Figure 5 | Scientific Reports

Figure 5

From: Volume unbalance on the 2016 Amatrice - Norcia (Central Italy) seismic sequence and insights on normal fault earthquake mechanism

Figure 5

(A) Map showing the cumulated displacements occurred from September 2015 and November 9, 2016. It is recorded by the ALOS2 DInSAR data, showing the areas collapsed and uplifted during the seismic sequence between Mw 6.0 August 24th and Mw 6.5 October 30th 2016 assuming that no pre-seismic deformation occurred. Coseismic uplift is marginal with respect to subsidence. The largest deformation is concentrated in the hangingwall of the master WSW-dipping normal fault system. Maximum coseismic subsidence was around 100 cm, whereas the highest uplift in the hangingwall (i.e., to the west) was about 10–12 cm. The estimated collapsed volume is 0.12 km3. The uplifted volume in the hangingwall is about 7.5 times smaller, posing the question of the unbalance of the volumes. According to error estimates (see method section), the values ranging between −3 and 3 cm are masked out. The dashed black and magenta polygons refer to the areas selected for subsided and uplifted volume calculation, respectively, reported in Supplementary Information Tables S1 and S2. (B,C) are 3D views of the vertical deformation map (A). The vertical exaggeration is 5000 times. The grey areas refer to the masked-out deformation values ranging between −3 cm and 3 cm (see main text), and colour code is equal to 2D map in (A). The subsided volume has a depocenter in the center of the asymmetric graben. The subsided volume is much larger than the uplifted one.

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