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Earth, Planets and Space
Fig. 3 | Earth, Planets and Space

Fig. 3

From: A new seismic survey technology using underwater speaker detected a low-velocity zone near the seafloor: an implication of methane gas accumulation in Tokyo Bay

Fig. 3

Results of velocity analyses. a One-layer velocity model with 1500 m/s velocity. b Two-layer model with velocities of 1500 m/s and 1100 m/s. c Two-layer model with velocities of 1500 m/s and 1600 m/s. Based on the flatness of Ref. B and Ref. C, the low-velocity zone (LVZ) was specified immediately below Ref. A

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