Abstract
We discuss significance in continuous observation of crustal movement in Japan. One is an earthquake prediction, while the other should be a basic study of solid Earth dynamics. In the first part, we compare merits and demerits of the continuous recording of crustal movement with those of SG and GPS in terms of monitoring of interseismic/preseismic crustal deformation in Japan. In the remaining part, we compare running spectra of the continuous recording of crustal movement at four stations in Japan after the 2004 Sumatra-Andaman earthquake, showing that they record signals of free oscillations of an order of 10-10 strains at periods from thousand second to hours. We conclude that the continuous recording of crustal movement should be a powerful tool for studies both in earthquake prediction and solid Earth dynamics.
