Active normal faulting along the Mt. Morrone south-western slopes (central Apennines, Italy)
| 详细信息 | 推荐本文 | |
- 作者：Stefano Gori (1) gori@mi.ingv.it
Biagio Giaccio (2) biagio.giaccio@igag.cnr.it
Fabrizio Galadini (1) galadini@mi.ingv.it
Emanuela Falcucci (1) falcucci@mi.ingv.it
Paolo Messina (2) paolo.messina@igag.cnr.it
Andrea Sposato (2) andrea.sposato@igag.cnr.it
Francesco Dramis (3) dramis@uniroma3.it - 关键词：Active fault – ; Slip rate – ; Maximum expected magnitude – ; Continental stratigraphy – ; Sulmona basin – ; Central Apennines
- 刊名：International Journal of Earth Sciences
- 出版时间：January 2011
- 出版年：2011
- 期刊代码：54_0016-7835
- 类别：ear
- 卷：100
- 期：1
- 页码：157-171
- 数据来源：sp
摘要
In the present work we analyse one of the active normal faults affecting the central Apennines, i.e. the Mt. Morrone normal fault system. This tectonic structure, which comprises two parallel, NW-SE trending fault segments, is considered as potentially responsible for earthquakes of magnitude ≥ 6.5 and its last activation probably occurred during the second century AD. Structural observations performed along the fault planes have allowed to define the mainly normal kinematics of the tectonic structure, fitting an approximately N 20掳 trending extensional deformation. Geological and geomorphological investigations performed along the whole Mt. Morrone south-western slopes permitted us to identify the displacement of alluvial fans, attributed to Middle and Late Pleistocene by means of tephro-stratigraphic analyses and geomorphological correlations with dated lacustrine sequences, along the western fault branch. This allowed to evaluate in 0.4 卤 0.07 mm/year the slip rate of this segment. On the other hand, the lack of synchronous landforms and/or deposits that can be correlated across the eastern fault segment prevented the definition of the slip rate related to this fault branch. Nevertheless, basing on a critical review of the available literature dealing with normal fault systems evolution, we hypothesised a total slip rate of the fault system in the range of 0.4 卤 0.07 to 0.8 卤 0.09 mm/year. Moreover, basing on the length at surface of the Mt. Morrone fault system (i.e. 22–23 km) we estimated the maximum expected magnitude of an earthquake that might originate along this tectonic structure in the order of 6.6–6.7.