Role of S waves and Love waves in coseismic permeability enhancement

The 2008 M7.9 Wenchuan earthquake in Sichuan, China, caused water level to oscillate and undergo sustained changes in Taiwan, ∼2000 km away from the epicenter. Here we use the responses in three wells recorded at high sampling rate (1 Hz) and the broadband seismograms from a nearby station to docume...

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Bibliographic Details
Published in:Geophysical research letters 2009-05, Vol.36 (9), p.np-n/a
Main Authors: Wang, Chi-yuen, Chia, Yeeping, Wang, Pei-ling, Dreger, Douglas
Format: Article
Language:English
Subjects:
Broadband
Chemicals
Earth sciences
Earth, ocean, space
Earthquakes
Exact sciences and technology
Ground-water flow
Groundwater
Groundwater flow
groundwater level
Hydrology
Love waves
Oscillations
Permeability
Physical properties
S waves
Sampling
Seismic activity
Seismic phenomena
Seismology
Water levels
Wenchuan earthquake
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Summary:The 2008 M7.9 Wenchuan earthquake in Sichuan, China, caused water level to oscillate and undergo sustained changes in Taiwan, ∼2000 km away from the epicenter. Here we use the responses in three wells recorded at high sampling rate (1 Hz) and the broadband seismograms from a nearby station to document, for the first time, that the major water‐level responses associated with Rayleigh waves were preceded by small oscillations that occurred concurrently with S waves and Love waves. We also show that the groundwater flow associated with these small oscillations may be strong enough to remove blockades from sediment pores to enhance aquifer permeability and to facilitate the later major responses.
ISSN:0094-8276
1944-8007
DOI:10.1029/2009GL037330