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Fig. 5 | Earth, Planets and Space

Fig. 5

From: Double seismic zone within the ridge-shaped slab beneath southwest Japan

Fig. 5

Example of seismograms of intra-slab earthquakes observed at several Hi-net stations. (a) Seismograms of an M 4.1 event occurring at a depth of 38.3 km on February 7, 2003. The reduction velocity is 8.0 km/s. Arrows mark the arrivals of distinct seismic phases. P n , S n , P, and S indicate oceanic P n wave, oceanic, S n wave, P direct wave, and S direct wave, respectively. The distribution of the recording seismic stations and the focal mechanism of the event are also shown. (b) Seismograms of an M 3.0 event (event f in Figs. 3 and 4) occurred at a depth of 44.6 km on April 17, 2004. Other explanations are the same as for (a).

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