Scopus记录号: 2-s2.0-85062635700
论文题名: Increased landslide activity on forested hillslopes following two recent volcanic eruptions in Chile
作者: Korup O. ; Seidemann J. ; Mohr C.H.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2019
语种: 英语
英文摘要: Large explosive eruptions can bury landscapes beneath thick layers of tephra. Rivers subsequently overloaded with excess pyroclastic sediments have some of the highest reported specific sediment yields. Much less is known about how hillslopes respond to tephra loads. Here, we report a pulsed and distinctly delayed increase in landslide activity following the eruptions of the Chaitén (2008) and Puyehue–Cordón Caulle (2011) volcanoes in southern Chile. Remote-sensing data reveal that landslides clustered in densely forested hillslopes mostly two to six years after being covered by tephra. This lagged instability is consistent with a gradual loss of shear strength of decaying tree roots in areas of high tephra loads. Surrounding areas with comparable topography, forest cover, rainfall and lithology maintained landslide rates roughly ten times lower. The landslides eroded the landscape by up to 4.8 mm on average within 30 km of both volcanoes, mobilizing up to 1.6 MtC at rates of about 265 tC km –2 yr –1 . We suggest that these yields may reinforce the elevated river loads of sediment and organic carbon in the decade after the eruptions. We recommend that studies of post-eruptive mass fluxes and hazards include lagged landslide responses of tephra-covered forested hillslopes, to avoid substantial underestimates. © 2019, The Author(s), under exclusive licence to Springer Nature Limited. 资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122618
Appears in Collections: 气候变化事实与影响
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作者单位: Institute of Environmental Science and Geography, University of Potsdam, Potsdam, Germany; Institute of Geosciences, University of Potsdam, Potsdam, Germany
Recommended Citation:
Korup O.,Seidemann J.,Mohr C.H.. Increased landslide activity on forested hillslopes following two recent volcanic eruptions in Chile[J]. Nature Geoscience,2019-01-01