Earth, Planets and Space

, Volume 61, Issue 7, pp 933–938 | Cite as

Gravity structure of Akan composite caldera, eastern Hokkaido, Japan: Application of lake water corrections

  • Takeshi Hasegawa
  • Akihiko Yamamoto
  • Hiroyuki Kamiyama
  • Mitsuhiro Nakagawa
Open Access


Akan volcano, eastern Hokkaido, Japan, is characterized by a rectangular-shaped caldera (Akan caldera: 24 km by 13 km) with a complex history of caldera-forming eruptions during the Quaternary. A new Bouguer anomaly map of the caldera is presented on the basis of a gravity survey around Akan volcano. As part of and in addition to this survey, we applied gravimetry over the frozen caldera lake including lake water corrections. The Bouguer map shows the distribution of at least three sub-circular minima indicative of multiple depressions inside the caldera. Lake water corrections, performed by a numerical integration method using rectangular prisms, sharpen edges of the sub-circular minima. This gravity feature is consistent with geological investigations suggesting that caldera-forming eruptions of Akan volcano occurred from at least three different sources. It is concluded that Akan caldera can be described as a composite caldera with three major depressed segments.

Key words

Gravity anomaly Akan volcano composite caldera lake water correction 


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Copyright information

© The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences; TERRAPUB. 2009

Authors and Affiliations

  • Takeshi Hasegawa
    • 1
  • Akihiko Yamamoto
    • 2
  • Hiroyuki Kamiyama
    • 3
  • Mitsuhiro Nakagawa
    • 1
  1. 1.Department of Natural History Sciences, Graduate School of ScienceHokkaido UniversitySapporoJapan
  2. 2.Department of Earth Sciences, Graduate School of Science and EngineeringEhime UniversityMatsuyamaJapan
  3. 3.Institute of Seismology and Volcanology, Graduate School of ScienceHokkaido UniversitySapporoJapan

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