(mm/yr) (mm/yr) (mm/yr)
(mm/yr) (mm/yr) (mm/yr)
(mm/yr) (mm/yr) (mm/yr)
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Collocation observation of GPS and gravity<br />
• By collocating the position and gravity measurements.<br />
we have an opportunity to discuss the elastic and<br />
viscous problems separately (Wahr(<br />
et al. . ,1995)<br />
Key numbers;<br />
+6.5 <strong>mm</strong>/μGal<br />
Gal: : a ratio of the viscous displacement<br />
to the viscous gravity change due to<br />
the mass redistribution in the mantle.<br />
-0.3<br />
μGal/<strong>mm</strong>: Free-air gravity change<br />
-0.15<br />
μGal/<strong>mm</strong><br />
(i.e. -0.3+1/6.5):<br />
viscous gravity rate
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