TY - JOUR AU - Judah Levine AU - C. Meertens AU - Robert Busby BT - Journal of Geophysical Research DA - Jan-01-1989 DO - 10.1029/JB094iB01p00574 PY - 1989 EP - 574 T2 - Journal of Geophysical Research TI - Tilt observations using borehole tiltmeters: 1. Analysis of tidal and secular tilt VL - 94 SN - 0148-0227 ER -