Hydrostatic Level System for Slow Ground Motion Studies at Fermilab and Slac

A series of new ground motion studies using an upgraded hydrostatic level system are planned at Fermilab and SLAC in collaboration with BINP. To better characterize both the spatial and temporal characteristics of slow ground motion, these studies will use large number of probes and will also be performed in several geologically different locations. The hydrostatic level system used in ongoing measurements near Fermilab [1] suffers from uncertainty of temperature fluctuation effects. This paper presents improvements to be incorporated into the upgraded hydrostatic level system, present status, and the plan for experimental studies.