[S-SS07] [EE] 地表地震断層の調査・分析・災害評価

[SSS07-P05] Rupture features of the 2016 Mw6.2 Norcia earthquake and its possible relationship with strong seismic hazards

*Chengli LIU¹、Yong ZHENG^1,2、Zujun XIE²、Xiong XIONG² (1.Hubei Subsurface Multi-Scale Imaging Key Laboratory, Institute of Geophysics and Geomatics, China University of Geosciences、2.State Key Laboratory of Geodesy and Earth’s Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences)

キーワード：Norcia earthquake, Rupture features, Joint inversion, Seismic hazards

For analyzing possible reasons for the heavy damage and seismogenic features of the 24 August 2016 Norcia earthquake, we constructed and analyzed its rupture process by incorporating datasets of near-field strong motion, teleseismic and static GPS displacements. The optimized model revealed a relatively compact slip pattern with mainly normal fault components. The maximum slip was around 0.9 m, while the rupture areas extended ~11 km and ~20 km along dip and strike, respectively. The total seismic moment was 2.3×10¹⁸ Nm, equivalent to Mw 6.2. Most seismic moments were released within 10 s, radiating 3.5×10¹³ J of seismic energy. The rupture history showed asymmetric propagation and is characterized by a relatively high rupture velocity within the first 6 s with a maximum of ~3.2 km/s. The mainshock slip pattern correlated well with the aftershocks distribution, and most of the accumulated strain was released in the east of seismic gap between the nearby 1997 and 2009 earthquake sequences.