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

ABSTRACT: We analyse the M_w 6.5, 2016 Amatrice-Norcia (Central Italy) seismic sequence by means of InSAR, GPS, seismological and geologic data. The >1000 km² area affected by deformation is involving a volume of about 6000 km³ and the relocated seismicity is widely distributed in the hangingwall of the master fault system and the conjugate antithetic faults. Noteworthy, the coseismically subsided hangingwall volume is about 0.12 km³, whereas the uplifted adjacent volumes uplifted only 0.016 km³. Therefore, the subsided volume was about 7.5 times larger than the uplifted one. The coseismic motion requires equivalent volume at depth absorbing the hangingwall downward movement. This unbalance regularly occurs in normal fault-related earthquakes and

SUBMITTER: Bignami C 

PROVIDER: S-EPMC6414550 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature