Open AccessEarthquake-triggered increase in sediment delivery from an active mountain belt
Author(s) -
Simon Dadson,
Niels Hovius,
Hongey Chen,
W. Brian Dade,
JiunChuan Lin,
Mei-Ling Hsu,
Ching-Weei Lin,
MingJame Horng,
Tien-Chien Chen,
John D. Milliman,
C. P. Stark
Publication year - 2004
Publication title -
geology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.609
H-Index - 215
eISSN - 1943-2682
pISSN - 0091-7613
DOI - 10.1130/g20639.1
Subject(s) - china , christian ministry , history , geography , library science , archaeology , political science , law , computer science
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. \u
Accelerating Research
Robert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom
Address
John Eccles HouseRobert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom