气候变化领域集成服务门户(CCPortal): The Lithospheric Structure of the Gibraltar Arc System From Wide-Angle Seismic Data

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DOI	10.1029/2020JB019854
	The Lithospheric Structure of the Gibraltar Arc System From Wide-Angle Seismic Data
	Gómez de la Peña L.; Grevemeyer I.; Kopp H.; Díaz J.; Gallart J.; Booth-Rea G.; Gràcia E.; R. Ranero C.
发表日期	2020
ISSN	21699313
卷号	125 期号:9
英文摘要	In continental settings, seismic failure is generally restricted to crustal depth. Crustal structure is therefore an important proxy to evaluate seismic hazard of continental fault systems. Here we present a seismic velocity model across the Gibraltar Arc System, from the Eurasian Betics Range (South Iberian margin), across offshore East Alboran and Pytheas (African margin) basins, and ending onshore in North Morocco. Our results reveal the nature and configuration of the crust supporting the coexistence of three different crustal domains: the continental crust of the Betics, the continental crust of the Pytheas Basin (south Alboran Basin) and onshore Morocco, and a distinct domain formed of magmatic arc crust under the East Alboran Basin. The magmatic arc under the East Alboran Basin is characterized by a velocity structure containing a relatively high-velocity lower crust (~7 km/s) bounded at the top and base by reflections. The lateral extension of this crust is mapped integrating a second perpendicular wide-angle seismic profile along the Eastern Alboran basin, together with basement samples, multibeam bathymetry, and a grid of deep-penetrating multichannel seismic profiles. The transition between crustal domains is currently unrelated to extensional and magmatic processes that formed the basin. The abrupt transition zones between the different crustal domains support that they are bounded by crustal-scale active fault systems that reactivate inherited structures. Seismicity in the area is constrained to upper-middle crust depths, and most earthquakes nucleate outside of the magmatic arc domain. © 2020. The Authors.
英文关键词	active seismic data; active tectonics; crustal structure; Gibraltar Arc System; western Mediterranean
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/187601
作者单位	GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany; Department of Geosciences, Christian-Albrechts-Universität zu Kiel, Kiel, Germany; Institute of Earth Sciences Jaume Almera, CSIC, Barcelona, Spain; Instituto Andaluz de Ciencias de la Tierra, UGR-CSIC, Granada, Spain; Barcelona Center for Subsurface Imaging, Institut de Ciències del Mar, CSIC, Barcelona, Spain; ICREA, Barcelona, Spain
推荐引用方式 GB/T 7714	Gómez de la Peña L.,Grevemeyer I.,Kopp H.,et al. The Lithospheric Structure of the Gibraltar Arc System From Wide-Angle Seismic Data[J],2020,125(9).
APA	Gómez de la Peña L..,Grevemeyer I..,Kopp H..,Díaz J..,Gallart J..,...&R. Ranero C..(2020).The Lithospheric Structure of the Gibraltar Arc System From Wide-Angle Seismic Data.Journal of Geophysical Research: Solid Earth,125(9).
MLA	Gómez de la Peña L.,et al."The Lithospheric Structure of the Gibraltar Arc System From Wide-Angle Seismic Data".Journal of Geophysical Research: Solid Earth 125.9(2020).