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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


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.


  • Brozena, J. M., The Greenland Aerogeophysics Project: Airborne gravity, topographic and magnetic mapping of an entire continent, Proc. IAG Symposium G3: Determination of the gravity field by space and airborne methods, Vienna, Aug. 1991, Springer-Verlag, New York, NY, 1992.

    Google Scholar 

  • Brozena, J. M., J. LaBrecque, M. Peters, R. Bell, and C. Raymond, Airborne gravity measurement over sea-ice: the Western Weddel Sea, Geophys. Res. Lett., 17, 1941–1944, 1990.

    Article  Google Scholar 

  • Ganeko, Y., Y. Harada, and Y. Komatsu, Gravity measurements at sea in 1976, 1977 and 1978, Data Rep. Hydrogr. Obs., Series of Astro. Geod., 44–50, 1981.

    Google Scholar 

  • Graf, A., Das Seegravimeter, Z. Instrumentenk., 60, 151–162, 1958.

    Google Scholar 

  • Graf, A. and R. Schulze,, J. Geophys. Res., 66, 1813–1821, 1961.

    Article  Google Scholar 

  • Gumert, W. R. and G. E. Cobb, Helicopter gravity measuring system, Proc. of the symp. on dynamic gravimetry, Fort Worth, Texas, 1970.

    Google Scholar 

  • Hammer, S., Airborne gravity is here!, Geophysics, 48, 213–223, 1983.

    Article  Google Scholar 

  • Harlan, R. B., Eötvös correction for airborne gravimetry, J. Geophys. Res., 73, 4675–4679, 1968.

    Article  Google Scholar 

  • Kuroishi, Y., H. Ando, and Y. Fukuda, A new hybrid geoid model for Japan, GSIGEO2000, J. Geodesy, 76, 428–436,.

  • LaCoste, L., Surface ship gravity measurements on the Texas A and M college ship, the Hidalgo, Geophysics, 24, 309–322, 1959.

    Article  Google Scholar 

  • LaCoste, L., N. Clarkson, and G. Hamilton, LaCoste-Romberg stabilized platform ship-board gravity meter, Geophysics, 32, 99–109, 1967a.

    Article  Google Scholar 

  • LaCoste, L., Measurement of gravity at sea and in the air, Rev. Geophysics, 5, 477–526, 1967b.

    Article  Google Scholar 

  • Miyazaki, T., Gravity survey in Kashima-Nada area, Geological Investigation of the Junction area of the Tohoku and Ogasawara Arcs, Cruise Rep., Geological Survey of Japan, No. 19, 87–90, 1984.

    Google Scholar 

  • Sandwell, D. T. and G. Schubert, Geoid height-age relation from SEASAT altimeter profiles across the Mendocino fracture zone, J. Geophys. Res., 87, 3949–3958, 1982.

    Article  Google Scholar 

  • Segawa, J., H. Hasegawa, T. Ishihara, S. Sakuma, and M. Ishii, A preliminary study of the development of a helicopter-mounted gravity measuring system, Bull. Inst. Oceanic Res. and Develop., Tokai Univ., 21, 1–10, 2000a.

    Google Scholar 

  • Segawa, J., S. Kusumoto, E. John Joseph, H. Hasegawa, S. Sekizaki, K. Takada, E. Nakayama, H. Suzuki, T. Ishihara, M. Komazawa, K. Yamamoto, and S. Sakuma, Airborne gravity measurement system by use of a helicopter, J. Geodetic Soc. Japan, 46, 223–229, 2000b.

    Google Scholar 

  • Tomoda, Y. and H. Kanamori, Tokyo surface ship gravity meter α — 1, J. Geodetic Soc. Japan, 7, 116–145, 1962.

    Google Scholar 

  • Thompson, L. G. D., Airborne gravity meter test, J. Geophys. Res., 64, 488–492, 1959.

    Article  Google Scholar 

  • Thompson, L. G. D. and L. J. B. LaCoste, Arial gravity measurements, J. Geophys. Res., 65, 305–322, 1960.

    Article  Google Scholar 

  • Tsuboi, C., Y. Tomoda, and H. Kanamori, Continuous measurement of gravity on board a moving surface ship, Proc. Japan Academy, 37, 571–576, 1961.

    Google Scholar 

  • Vening Meinesz, F. A., Theory and practice of pendulum observations at sea, Publ. Neth. Geod. Comm., Waltman, Delft, 1929.

    Google Scholar 

  • Vening Meinesz, F. A., Theory and practice of pendulum observations at sea, part II, Publ. Neth. Geod. Comm., Waltman, Delft, 1941.

    Google Scholar 

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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).

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Key words

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