Skip to main content

Volume 52 Supplement 11

Special Issue: Application of GPS and other space geodetic techniques to Earth Sciences (2)

  • Letter
  • Published:

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

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.

References

  • Earthquake Research Institute, Seismic activity in the Izu Peninsula and its vicinity (Nov. 1998–Jan. 1999, Feb. 1999–Apr. 1999), Report on the Coordinating Committee for Earthquake Prediction, 62, 180–184, 184–189, 1999 (in Japanese).

    Google Scholar 

  • Geographical Survey Institute, Crustal movements in the Izu Peninsula and its vicinity, Report on the Coordinating Committee for Earthquake Prediction, 62, 210–223, 1999a (in Japanese).

    Google Scholar 

  • Geographical Survey Institute, Velocities of horizontal crustal deformations of Japan, Report on the Coordinating Committee for Earthquake Prediction, 62, 515–523, 1999b (in Japanese).

    Google Scholar 

  • Hydrographic Department Maritime Safety Agency, Crustal movements in Kozu Island, Report on the Coordinating Committee for Earthquake Prediction, 62, 245–249, 1999 (in Japanese).

    Google Scholar 

  • Kimata, F., M. Satomura, Y. Sasaki, I. Murata, and K. Fuse, GPS measurements in the Tokai region and Izu Hachijo island, Proceedings of the CRCM’93, 225–227, 1994.

    Google Scholar 

  • Kimata, F., S. Kariya, M. Fujita, K. Matsumoto, T. Tabei, J. Segawa, and A. Yamada, Crustal movements in Kozu Island, Izu Islands in southern Central Japan, detected by GPS measurements (July 1996–November 1997), J. Volcanol. Soc. Japan, 44, 13–22, 1999 (in Japanese with English abstract).

    Google Scholar 

  • Kobayashi, S., T. Okuda, F. Kimata, and S. Okubo, Relative gravity changes in Kozu Island (Nov. 1998–July 1999)—Evaluation of the accuracy of SCINTREX auto gravity meter—, Program and Abstracts of 92th Meeting of Geod. Soc. Japan, 79–80, 1999 (in Japanese).

  • Kotake, Y., T. Kato, S. Miyazaki, and A. Sengoku, Relative motion of the Philippine Sea Plate derived from GPS observations and tectonics of the South-Western Japan, J. Seism. Soc. Japan, 51, 171–180, 1998 (in Japanese with English abstract).

    Google Scholar 

  • Mogi, K., Relations between the eruptions of various volcanoes and the deformations of the ground surface around them, Bull. Earthq. Res. Inst. Univ. Tokyo, 36, 99–134, 1958.

    Google Scholar 

  • Polonska, D., M. Harigae, T. Tsuiji, M. Murata, and F. Kimata, Observed vertical motion of Kozu-Jima Island using interferometric GPS, Technical Report of National Aerospace Laboratory TR-1322T, 1–9, 1996.

    Google Scholar 

  • Seno, T., S. Stein, and A. E. Gripp, A Model for the motion of the Philippine Sea plate consistent with NUVEL-1 and Geological data, J. Geophys. Res., 98, 17941–17948, 1993.

    Article  Google Scholar 

  • Tabei, T., J. Segawa, and F. Kimata, GPS measurements on Zenisu-Reef, Chikyu Monthly, 25, 166–170, 1999 (in Japanese).

    Google Scholar 

  • Taniguchi, H., Volcanic geology of Kozu-shima, Japan, J. Volcanol. Soc. Japan, 22, 133–147, 1977 (in Japanese).

    Google Scholar 

Download references

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Fumiaki Kimata.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Kimata, F., Kariya, Si., Fujita, M. et al. Estimated pressure source on Kozu Island volcano, South Central Japan, from GPS measurements (July 1996–August 1999). Earth Planet Sp 52, 975–978 (2000). https://doi.org/10.1186/BF03352315

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1186/BF03352315

Keywords