Earthquake-triggered increase in sediment delivery from an active mountain belt

Simon J. Dadson; Niels Hovius; Hongey Chen; W. Brian Dade; Jiun Chuan Lin; Mei Ling Hsu; Ching Weei Lin; Ming Jame Horng; Tien Chien Chen; John Milliman; Colin P. Stark

doi:10.1130/G20639.1

Earthquake-triggered increase in sediment delivery from an active mountain belt

Simon J. Dadson, Niels Hovius, Hongey Chen, W. Brian Dade, Jiun Chuan Lin, Mei Ling Hsu, Ching Weei Lin, Ming Jame Horng, Tien Chien Chen, John Milliman, Colin P. Stark

Department of Earth Sciences

Research output: Contribution to journal › Article › peer-review

463 Citations (Scopus)

Abstract

In tectonically active mountain belts, earthquake-triggered landslides deliver large amounts of sediment to rivers. We quantify the geomorphic impact of the 1999 M_w 7.6 Chi-Chi earthquake in Taiwan, which triggered >20,000 landslides. Coseismic weakening of substrate material caused increased landsliding during subsequent typhoons. Most coseismic landslides remained confined to hillslopes. Downslope transport of sediment into the channel network occurred during later storms. The sequential processes have led to a factor-of-four increase in unit sediment concentration in rivers draining the epicentral area and increased the magnitude and frequency of hyperpycnal sediment delivery to the ocean. Four years after the earthquake, rates of hillslope mass wasting remain elevated in the epicentral area.

Original language	English
Pages (from-to)	733-736
Number of pages	4
Journal	Geology
Volume	32
Issue number	8
DOIs	https://doi.org/10.1130/G20639.1
Publication status	Published - 2004 Aug

All Science Journal Classification (ASJC) codes

Geology

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10.1130/G20639.1

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title = "Earthquake-triggered increase in sediment delivery from an active mountain belt",

abstract = "In tectonically active mountain belts, earthquake-triggered landslides deliver large amounts of sediment to rivers. We quantify the geomorphic impact of the 1999 Mw 7.6 Chi-Chi earthquake in Taiwan, which triggered >20,000 landslides. Coseismic weakening of substrate material caused increased landsliding during subsequent typhoons. Most coseismic landslides remained confined to hillslopes. Downslope transport of sediment into the channel network occurred during later storms. The sequential processes have led to a factor-of-four increase in unit sediment concentration in rivers draining the epicentral area and increased the magnitude and frequency of hyperpycnal sediment delivery to the ocean. Four years after the earthquake, rates of hillslope mass wasting remain elevated in the epicentral area.",

author = "Dadson, {Simon J.} and Niels Hovius and Hongey Chen and Dade, {W. Brian} and Lin, {Jiun Chuan} and Hsu, {Mei Ling} and Lin, {Ching Weei} and Horng, {Ming Jame} and Chen, {Tien Chien} and John Milliman and Stark, {Colin P.}",

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T1 - Earthquake-triggered increase in sediment delivery from an active mountain belt

AU - Dadson, Simon J.

AU - Hovius, Niels

AU - Chen, Hongey

AU - Dade, W. Brian

AU - Lin, Jiun Chuan

AU - Hsu, Mei Ling

AU - Lin, Ching Weei

AU - Horng, Ming Jame

AU - Chen, Tien Chien

AU - Milliman, John

AU - Stark, Colin P.

PY - 2004/8

Y1 - 2004/8

N2 - In tectonically active mountain belts, earthquake-triggered landslides deliver large amounts of sediment to rivers. We quantify the geomorphic impact of the 1999 Mw 7.6 Chi-Chi earthquake in Taiwan, which triggered >20,000 landslides. Coseismic weakening of substrate material caused increased landsliding during subsequent typhoons. Most coseismic landslides remained confined to hillslopes. Downslope transport of sediment into the channel network occurred during later storms. The sequential processes have led to a factor-of-four increase in unit sediment concentration in rivers draining the epicentral area and increased the magnitude and frequency of hyperpycnal sediment delivery to the ocean. Four years after the earthquake, rates of hillslope mass wasting remain elevated in the epicentral area.

AB - In tectonically active mountain belts, earthquake-triggered landslides deliver large amounts of sediment to rivers. We quantify the geomorphic impact of the 1999 Mw 7.6 Chi-Chi earthquake in Taiwan, which triggered >20,000 landslides. Coseismic weakening of substrate material caused increased landsliding during subsequent typhoons. Most coseismic landslides remained confined to hillslopes. Downslope transport of sediment into the channel network occurred during later storms. The sequential processes have led to a factor-of-four increase in unit sediment concentration in rivers draining the epicentral area and increased the magnitude and frequency of hyperpycnal sediment delivery to the ocean. Four years after the earthquake, rates of hillslope mass wasting remain elevated in the epicentral area.

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JO - Geology

JF - Geology

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ER -

Earthquake-triggered increase in sediment delivery from an active mountain belt

Abstract

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