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Earth, Planets and Space
Fig. 10 | Earth, Planets and Space

Fig. 10

From: Deep crustal structure around the Atotsugawa fault system, central Japan: A weak zone below the seismogenic zone and its role in earthquake generation

Fig. 10

Comparison of observed P- and S-wave velocities with experimental velocities from Nishimoto et al. (2008). Red and blue crosses denote the observed P- and S-wave velocities beneath the Atotsugawa fault system (velocities at grid nodes within 10 km of the surface trace of the Atotsugawa fault) and the NKTZ (velocities at grid nodes located below the NKTZ), respectively. An average P- and S-wave velocity for each region is shown by a colored square with error bars of one standard deviation. For comparison, an average P- and S-wave velocity outside the NKTZ estimated by Nakajima and Hasegawa (2007a) is indicated by a green square. Seismic velocities at grid nodes less than 20 km from active volcanoes were not used for calculation. Orange and gray symbols show P- and S-wave velocities of five rocks measured by Nishimoto et al. (2008) at a temperature of 740°C and a pressure of 0.8 GPa. Shaded areas denote the range of seismic velocities explained by the existence of aqueous fluids based on the theory of Takei (2002).

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