Physics
Scientific paper
Jun 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3512402w&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 12, CiteID L12402
Physics
3
Physical Properties Of Rocks: Permeability And Porosity, Hydrology: Groundwater Transport, Hydrology: Rocks: Physical Properties, Physical Properties Of Rocks: Transport Properties
Scientific paper
Using a new empirical relation among earthquake magnitude, seismic energy density and hypocentral distance, we show that the documented water level changes during earthquakes occur across seven orders of magnitude of seismic energy density. Combining this relation with a global data set for water level changes, new data from Taiwan, and laboratory data for saturated sediments under cyclic loading, we show that at least two mechanisms may be important for inducing water level changes. Undrained volumetric change may be the dominant mechanism to cause the abrupt decrease or increase of water level documented in the near field, while an earthquake-enhanced permeability may account for the more gradual and sustained water level changes documented in the intermediate field.
Chia Yeeping
Wang Chi-yuen
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