22-kyr-Long Record of Surface Faulting Along the Source of the 30 October 2016 Earthquake (Central Apennines, Italy), From Integrated Paleoseismic Data Sets
22-kyr-Long Record of Surface Faulting Along the Source of the 30 October 2016 Earthquake (Central Apennines, Italy), From Integrated Paleoseismic Data Sets
复制标题
DOI：
10.1029/2019jb017757
复制
发表时间：
2019-08-01
影响因子：
3.9
通讯作者：
Brunori, C. A.
中科院分区：
文献类型：
--
作者：
Cinti, F. R.;De Martini, P. M.;Brunori, C. A.
我们整合了沿维特尔山的古地震数据集。在2016年10月30日的诺尔恰地震中，地表上方的正常断层系统破裂。通过对新海沟的分析和对已有资料的回顾，我们将沿反断层带和合成断层带的海沟点之间的事件联系起来。在过去的22年中，包括2016年在内，我们发现了7次m6.5, 2016年norcia型（或更大）地表断裂事件。在2016年之前，在过去两千年（公元260-575年）发生了一次事件，可能与公元443年或484/508年破坏罗马的事件相对应。之前的三次事件发生在公元前10590年至415年之间，而最古老的两次事件发生在公元前19820年至16540年之间。近22 kyr的平均重现时间为3360 ~ 3640年，近4 kyr的平均重现时间为1220 ~ 1970年。我们推断，在维特托尔山中部的主断层上，最小的倾滑速率为0.26-0.38 mm/年。高于正常断层系统，最南端的倾滑率至少为0.10 mm/年。我们推断，所调查的岩屑的长期陡崖是在中晚更新世开始的。滑移率的沿向变化较好地再现了2016年的地表滑移趋势；因此，暴露在海沟中的时间窗代表了当前断层的活动。基于沟槽数据，还应考虑不同的地震破裂情景进行局部灾害评估。
We integrate paleoseismic data sets along the Mt. Vettore-Mt. Bove normal fault system rupturing at the surface in the 30 October 2016 Norcia earthquake. Through the analysis of new trenches from this work and a review of the preexisting data, we correlate events among trench sites along antithetic and synthetic fault splays. We recognize seven M 6.5, 2016 Norcia-type (or larger) surface-faulting events in the last similar to 22 kyr, including 2016. Before 2016, one event occurred in the past two millennia (260-575 CE) and possibly corresponds to the event damaging Rome in 443 or 484/508 CE. Three previous events occurred between 10590 and 415 BCE, whereas the two oldest ones date between 19820 and 16540 BCE. The average recurrence time is 3,360-3,640 years for the last similar to 22 kyr and 1,220-1,970 years for the last similar to 4 kyr. We infer a minimum dip-slip rate of 0.26-0.38 mm/year on the master fault in the central portion of the Mt. Vettore-Mt. Bove normal fault system and a dip-slip rate of at least 0.10 mm/year on the southernmost portion. We infer a Middle-Late Pleistocene inception of the long-term scarp of the investigated splays. The along-strike variation of slip rates well reproduces the trend of the 2016 surface slip; thus, the time window exposed in the trenches is representative for the present fault activity. Based on trenching data, different earthquake rupture scenarios should be also considered for local hazard assessment.