| DOI: | 10.1038/ngeo2683
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| 论文题名: | Rise of the central Andean coast by earthquakes straddling the Moho |
| 作者: | Melnick D.
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| 刊名: | Nature Geoscience
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| ISSN: | 17520894
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| 出版年: | 2016
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| 卷: | 9, 期:5 | | 起始页码: | 401
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| 结束页码: | 407
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| 语种: | 英语
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| Scopus关键词: | coast
; deformation
; earthquake event
; GPS
; landscape evolution
; morphometry
; plate boundary
; Quaternary
; seismic moment
; slip
; subduction zone
; uplift
; Andes
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| 英文摘要: | Surface movements during the largest subduction zone earthquakes commonly drown coastlines. Yet, on geological timescales, coastlines above subduction zones uplift. Here I use a morphometric analysis combined with a numerical model of landscape evolution to estimate uplift rates along the central Andean rasa-a low-relief coastal surface bounded by a steep cliff formed by wave erosion. I find that the rasa has experienced steady uplift of 0.13 ± 0.04 mm per year along a stretch of more than 2,000 km in length, during the Quaternary. These long-term uplift rates do not correlate with Global Positioning System (GPS) measurements of interseismic movements over the decadal scale, which implies that permanent uplift is not predominantly accumulated during the interseismic period. Instead, the rate of rasa uplift correlates with slip during earthquakes straddling the crust-mantle transition, the Moho. Such deeper earthquakes with magnitude 7 to 8 that occurred between 1995 and 2012 resulted in decimetres of coastal uplift. Slip during these earthquakes is located below the locked portion of the plate interface, and therefore may translate into permanent deformation of the overlying plate, where it causes uplift of the coastline. Thus, lower parts of the plate boundary are stably segmented over hundreds to millions of years. I suggest the coastline marks the surface expression of the transition between the shallow, locked seismogenic domain and the deeper, conditionally stable domain where modest earthquakes build up topography. © 2016 Macmillan Publishers Limited. All rights reserved. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/106025
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| Appears in Collections: | 气候减缓与适应
科学计划与规划
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作者单位: | Institut für Erd-und Umweltwissenschaften, Universität Potsdam, Karl-Liebknecht-Strasse 24, Potsdam, Germany
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| Recommended Citation: | |
Melnick D.. Rise of the central Andean coast by earthquakes straddling the Moho[J]. Nature Geoscience,2016-01-01,9(5)
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