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 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 up...

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Published inEarth, planets and space Vol. 52; no. 11; pp. 975 - 978
Main Authors KIMATA, Fumiaki, KARIYA, Shin-Ichi, FUJITA, Masayuki, MATSUMOTO, Kunio, TABEI, Takao, SEGAWA, Jiro, YAMADA, Akiko
Format Conference Proceeding Journal Article
LanguageEnglish
Published Tokyo Terra 01.01.2000
Springer Nature B.V
Subjects
Crystalline rocks
Deformation
Earth sciences
Earth, ocean, space
Earthquakes
Exact sciences and technology
Global positioning systems
GPS
Gravity
Igneous and metamorphic rocks petrology, volcanic processes, magmas
Internal geophysics
Plate motion
Plates (tectonics)
Pressure
Satellite navigation systems
Seismic activity
Solid-earth geophysics, tectonophysics, gravimetry
Uplift
Volcanoes
Izu-shichito
Far East
Honshu
Japan
plate movement
gravity anomalies
vertical movements
Asia
positioning
uplifts
volcanoes
deformation
pressure
velocity
geodetic networks
Global Positioning System
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Summary: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.
ISSN:1343-8832
1880-5981
1880-5981
DOI:10.1186/BF03352315