Paleoseismology of silent faults in the Central Apennines (Italy): the Mt. Vettore and Laga Mts. faults
Paleoseismology of silent faults in the Central Apennines (Italy): the Mt. Vettore and Laga Mts. faults
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亚平宁山脉中部（意大利）无声断层的古地震学：维托尔山和拉加山。
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
P. Galli
中科院分区：
文献类型：
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作者：
F. Galadini;P. Galli
在亚平宁山脉中部沿着断层进行了古地震学分析，显示出晚第四纪活动的地貌证据，其特征是没有历史地震活动。沿着这座山挖了三条战壕。Vettore断层，穿过晚更新世-全新世冲积扇上的陡崖。最年轻的位移事件（E1）发生在距今4155-3965年之后，公元6 - 7世纪之前，既往事件（E2）发生在5940-5890/5795-5780年BP和4155-3965年BP之间，而最早事件（E3）发生在18.000-12.000年BP和5940-5890/5795-5780年BP之间。一条沟渠被挖掘穿过拉加山脉。该断层为8320-8150年BP后的两次位移事件提供了证据。通过古地震学分析，估算了该地区最小垂直滑动速率。Vettore断层的滑动速率为0.11-0.36 mm/年，而沿Laga山脉的最小滑动速率为沿着。故障为0.12 mm/年。从古地震学上推断，该地区的地震重现期不超过4690年。Vettore断层和不超过7570年的拉加山脉。故障，而对于这两个故障，自上次激活以来的最小经过时间分别为1300年和800年。前者的评估是基于古地震学数据，而后者的估计是基于历史上没有可能由拉加山脉引起的地震。错误和过去八个世纪大规模事件历史目录的完整性。根据地表断层的长度，预计M6.5和6.6级地震可能来自Mt的活化。Vettore和Laga山脉分别的缺点。
Paleoseismological analyses have been performed in the Central Apennines along faults showing geomorphological evidence of Late Quaternary activity and characterised by the absence of historical seismicity. Three trenches were made along the Mt. Vettore Fault, across a scarp on a Late Pleistocene-Holocene alluvial fan. The youngest displacement event (E1) occurred after 4155-3965 years BP and before the 6th-7th century A.D., a previous event (E2) occurred between 5940-5890/5795-5780 years BP and 4155-3965 years BP, while the oldest event (E3) occurred between 18.000-12.000 years BP and 5940-5890/5795-5780 years BP. One trench was excavated across the Laga Mts. Fault which gave evidence for two displacement events after 8320-8150 years BP. The minimum vertical slip rate estimated through the paleoseismological analysis of the Mt. Vettore Fault is 0.11-0.36 mm/yr, while the minimum slip rate along the Laga Mts. Fault is 0.12 mm/yr. The paleoseismologically inferred recurrence interval is not longer than 4690 years for the Mt. Vettore Fault and not longer than 7570 years for the Laga Mts. Fault, while the minimum elapsed times since the last activation are 1300 and 800 years for the two faults, respectively. The evaluation of the former elapsed time was based on paleoseismological data, while the estimation of the latter was based on the absence of historical earthquakes which may have been caused by the Laga Mts. Fault and on the completeness of the historical catalogues for the large magnitude events in the last eight centuries. Based on the length of the fault at the surface, earthquakes with M 6.5 and 6.6 may be expected from the activation of the Mt. Vettore and Laga Mts. faults, respectively.