Open Access

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

  • Fumiaki Kimata1Email author,
  • Shin-ichi Kariya2,
  • Masayuki Fujita3,
  • Kunio Matsumoto3,
  • Takao Tabei4,
  • Jiro Segawa5 and
  • Akiko Yamada6
Earth, Planets and Space201452:BF03352315

https://doi.org/10.1186/BF03352315

Received: 31 December 1999

Accepted: 28 August 2000

Published: 24 June 2014

Abstract

Although the Kozu Island Volcano, one of the Izu Islands Volcanoes in the south part Central Japan, is an active volcano, there is no record of the eruption 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 uplift of 2–4 cm/yr is observed on the island by tidal observations. Station velocities detected by GPS measurements since 1989 show velocities that differ from the convergent velocity of the Philippine Sea plate calculated from plate motion models. A local GPS network with 12 stations is occupied around the volcano, and the GPS measurements are repeated every about six month 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. Negative gravity changes of more than 30 microgal are also measured above the pressure source in the period November 1998 to July 1999, consistent with uplift.