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Earth, Planets and Space
Fig. 6. | Earth, Planets and Space

Fig. 6.

From: Deep structure of the Ou mountain range strain concentration zone and the focal area of the 2008 Iwate-Miyagi Nairiku earthquake, NE Japan—seismogenesis related with magma and crustal fluid

Fig. 6.

Comparison of the spatial distribution of shallow seismicity and lower crustal structure. (a) Epicenter of shallow seismicity (depth <45 km) is denoted by a small cross. The blue rectangle shows the horizontal projection of the plausible fault of the earthquake with a magnitude >5.5 (bold line denotes the shallower edge of the fault). The aftershocks of these earthquakes are shown by small gray crosses (Umino et al., 2000). Red triangles and bold red lines (boxes) denote quaternary volcanoes and active faults, respectively. White star and small circles denote the mainshock and the aftershocks of the 2008 earthquake, respectively. (b) V s perturbation at a depth of 24 km. The white cross denotes the low-frequency micro-earthquakes.

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