气候变化领域集成服务门户(CCPortal): Fine-scale structure of the 2016–2017 central Italy seismic sequence from data recorded at the Italian national network

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DOI	10.1029/2019JB018440
	Fine-scale structure of the 2016–2017 central Italy seismic sequence from data recorded at the Italian national network
	Michele M.; Chiaraluce L.; Di Stefano R.; Waldhauser F.
发表日期	2020
ISSN	21699313
起始页码	1
结束页码	26
卷号	125 期号:4
英文摘要	We explore the three-dimensional structure of the 2016–2017 Central Italy sequence using ~34,000 ML ≥ 1.5 earthquakes that occurred between August 2016 and January 2018. We applied cross-correlation and double-difference location methods to waveform and parametric data routinely produced at the Italian National Institute of Geophysics and Volcanology. The sequence activated an 80 km long system of normal faults and near-horizontal detachment faults through the MW 6.0 Amatrice, the MW 5.9 Visso, and the MW 6.5 Norcia mainshocks and aftershocks. The system has an average strike of N155°E and dips 38°–55° southwestward and is segmented into 15–30 km long faults individually activated by the cascade of MW ≥ 5.0 shocks. The two main normal fault segments, Mt. Vettore-Mt. Bove to the North and Mt. della Laga to the South, are separated by an NNE-SSW-trending lateral ramp of the Sibillini thrust, a regional structure inherited from the previous compressional tectonic phase putting into contact diverse lithologies with different seismicity patterns. Space-time reconstruction of the fault system supports a composite rupture scenario previously proposed for the MW 6.5 Norcia earthquake, where the rupture possibly propagated also along an oblique portion of the Sibillini thrust. This dissected set of normal fault segments is bounded at 8–10 km depth by a continuous 2 km thick seismicity layer of extensional nature slightly dipping eastward and interpreted as a shear zone. All three mainshocks in the sequence nucleated along the high-angle planes at significant distance from the shear zone, thus complicating the interpretation of the mechanisms driving strain partitioning between these structures. © 2020. American Geophysical Union. All Rights Reserved.
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/188016
作者单位	Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy; Lamont-Doherty Earth Observatory, Columbia University, New York, NY, United States
推荐引用方式 GB/T 7714	Michele M.,Chiaraluce L.,Di Stefano R.,等. Fine-scale structure of the 2016–2017 central Italy seismic sequence from data recorded at the Italian national network[J],2020,125(4).
APA	Michele M.,Chiaraluce L.,Di Stefano R.,&Waldhauser F..(2020).Fine-scale structure of the 2016–2017 central Italy seismic sequence from data recorded at the Italian national network.Journal of Geophysical Research: Solid Earth,125(4).
MLA	Michele M.,et al."Fine-scale structure of the 2016–2017 central Italy seismic sequence from data recorded at the Italian national network".Journal of Geophysical Research: Solid Earth 125.4(2020).