The following interactive maps classified
GPS sites by their proximity to InSAR observed human-induced
surface motion or sites that have seasonal motion in their
time-series. Red regions on the maps are where the ground
surface has been sinking for five or more years. Blue patches
are where the ground surface has been rising for 5 or more
years. This classification system allows users to discriminate
sites that contain primarily tectonic signal from those that
have a combination of tectonic and human-induced motions.
For more information see:
Bawden, G.W., et al., Nature, 412, 812-815 (2001)
[Summary][Online
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![link to map of research](https://webarchive.library.unt.edu/eot2008/20090110050420im_/http://quake.wr.usgs.gov/research/deformation/modeling/socal/la/detailmap.gif)
Please click for detailed Southern California maps
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