Abstract
GEOPHYSICAL RESEARCH LETTERS, VOL. 39, L01301, 4 PP., 2012
doi:10.1029/2011GL050195
Correlation between changes in groundwater levels and surface deformation from GPS measurements in the San Gabriel Valley, California
Correlation between changes in groundwater levels and surface deformation from GPS measurements in the San Gabriel Valley, California
Key Points- Surface deformation and groundwater level changes are highly correlated
- Principal axes allow heterogeneity and anisotropy of surface deformation field
- The projection method can be a real-time monitoring system for deformation
Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology,, Cambridge, Massachusetts,, USA
Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology,, Cambridge, Massachusetts,, USA
Changes in groundwater levels cause water-bearing basins to deform. Here we provide a detailed history of horizontal surface displacements in the San Gabriel Valley, California, which we show are highly correlated with the water level changes measured at a nearby well: correlation coefficient of 0.96 ? 0.01. We use the surface response from a one year period during which water level change in the nearby well was over 16?m, to monitor the deformations over a 14?year period from 1998 to 2011. The water level changes lead surface deformation by 21?days, but the significance of the offset is only weakly supported (p-value = 0.129). The projection method can be used as a real-time monitoring or detection system for deformation caused by a variety of mechanisms such as fluid injection and removal (groundwater development, oil production, carbon sequestration), and by seismic and volcanic activity.
/journals/gl/gl1201/2011GL050195/
Received 30 October 2011; accepted 30 November 2011; published 5 January 2012.
Citation: (2012), Correlation between changes in groundwater levels and surface deformation from GPS measurements in the San Gabriel Valley, California, Geophys. Res. Lett., 39, L01301, doi:10.1029/2011GL050195.
Source: http://dx.doi.org/10.1029/2011GL050195
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