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Progress in Earth and Planetary Science
Fig. 7 | Progress in Earth and Planetary Science

Fig. 7

From: The nature of the Pacific plate as subduction inputs to the northeastern Japan arc and its implication for subduction zone processes

Fig. 7

Map of line A6 and examples of OBS record sections. Note that the amplitude of first arrivals becomes weak at offsets larger than \(\sim 20\) km at many eastern sites, such as S80 and S90, which is generally called the shadow zone and often observed in this part of the Pacific plate (e.g., Fujie et al. 2016, 2018). Such shadow zones suggest a very small or negative vertical velocity gradient within the oceanic crust (i.e., velocity reversal within the oceanic crust) (e.g., Zelt 1999). See the supplementary materials for more OBS record sections

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