As part of the geodetic monitoring program at Mount St. Helens,
CVO established a trilateration network to monitor far field
deformation of the volcano. The networks are: the "far out net"
(blue lines) and the "outer net" (red lines). Both were established
in 1980. The "far out net" has been remeasured several times since
1980 and shows changes within measurement errors. The "outer net"
has been measured frequently until 1985, then sporadically until 1993,
when the network was measured with GPS (global positioning system).
Red colored names are instrument stations for the "outer net".
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