Estimated pressure source on Kozu Island volcano, South Central Japan, from GPS measurements (July 1996-August 1999)

Although the Kozu Island Volcano, one of the Izu Islands Volcanoes in the s outh part Central Japan, is an active volcano, there is no record of the er uption for about 1100 years since the last eruption in 833 A.D. Since 1988, frequent earthquake swarms are observed around the Kozu Island, and the up lift of 2-4 cm/yr is observed on the island by tidal observations. Station velocities detected by GPS measurements since 1989 show velocities that dif fer from the convergent velocity of the Philippine Sea plate calculated fro m plate motion models. A local GPS network with 12 stations is occupied aro und the volcano, and the GPS measurements are repeated every about six mont h since July 1996. Inflated deformation of 2-4 cm/yr are detected from the GPS measurements and the pressure source is estimated to be located in the northeastern part of the island at a depth of 2.1 km using Mogi solution. N egative gravity changes of more than 30 microgal are also measured above th e pressure source in the period November 1998 to July 1999, consistent with uplift.