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AN INTRODUCTION TO TIME GEOGRAPHY by Nigel Thrift

By Nigel Thrift

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2 Objectives of Geo-scientific and State-geodetic Surveys The benefit of absolute gravimetry has already been exploited in different scientific projects. The International Absolute Gravity Basestation Network (IAGBN) serves, among other purposes, for the determination of large-scale tectonic plate movements (Boedecker and Fritzer 1986; Boedecker and Flury 1995). The recommendations of the Interunion Commission on the Lithosphere on mean sea level and tides propose the regular implementation of absolute gravity measurements at coastal points, 1–10 km away from tide gauges (Carter et al.

An instrumental instability cannot be identified. A similar experience is also gained from the yearly repetition surveys and from the comparisons with the other FG5 absolute gravimeters involved in the Nordic absolute gravity project, to determine the Fennoscandian land uplift, cf. Timmen et al. (2006b) and Bilker-Koivula et al. (2008). 4 Relative Gravimetry The determination of gravity differences and variations requires a composite employment of absolute and relative instrumental techniques and observation methods.

7) With t0 = 0 the following equations are deduced: z = c0 + c1 t + c2 t2 + c3 t3 + · · · , z(t = 0) = c0 ⇒ c0 = z0 , (8) c1 + 2c2 t + 3c3 t2 + · · · , z˙(t = 0) = c1 ⇒ c1 = v0 , (9) z˙ = z¨ = 2c2 + 6c3 t + · · · . (10) Inserting these series in (5) yields 2c2 + 6c3 t + 12c4 t2 + 20c5 t3 + · · · = g0 + γ (c0 + c1 t + c2 t2 + c3 t3 + · · · ) . (11) Comparing the coefficients on the left side of the equation with the right side, the constants are obtained as 1 Absolute and Relative Gravimetry c2 = 1 1 g0 + z0 γ , 2 2 c3 = 9 1 γ v0 , 6 c4 = 1 1 γ g0 + γ 2 z0 , 24 24 ....

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