气候变化领域集成服务门户(CCPortal): Contemporary stress and strain field in the Mediterranean from stress inversion of focal mechanisms and GPS data

CCPortal

DOI	10.1016/j.tecto.2019.228286
	Contemporary stress and strain field in the Mediterranean from stress inversion of focal mechanisms and GPS data
	Martínez-Garzón P.; Heidbach O.; Bohnhoff M.
发表日期	2020
ISSN	00401951
卷号	774
英文摘要	Mapping the contemporary stress field of the Mediterranean provides fundamental insights on the complexity of plate tectonic forces throughout the region and at different depths. Despite increased data availability and methodological improvements, most recent comprehensive stress field characterization across the entire Mediterranean dates back to 1995. To extend the regional stress information, we use all earthquake focal mechanisms compiled in the World Stress Map database release 2016 for a formal stress inversion. Our main goals are to (1) improve the resolution of the stress field orientation, (2) evaluate the performance of the recently refined stress inversion methodology in a tectonically complex region, (3) test the hypothesis of a depth-dependent stress orientation heterogeneity, and (4) compare different types of stress and strain observations from surface using the GPS-derived information on the strain rate tensor down to the seismogenic crust using summation of normalized seismic potencies. The obtained stress orientations generally capture the main seismotectonic features, including tectonically complex settings such as the Alpine Orogeny or the Ionian Sea. The orientation of the maximum horizontal stress SHmax tends to be uniform with depth within uncertainties while larger stress heterogeneity (quantified by means of the focal mechanism diversity and misfit angles) is found between 5 and 14 km. Both, the orientation of the largest horizontal shortening axis of the strain field from potency tensors, and horizontal strain rate tensor from GPS data are generally sub-parallel to SHmax orientation, indicating a linear stress/strain relationship and that the orientations of the co-seismic release and interseismic strain accumulation are generally consistent. © 2019 Elsevier B.V.
关键词	Earthquake focal mechanisms High resolution stress field orientation mapping Maximum horizontal stress Mediterranean region Plate tectonic forces World stress Map
英文关键词	Global positioning system; Information use; Maps; Seismology; Stress-strain curves; Tensors; Comprehensive stress field; Data availability; Earthquake focal mechanisms; Strain accumulations; Strain rate tensors; Stress and strain; Stress orientations; Stress-field orientation; Strain rate; complexity; focal mechanism; geological mapping; GPS; heterogeneity; performance assessment; plate tectonics; resolution; strain; stress field; Mediterranean Region
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207824
作者单位	Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Telegrafenberg, Potsdam, 14473, Germany; Institute of Geological Sciences, Free University of Berlin, Berlin, Germany
推荐引用方式 GB/T 7714	Martínez-Garzón P.,Heidbach O.,Bohnhoff M.. Contemporary stress and strain field in the Mediterranean from stress inversion of focal mechanisms and GPS data[J],2020,774.
APA	Martínez-Garzón P.,Heidbach O.,&Bohnhoff M..(2020).Contemporary stress and strain field in the Mediterranean from stress inversion of focal mechanisms and GPS data.Tectonophysics,774.
MLA	Martínez-Garzón P.,et al."Contemporary stress and strain field in the Mediterranean from stress inversion of focal mechanisms and GPS data".Tectonophysics 774(2020).