Figure F8. Locations of very low frequency earthquakes in the Nankai Trough in 2003–2004 (Obara and Ito, 2005). The events ranged in magnitude from 3.5 to 4.4 and were characterized by dominantly low frequency (10 s period) energy, with essentially no higher frequency component (Obara and Ito, 2005; Ito and Obara, 2006). Focal mechanisms and locations for the events off the Kii Peninsula are consistent with reverse faulting within the accretionary wedge. White circles = proposed drilling locations.
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