Table 1 Characteristics of deep and shallow slow earthquakes in Nankai (Maeda and Obara 2009; Ito et al. 2009; Takeo et al. 2010; Obara 2011; Ochi and Kato 2013; Ide and Yabe 2014; Yamashita et al. 2015, 2021, 2022; Takagi et al. 2019; Yabe et al. 2019; Baba et al. 2020a; Takemura et al. 2022b, c; Yamamoto et al. 2022a)
From: A review of shallow slow earthquakes along the Nankai Trough
| Â | Deep | Shallow |
|---|---|---|
Observed slow earthquake phenomena | LFE, tremor, VLFE, short-term SSE, long-term SSE | Tremor, VLFE, SSE |
Segmentation in Nankai | Tokai, Northern Kii, Mid. Kii, Southern Kii, Eastern Shikoku, Mid. Shikoku, Western Shikoku, Kyushu | Southeast off the Kii Peninsula, off Cape Muroto, Hyuga-nada |
Episode duration | ETS: 1–7 days L-SSE: 0.4–6 years | ETS: 1–3 months |
Recurrent interval | ETS: 70–200 days L-SSE: 2–7 years | Hyuga-nada: 2–5 years Others: 3–9 years |
Migration velocity | Main front: 10 km/day RTR: ~ 100 km/day Streak: > 50 km/h | Main front: 1–20 km/day RTR: 10–200 km/day Streak: not observed |
Scaled energy | 10–10–10–9 | Hyuga-nada: 10–11–10–8 Others: 10–9–10–8 |
Seismic productivity | Â | Â |
(MoVLFE/MoSSE) | 0.1–1% | 1–15% |