Fig. 2: Horizontal seismograms of the Tohoku-Oki Earthquake at the selected KiK-net stations and corresponding coseismic variations of near-surface shear-wave velocity. | Nature Communications

Fig. 2: Horizontal seismograms of the Tohoku-Oki Earthquake at the selected KiK-net stations and corresponding coseismic variations of near-surface shear-wave velocity.

From: Near-surface softening and healing in eastern Honshu associated with the 2011 magnitude-9 Tohoku-Oki Earthquake

Fig. 2: Horizontal seismograms of the Tohoku-Oki Earthquake at the selected KiK-net stations and corresponding coseismic variations of near-surface shear-wave velocity.

The horizontal seismograms are obtained by rotating the north–south (NS) and east–west (EW) components from 10° to 180° in 10° increments, in which the azimuth is measured clockwise from the north. Here shows the horizontal seismograms with the maximum PGA among the 18 directions. The maximum PGA is given by the tick label of the acceleration-axis, and the corresponding azimuth (θ) is listed in each subplot. The lower tick label of the velocity-change-axis (Δc/c) represents the maximum velocity reduction (by percent) during the mainshock compared with the preseismic level of the seismic velocity before the Tohoku-Oki Earthquake. The red circle indicates the initiation of the recovery process.

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