Coseismic deformation and triggered landslides of the 2016 Mw 6.2 Amatrice earthquake in Italy
Coseismic deformation and triggered landslides of the 2016 Mw 6.2 Amatrice earthquake in Italy
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DOI：
10.1002/2016gl071687
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发表时间：
2017-02
影响因子：
5.2
通讯作者：
Mong‐Han Huang;E. Fielding;C. Liang;P. Milillo;D. Bekaert;D. Dreger;Jacqueline T. Salzer
中科院分区：
文献类型：
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作者：
Mong‐Han Huang;E. Fielding;C. Liang;P. Milillo;D. Bekaert;D. Dreger;Jacqueline T. Salzer
意大利亚平宁山脉中部发生了多次中等规模但具有破坏性的浅层地震。在这项研究中，我们基于同震GPS和干涉合成孔径雷达（InSAR）优化了2016年意大利6.2 Mw阿马特里切地震的断层几何形状，并反演了断层滑动。结果表明，几乎所有的断层滑动都发生在3 ~ 6 km深度之间，但沿走向延伸20 km。在阿马特里切镇，最具破坏性的破坏发生了不到4厘米的静态地表位移。地震引起的滑坡并不罕见，但具有亚米级运动的滑坡在野外观测中具有挑战性。我们在震中西北部和东北部发现了同震触发深层滑坡的证据，其中同震峰值地面加速度估计为0.5 g。通过结合上升和下降InSAR数据，我们可以估计Monte Vettore附近和Castelluccio以西的滑坡厚度分别至少为100和80 m。Monte Vettore附近的滑坡终止于先前存在的Monte Vettore断层（MVEF）陡崖。我们的研究结果表明，基于古地震研究估计的MVEF的长期断层滑动率可能由于附近地震事件引发的滑坡而存在误差。
The Central Apennines in Italy have had multiple moderate‐size but damaging shallow earthquakes. In this study, we optimize the fault geometry and invert for fault slip based on coseismic GPS and interferometric synthetic aperture radar (InSAR) for the 2016 Mw 6.2 Amatrice earthquake in Italy. Our results show that nearly all the fault slip occurred between 3 and 6 km depth but extends 20 km along strike. There was less than 4 cm static surface displacement at the town Amatrice where the most devastating damage occurred. Landslides triggered by earthquake ground shaking are not uncommon, but triggered landslides with submeter movement are challenging to be observed in the field. We find evidence of coseismically triggered deep‐seated landslides northwest and northeast of the epicenter where coseismic peak ground acceleration was estimated >0.5 g. By combining ascending and descending InSAR data, we are able to estimate the landslide thickness as at least 100 and 80 m near Monte Vettore and west of Castelluccio, respectively. The landslide near Monte Vettore terminates on the preexisting fault Monte Vettore Fault (MVEF) scarp. Our results imply that the long‐term fault slip rate of MVEF estimated based on paleoseismic studies could potentially have errors due to triggered landslides from nearby earthquake events.