气候变化领域集成服务门户(CCPortal): Galicia Bank sediment transport activity in response to continuous sedimentary instability dynamics: a geotechnical perspective

CCPortal

DOI	10.1007/s00531-019-01776-w
	Galicia Bank sediment transport activity in response to continuous sedimentary instability dynamics: a geotechnical perspective
	Yenes M.; Casas D.; Nespereira J.; Monterrubio S.; Ercilla G.; López-González N.
发表日期	2019
ISSN	14373254
起始页码	2545
结束页码	2560
卷号	108 期号:8
英文摘要	The sedimentary instability dynamics occurring over time throughout the isolated Galicia Bank (Atlantic Ocean, NW Iberian Peninsula) have been studied using a sedimentological and geotechnical approach featuring a quantitative assessment of slope stability under different scenarios, including earthquake activity. The erosion of the scarps in the Galicia Bank includes the continuous development of small instabilities evacuated along gullies and channels or deposited on slopes. These deposits may be subsequently mobilized, evolving into new sedimentary gravity flows (e.g., turbidity flow). The studied sediments consist mostly of poorly to very poorly sorted sands and silts transported by turbidity currents and occasionally by debris flow processes. The sediments in the study area identified as normally consolidated and located on gently sloping areas (gradients less than 5°) may become unstable if low-magnitude seismic events occur (PGA < 0.12). Even under static conditions, they could become unstable if they are located on slopes of > 10° without any trigger other than oversteepening. In contrast, overconsolidated sediments may remain stable under static conditions and may become unstable on slope gradients > 10° when earthquakes occur with the maximum peak ground acceleration (PGA = 0.34). The sedimentological and geotechnical models presented herein are complementary approaches that can be utilized to understand the long-term sedimentary instability dynamics observed within the study area. Such results are critical for better understanding sedimentary models of the dismantling processes of deep seamounts located far away from continental sedimentary inputs. © 2019, Geologische Vereinigung e.V. (GV).
英文关键词	Earthquake; Galicia Bank; Geotechnical properties; Marine sediment strength; Seamount; Slope stability
语种	英语
scopus关键词	earthquake; erosion; geotechnical property; marine sediment; sediment transport; sedimentology; slope stability; turbidity current; Atlantic Ocean; Galicia Bank; Iberian Peninsula
来源期刊	International Journal of Earth Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/147769
作者单位	Departamento de Geología, Facultad de Ciencias, Universidad de Salamanca, Plaza de la Merced s/n, Salamanca, 37008, Spain; Instituto Geológico y Minero de España, 23 Ríos Rosas, Madrid, 28003, Spain; Institut de Ciències del Mar (CSIC), 37-49 Passeig Marítim de la Barceloneta, Barcelona, 08003, Spain; Instituto Español de Oceanografía, Centro Oceanográfico de Málaga, Puerto Pesquero s/n, Málaga, Fuengirola 29640, Spain
推荐引用方式 GB/T 7714	Yenes M.,Casas D.,Nespereira J.,et al. Galicia Bank sediment transport activity in response to continuous sedimentary instability dynamics: a geotechnical perspective[J],2019,108(8).
APA	Yenes M.,Casas D.,Nespereira J.,Monterrubio S.,Ercilla G.,&López-González N..(2019).Galicia Bank sediment transport activity in response to continuous sedimentary instability dynamics: a geotechnical perspective.International Journal of Earth Sciences,108(8).
MLA	Yenes M.,et al."Galicia Bank sediment transport activity in response to continuous sedimentary instability dynamics: a geotechnical perspective".International Journal of Earth Sciences 108.8(2019).