Palaeoseismology of the L'Aquila faults (central Italy, 2009, Mw 6.3 earthquake): implications for active fault linkage
Palaeoseismology of the L'Aquila faults (central Italy, 2009, Mw 6.3 earthquake): implications for active fault linkage
复制标题
拉奎拉断层的古地震学（意大利中部，2009 年，Mw 6.3 地震）：对活动断层连锁的影响
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
G. M. Zuppi
中科院分区：
文献类型：
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作者：
P. Galli;B. Giaccio;P. Messina;E. Peronace;G. M. Zuppi
总结
与2009年4月拉奎拉6.3级地震有关的紧急城市规划问题促使立即在与阿泰诺河谷接壤的活动断层上挖掘古地震沟槽;即Mt. 马林山Pettino和Paganica断层。通过放射性碳年龄和考古学限制加强的现有和新沟槽之间的横向相关性明确表明，这三个调查结构自末次盛冰期以来一直活跃，如影响整个斜坡/冲积沉积序列的公制偏移所示。此外，与18世纪的记载和以前的古地震学数据相一致，我们现在可以肯定，这些断层是造成1703年2月2日灾难性地震（Mw 6.7）的原因。这些数据表明，帕加尼卡-圣德梅特里奥断层系统在过去已经破裂，与相连的山。佩蒂诺山海洋断裂系统，沿着30多公里，并造成Mw6.7地震，并在其本身，沿着约。 19公里，与最近的2009年事件和类似的1461 AD事件一样。拉奎拉断层的这种行为在地震危险性评估方面具有重要意义，同时也为这些拉奎拉断层之间正在进行的断层连接过程提供了新的线索。
SUMMARY
Urgent urban-planning problems related to the 2009 April, Mw 6.3, L’Aquila earthquake prompted immediate excavation of palaeoseismological trenches across the active faults bordering the Aterno river valley; namely, the Mt. Marine, Mt. Pettino and Paganica faults. Cross-cutting correlations amongst existing and new trenches that were strengthened by radiocarbon ages and archaeological constraints show unambiguously that these three investigated structures have been active since the Last Glacial Maximum period, as seen by the metric offset that affected the whole slope/alluvial sedimentary succession up to the historical deposits. Moreover, in agreement with both 18th century accounts and previous palaeoseismological data, we can affirm now that these faults were responsible for the catastrophic 1703 February 2, earthquake (Mw 6.7). The data indicate that the Paganica–San Demetrio fault system has ruptured in the past both together with the conterminous Mt. Pettino–Mt. Marine fault system, along more than 30 km and causing an Mw 6.7 earthquake, and on its own, along ca. 19 km, as in the recent 2009 event and in the similar 1461 AD event. This behaviour of the L’Aquila faults has important implications in terms of seismic hazard assessment, while it also casts new light on the ongoing fault linkage processes amongst these L’Aquila faults.