The North-northwest motion of sites on the eastern half of the figure is attributable to elastic strain accumulation along the Pacific-North America tectonic plate interface.
(The North-northwest motion of sites on the eastern half of the figure; is; attributable to elastic strain accumulation along the Pacific-North America tectonic plate interface)
The North-northwest motion of sites on the eastern half of the figure
is
attributable to elastic strain accumulation along the Pacific-North America tectonic plate interface