Upper and Lower Plate Controls on the 2011 Tohoku-oki Earthquake (2 of 2) (IMAGE)
Caption
Fig. 2. East-west vertical cross-sections of Vp tomography (left) and corresponding cartoons (right) along three profiles (A) off Iwate Prefecture, (B) off Miyagi Prefecture, and (C) off Fukushima Prefecture. Normalized residual topography (blue line) and gravity (green line) are shown atop each cross-section. Red and blue colors denote low and high Vp perturbations, respectively, whose scale is shown beside (A). White bold and dashed lines denote the upper boundary of the subducting Pacific plate and the Moho discontinuity, respectively. The red star: the 2011 Tohoku-oki earthquake (Mw 9.0). Black and yellow stars denote other megathrust earthquakes (Mw 7.0~8.0) during 1917-2017 and very low frequency earthquakes (VLFEs) within a 40 km width of each profile, respectively. The reverse triangle: the Japan Trench. In the right panels, the red, green and blue lines denote low-, normal- and high-Vp anomalies atop the subducting Pacific plate, respectively. HF: high-frequency.
Credit
Dapeng Zhao
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