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Earth, Planets and Space
Fig. 12 | Earth, Planets and Space

Fig. 12

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. 12

Schematic interpretation of velocity heterogeneity along the Atotsugawa fault. Gray and white circles denote small earthquakes and low-frequency earthquakes, respectively. The estimated fluid fraction (ø) are shown for pyroxene amphibolite and for hornblende-pyroxene gabbro (in parentheses). Note that volume fractions of aqueous fluids for the horizontally isolated low-velocity zone in the upper crust beneath the central section are estimated to be 0.2–0.3%.

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