 0.839 | 0.589 < \(Ts\)  < 0.980 | ||
East | 9–Area A–All | 0.744 | 0.585 < \(Ts\)  < 0.791 | ||
West | 1997–2019 | 0.891 | 0.572 < \(Ts\)  < 0.998 | ||
East | 9–Area B–I | 0.733 | 0.246 < \(Ts\)  < 0.968 | ||
West | 1997–2011 | 0.650 | 0.375 < \(Ts\)  < 0.770 | ||
East | 9–Area B–II 2011–2019 | 0.746 | 0.692 < \(Ts\)  < 0.772 | ||
West | 0.774 | 0.463 < \(Ts\)  < 0.956 | |||
East | 9–Area B–All 1997–2019 | 0.724 | 0.567 < \(Ts\)  < 0.825 | ||
West | 0.786 | 0.491 < \(Ts\)  < 0.999 | |||
Iwate-Miyagi Nairiku earthquake | F-net | East | 10–F–IM–I 1997–2008 (F-net) | 0.955 | 0.949 < \(Ts\)  < 0.963 |
West | 0.704 | 0.685 < \(Ts\)  < 0.724 | |||
East | 10–F–IM–II 2008–2011 (F-net) | 0.967 | 0.967 < \(Ts\)  < 0.968 | ||
West | 0.679 | 0.678 < \(Ts\)  < 0.686 | |||
East | 10–F–IM–III 2011–2019 (F-net) | 0.813 | 0.732 < \(Ts\)  < 0.910 | ||
West | 0.578 | 0.356 < \(Ts\)  < 0.662 | |||
East | 10–F + P–IM–I 1997–2008 (F-net and P wave polarity) | 0.876 | 0.784 < \(Ts\)  < 0.982 | ||
West | 0.660 | 0.636 < \(Ts\)  < 0.676 | |||
East | 10–F + P–IM–II 2008–2011 (F-net and P wave polarity) | 0.949 | 0.942 < \(Ts\)  < 0.960 | ||
West | 0.707 | 0.704 < \(Ts\)  < 0.710 | |||
East | 10–F + P–IM–III 2011–2019 (F-net and P wave polarity) | 0.865 | 0.823 < \(Ts\)  < 0.952 | ||
West | 0.540 | 0.527 < \(Ts\)  < 0.622 |