Large riverbed sediment flux sustained for a decade after an earthquake

Gen K. Li (), A. Joshua West, Zhangdong Jin, Hongrui Qiu, Fei Zhang, Jin Wang, Douglas E. Hammond, Alexander L. Densmore, Robert G. Hilton, Sijia Dong, Abra Atwood, Woodward W. Fischer and Michael P. Lamb
Additional contact information
Gen K. Li: University of California
A. Joshua West: University of Southern California
Zhangdong Jin: Chinese Academy of Sciences
Hongrui Qiu: China University of Geosciences
Fei Zhang: Chinese Academy of Sciences
Jin Wang: Chinese Academy of Sciences
Douglas E. Hammond: University of Southern California
Alexander L. Densmore: Durham University
Robert G. Hilton: South Parks Road
Sijia Dong: University of Southern California
Abra Atwood: University of Southern California
Woodward W. Fischer: California Institute of Technology
Michael P. Lamb: California Institute of Technology

Nature, 2025, vol. 644, issue 8076, 398-403

Abstract: Abstract Large earthquakes induce widespread landslides that fill river channels with sediment1,2, generating long-lasting fluvial hazards and reshaping mountain topography. However, riverine sediment fluxes after earthquakes remain poorly resolved, mostly because of a lack of data on bedload flux3,4. Here we construct a source-to-sink sediment budget following the 2008 Mw7.9 (where Mw is the moment magnitude) Wenchuan earthquake in the eastern Tibetan mountains. We measured sediment accumulation in a man-made reservoir downstream of the earthquake-affected region. Ten years after the earthquake, the Min Jiang River had exported about 9% of the sediment mass from earthquake-triggered landslides, with around 5.7 times increase in the total riverine sediment flux sustained over that time. Bedload flux increased by $${27.4}_{-15.6}^{+14.6} \% $$ 27.4 − 15.6 + 14.6 % times compared with pre-earthquake levels, making up $$6{5}_{-26}^{+12} \% $$ 6 5 − 26 + 12 % of the post-earthquake sediment export—a proportion much higher than typical of most mountainous rivers. At the current pace, the river system will remove most Wenchuan landslide debris over centennial timescales. However, future sediment export rates are likely to vary because of changes on hillslopes (for example, revegetation) and in hydrology, sediment characteristics and transport processes. Our findings demonstrate a decadal bedload-dominated sediment pulse driven by earthquake-triggered landslides, suggesting that increased vulnerability to cascading hazards such as aggradation and flooding could persist for decades in populated downstream regions after a large earthquake.

Date: 2025
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DOI: 10.1038/s41586-025-09354-8

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