Abstract
Simultaneous gravimetric observations of earth tides have been carried out by means of two LaCoste and Romberg gravimeters during the period of about three months from December 1977 to March 1978 at the Aburatsubo Crustal Movement Observatory . Anomalous drift amounting to 30 ?Egal appeared simultaneously in both the gravimeters about one week before the Izu-Oshima Kinkai Earthquake . However, the corre sponding anomalous changes have never been found in oceanic level and crustal inclination data. At the Nokogiriyama Crustal Movement Observatory, gravimetric drift has not appeared at the same time.
