Abstract
An RTK-GPS is a candidate for a method of monitoring large ground deformation which is caused by liquefaction during an earthquake or by ground sliding. This paper reports application of the RTK-GPS to measure actual ground deformation in an experiment carried out by PARI. The robustness and the accuracy of the RTK-GPS measurement are studied. It is shown that the RTK-GPS does not have serious problems for the robustness, and that the accuracy of measuring the resultant deformation and the dynamic deformation process is satisfactory. These results support the applicability of the RTK-GPS to the real-time monitoring of large ground deformation.
