Spatial and Temporal Changes of Groundwater Level Induced by Thrust Faulting |
| |
| Authors: | Yeeping Chia Jessie J Chiu Yi-Hsuan Chiang Tsai-Ping Lee Chen-Wuing Liu |
| |
| Institution: | (1) Department of Geosciences, National Taiwan University, Taipei, 106, Taiwan;(2) Atomic Energy Council, Yonghe, Taipei, 234, Taiwan;(3) Department of Bioenvironment Systems Engineering, National Taiwan University, Taipei, 106, Taiwan |
| |
| Abstract: | Changes of groundwater level, ranging from a fall of 11.10 m to a rise of 7.42 m, induced by thrust faulting during the 1999
Mw 7.6, Chi-Chi earthquake have been recorded in 276 monitoring wells in Taiwan. Most coseismic falls appeared near the seismogenic
fault as well as other active faults, while coseismic rises prevailed away from the fault. Coseismic groundwater level rises
and falls correlated fairly well with hypocentral distance in the vicinity of the thrust fault. We found a major difference
of coseismic changes in wells of different depths at most multiple-well stations. The recovery process of coseismic groundwater
level changes is associated with the confining condition of the aquifer. Cross-formational flow is likely to play an important
role in groundwater level changes after the earthquake. In the hanging wall of the thrust fault, an abnormal decline of groundwater
level was observed immediately before the earthquake. The underlying mechanism of the unique preseismic change warrants further
investigation. |
| |
| Keywords: | Groundwater Chi-Chi earthquake Thrust fault Coseismic Postseismic Preseismic |
| 本文献已被 SpringerLink 等数据库收录！ |
|
