Coseismic hydrologic response of an alluvial fan to the 1999 Chi-Chi earthquake, Taiwan

Citation
Cy. Wang et al., Coseismic hydrologic response of an alluvial fan to the 1999 Chi-Chi earthquake, Taiwan, GEOLOGY, 29(9), 2001, pp. 831-834
Citations number
21
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Earth Sciences
Journal title
GEOLOGY
ISSN journal
0091-7613 → ACNP
Volume
29
Issue
9
Year of publication
2001
Pages
831 - 834
Database
ISI
SICI code
0091-7613(200109)29:9<831:CHROAA>2.0.ZU;2-3
Abstract
Widespread coseismic change in pore-water pressure across a large alluvial fan in central Taiwan in the 1999 Chi-Chi (M-w = 7.5) earthquake was captur ed for the first time by a dense network of hydrologic monitoring wells. Th e complex, yet systematic, pattern in the water-pressure change appears inc onsistent with the existing models; it requires a model that is based on th e nonlinear mechanical behavior of sediments under earthquake shaking. This paper presents direct field evidence that earthquake shaking causes rising pore pressure in alluvial fans, which in turn may lead to landslides, even on very gentle slopes.