TERRAPUB Earth, Planets and Space

Earth Planets Space, Vol. 52 (No. 11), pp. 975-978, 2000

LETTER

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

Fumiaki Kimata1, Shin-ichi Kariya2, Masayuki Fujita3, Kunio Matsumoto3, Takao Tabei4, Jiro Segawa5, and Akiko Yamada6

1Research Center for Seismology and Volcanology, Graduate School of Science, Nagoya University, Furo, Chikusa, Nagoya 464-8602, Japan
2Earth and Planetary Science, Graduate School of Science, Nagoya University, Furo, Chikusa, Nagoya 464-8602, Japan
3Hydrographic Department, Maritime Safety Agency, 5-3-1 Tukiji, Minato, Tokyo 104-0045, Japan
4Faculty of Science, Kochi University, 2-5-1 Akebono, Kochi 780-8072, Japan
5Faculty of Marine Science and Technology, Tokai University, 3-20-1 Orido, Shimizu 424-0902, Japan
6Geographical Survey Institute, 1 Kitago, Tsukuba 305-0811, Japan

(Received December 31, 1999; Revised August 15, 2000; Accepted August 28, 2000)

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.


Corresponding author E-mail: kimata@seis.nagoya-u.ac.jp


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