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Volume 57 Supplement 4

Special Issue: Special Section for the 2004 off the Kii peninsula earthquakes (2)

Examination of consistency of marine gravity with land gravity in and around the Japanese Islands using a helicopter-borne gravimeter

Earth, Planets and Space volume 57, pages 243–252 (2005)Cite this article

Abstract

This paper reports a finding that marine gravity data around the Japanese Islands are inconsistent with nearby land gravity data. The comparison between land and marine gravity was made possible by the gravity measurements from the air using a helicopter-borne gravimeter (SEGAWA Model) developed by the present authors. The ground/sea truth gravity anomaly can be checked against the gravity from the air, though it is not free air gravity anomaly but gravity disturbance. The newly-developed airborne gravimeter first manufactured in 1998 shows a good performance with a 1–2 mgal average repeatability of measurement under a 90-knot flight speed. Thus we have found disagreements between ground truth and sea truth gravity anomalies on the basis of airborne gravity data in the areas in Japan where we have so far made measurements. Among them we will report the case in the area from Saitama and Ibaraki offshore to the Kashima-Nada Sea, p]Japan. Our conclusion about this area is that the past marine gravity data obtained by surface ship gravimeters involve systematic errors of more than 10 mgals. This kind of inconsistency between marine and land gravity is expected to be found in a number of other areas around the Japanese Islands.

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Authors and Affiliations

  1. School of Marine Science and Technology, Tokai University, 3-20-1 Shimizu-Orido, Shizuoka, 424-8610, Japan

    Jiro Segawa, K. Vijay Kumar & Shigekazu Kusumoto

  2. Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, 1-1-1 C#7 Higashi, Tsukuba, Ibaraki, 305-8567, Japan

    Masao Komazawa

  3. AeroGRAV, 1-44-5-206 Bessho, Hachioji, Tokyo, 192-0363, Japan

    Eiji Nakayama

  4. Geology and Geophysics, School of Earth and Environmental Sciences, the University of Adelaide, SA, 5005, Australia

    E. John Joseph

  5. Hydrographic and Oceanographic Department, Japan Coast Guard, 5-3-1 Tsukiji, Chuo-ku, Tokyo, 104-0045, Japan

    Ken-ei Onodera

  6. Geographical Survey Institute, 1 Kitasato, Tsukuba, Ibaraki, 305-0811, Japan

    Yuki Kuroishi

Authors
  1. Jiro Segawa
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  2. Masao Komazawa
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  3. K. Vijay Kumar
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  4. Eiji Nakayama
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  5. E. John Joseph
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  6. Shigekazu Kusumoto
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  7. Ken-ei Onodera
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  8. Yuki Kuroishi
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Corresponding author

Correspondence to Jiro Segawa.

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Segawa, J., Komazawa, M., Kumar, K.V. et al. Examination of consistency of marine gravity with land gravity in and around the Japanese Islands using a helicopter-borne gravimeter. Earth Planet Sp 57, 243–252 (2005). https://doi.org/10.1186/BF03352560

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  • DOI: https://doi.org/10.1186/BF03352560

Key words

  • Inconsistency between marine and land gravity
  • helicopter-borne gravimeter