Figure 7 | Scientific Reports

Figure 7

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

Figure 7

During the 2016–2017 Amatrice-Norcia sequence, the subsided volume (A) was about 7.5 times larger than the uplifted volume (B). This volume unbalance can be explained either by an elastically stretched crust or alternatively permeated by a large number of fractures formed during the interseismic period in the brittle upper crust. This would require the existence at depth of a dilated volume able to accommodate the fall of the normal fault hangingwall. The collapse of the overlying prismatic volume may be triggered by the final loss of strength in the dilated wedge and along the fault.

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