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Fig. 2. | Earth, Planets and Space

Fig. 2.

From: P-wave velocity structure in the southernmost source region of the 2011 Tohoku earthquakes, off the Boso Peninsula, deduced by an ocean bottom seismographic survey

Fig. 2.

(a) Observed airgun data recorded on the vertical component of OBS67. The vertical axis is the travel time reduced by 8 km/s. A band-pass filter (5–15 Hz) was applied to the observed data. Each trace is normalized to its maximum amplitude. (b) Observed explosive data recorded on the vertical component of OBS67. A band-pass filter (3–8 Hz) was applied to the observed data. Each trace is normalized to its maximum amplitude. (c) Synthetic seismograms estimated from the final model using the ray theory. (d) Observed explosive data and the estimated travel time from the final velocity model. Red solid triangles denote the estimated travel time. (e) Ray diagram calculated using the final velocity model. The vertical axis is the depth from the sea level. The horizontal axes indicate the offset distance in kilometers between the OBS and shots. Its deployed position is indicated in Fig. 1.

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