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月球激光测距站地心位置的缓慢变化包括局部和区域性地壳变形和板块运动所引起的成分。大地测量和地球物理方法看来是测定局部和区域性效应的最及时和最经济的方法。夏威夷大学期望执行一项综合的测地-地球物理计划以支持其1976年中期的月球测距计划。测量包括(a)茅伊岛及其邻近岛屿上的选用点之间的反复的大地测量,(b)依靠海潮标在岛上反复进行水准测量,(c)用倾斜计监视局部垂直线的变化,(d)重力地潮测量和(e)地壳活动的地震监视。得克萨斯大学也正在进行一项相似的计划,以支持他们的麦克唐纳天文台月球测距计划。
Slow changes in the geocentric position of the lunar laser ranging station include those caused by local and regional crustal deformation and plate movement. Geodetic and geophysical methods appear to be the most timely and cost-effective method of determining local and regional effects. The University of Hawaii looks forward to implementing an integrated geodetic-geophysical program to support its mid-1976 lunar range project. The measurements include (a) repeated geodetic surveys between selected points on the island of Maei and its adjacent islands, (b) repetitive leveling measurements on the island by means of a tide gauge, (c) monitoring of changes in local vertical lines with a tachometer , (d) gravity tide measurements and (e) seismic monitoring of crustal activity. The University of Texas is also conducting a similar project to support their MacDonald Observatory lunar rangefinder program.